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Endoglin mutants retained in the endoplasmic reticulum exacerbate loss of function in hereditary hemorrhagic telangiectasia type 1 (HHT1) by exerting dominant negative effects on the wild type allele 保留在内质网中的内胚层蛋白突变体通过对野生型等位基因产生显性负效应而加剧遗传性出血性毛细血管扩张症1型(HHT1)的功能丧失
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-16 DOI: 10.1111/tra.12928
Nesrin Gariballa, Sally Badawi, Bassam R. Ali
{"title":"Endoglin mutants retained in the endoplasmic reticulum exacerbate loss of function in hereditary hemorrhagic telangiectasia type 1 (HHT1) by exerting dominant negative effects on the wild type allele","authors":"Nesrin Gariballa, Sally Badawi, Bassam R. Ali","doi":"10.1111/tra.12928","DOIUrl":"https://doi.org/10.1111/tra.12928","url":null,"abstract":"Hereditary hemorrhagic telangiectasia (HHT) is an autosomal dominant disorder affecting 1 in 5000–8000 individuals. Hereditary hemorrhagic telangiectasia type 1 (HHT1) is the most common HHT and manifests as diverse vascular malformations ranging from mild symptoms such as epistaxis and mucosal and cutaneous telangiectases to severe arteriovenous malformations (AVMs) in the lungs, brain or liver. HHT1 is caused by heterozygous mutations in the <i>ENG</i> gene, which encodes endoglin, the TGFβ homodimeric co-receptor. It was previously shown that some endoglin HHT1-causing variants failed to traffic to the plasma membrane due to their retention in the endoplasmic reticulum (ER) and consequent degradation by ER-associated degradation (ERAD). Endoglin is a homodimer formed in the ER, and we therefore hypothesized that mixed heterodimers might form between ER-retained variants and WT protein, thus hampering its maturation and trafficking to the plasma membrane causing dominant negative effects. Indeed, HA-tagged ER-retained mutants formed heterodimers with Myc-tagged WT endoglin. Moreover, variants L32R, V105D, P165L, I271N and C363Y adversely affected the trafficking of WT endoglin by reducing its maturation and plasma membrane localization. These results strongly suggest dominant negative effects exerted by these ER-retained variants aggravating endoglin loss of function in patients expressing them in the heterozygous state with the WT allele. Moreover, this study may help explain some of the variability observed among HHT1 patients due to the additional loss of function exerted by the dominant negative effects in addition to that due to haploinsufficiency. These findings might also have implications for some of the many conditions impacted by ERAD.","PeriodicalId":23207,"journal":{"name":"Traffic","volume":"43 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139483212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Glucocorticoids rescue cell surface trafficking of R451C Neuroligin3 and enhance synapse formation 糖皮质激素可挽救 R451C Neuroligin3 的细胞表面贩运并增强突触的形成
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-14 DOI: 10.1111/tra.12930
Tamara Diamanti, Laura Trobiani, Lorenza Mautone, Federica Serafini, Roberta Gioia, Laura Ferrucci, Clotilde Lauro, Sara Bianchi, Camilla Perfetto, Stefano Guglielmo, Raimondo Sollazzo, Ezio Giorda, Andrea Setini, Davide Ragozzino, Elena Miranda, Davide Comoletti, Silvia Di Angelantonio, Emanuele Cacci, Antonella De Jaco
{"title":"Glucocorticoids rescue cell surface trafficking of R451C Neuroligin3 and enhance synapse formation","authors":"Tamara Diamanti, Laura Trobiani, Lorenza Mautone, Federica Serafini, Roberta Gioia, Laura Ferrucci, Clotilde Lauro, Sara Bianchi, Camilla Perfetto, Stefano Guglielmo, Raimondo Sollazzo, Ezio Giorda, Andrea Setini, Davide Ragozzino, Elena Miranda, Davide Comoletti, Silvia Di Angelantonio, Emanuele Cacci, Antonella De Jaco","doi":"10.1111/tra.12930","DOIUrl":"https://doi.org/10.1111/tra.12930","url":null,"abstract":"Neuroligins are synaptic cell adhesion proteins with a role in synaptic function, implicated in neurodevelopmental disorders. The autism spectrum disorder-associated substitution Arg451Cys (R451C) in NLGN3 promotes a partial misfolding of the extracellular domain of the protein leading to retention in the endoplasmic reticulum (ER) and the induction of the unfolded protein response (UPR). The reduced trafficking of R451C NLGN3 to the cell surface leads to altered synaptic function and social behavior. A screening in HEK-293 cells overexpressing NLGN3 of 2662 compounds (FDA-approved small molecule drug library), led to the identification of several glucocorticoids such as alclometasone dipropionate, desonide, prednisolone sodium phosphate, and dexamethasone (DEX), with the ability to favor the exit of full-length R451C NLGN3 from the ER. DEX improved the stability of R451C NLGN3 and trafficking to the cell surface, reduced the activation of the UPR, and increased the formation of artificial synapses between HEK-293 and hippocampal primary neurons. The effect of DEX was validated on a novel model system represented by neural stem progenitor cells and differentiated neurons derived from the R451C NLGN3 knock-in mouse, expressing the endogenous protein. This work shows a potential rescue strategy for an autism-linked mutation affecting cell surface trafficking of a synaptic protein.","PeriodicalId":23207,"journal":{"name":"Traffic","volume":"51 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rescue of secretion of rare-disease-associated misfolded mutant glycoproteins in UGGT1 knock-out mammalian cells 在 UGGT1 基因被敲除的哺乳动物细胞中挽救与罕见疾病相关的错误折叠突变糖蛋白的分泌
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-14 DOI: 10.1111/tra.12927
Gabor Tax, Kevin P. Guay, Ludovica Pantalone, Martina Ceci, Tatiana Soldà, Charlie J. Hitchman, Johan C. Hill, Snežana Vasiljević, Andrea Lia, Carlos P. Modenutti, Kees R. Straatman, Angelo Santino, Maurizio Molinari, Nicole Zitzmann, Daniel N. Hebert, Pietro Roversi, Marco Trerotola
{"title":"Rescue of secretion of rare-disease-associated misfolded mutant glycoproteins in UGGT1 knock-out mammalian cells","authors":"Gabor Tax, Kevin P. Guay, Ludovica Pantalone, Martina Ceci, Tatiana Soldà, Charlie J. Hitchman, Johan C. Hill, Snežana Vasiljević, Andrea Lia, Carlos P. Modenutti, Kees R. Straatman, Angelo Santino, Maurizio Molinari, Nicole Zitzmann, Daniel N. Hebert, Pietro Roversi, Marco Trerotola","doi":"10.1111/tra.12927","DOIUrl":"https://doi.org/10.1111/tra.12927","url":null,"abstract":"Endoplasmic reticulum (ER) retention of misfolded glycoproteins is mediated by the ER-localized eukaryotic glycoprotein secretion checkpoint, UDP-glucose glycoprotein glucosyl-transferase (UGGT). The enzyme recognizes a misfolded glycoprotein and flags it for ER retention by re-glucosylating one of its <i>N</i>-linked glycans. In the background of a congenital mutation in a secreted glycoprotein gene, UGGT-mediated ER retention can cause rare disease, even if the mutant glycoprotein retains activity (“responsive mutant”). Using confocal laser scanning microscopy, we investigated here the subcellular localization of the human Trop-2-Q118E, E227K and L186P mutants, which cause gelatinous drop-like corneal dystrophy (GDLD). Compared with the wild-type Trop-2, which is correctly localized at the plasma membrane, these Trop-2 mutants are retained in the ER. We studied fluorescent chimeras of the Trop-2 Q118E, E227K and L186P mutants in mammalian cells harboring CRISPR/Cas9-mediated inhibition of the <i>UGGT1</i> and/or <i>UGGT2</i> genes. The membrane localization of the Trop-2 Q118E, E227K and L186P mutants was successfully rescued in <i>UGGT1</i><sup><i>−/−</i></sup>cells. UGGT1 also efficiently reglucosylated Trop-2-Q118E-EYFP <i>in cellula</i>. The study supports the hypothesis that UGGT1 modulation would constitute a novel therapeutic strategy for the treatment of pathological conditions associated to misfolded membrane glycoproteins (whenever the mutation impairs but does not abrogate function), and it encourages the testing of modulators of ER glycoprotein folding quality control as broad-spectrum rescue-of-secretion drugs in rare diseases caused by responsive secreted glycoprotein mutants.","PeriodicalId":23207,"journal":{"name":"Traffic","volume":"1 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The emerging functions of intraflagellar transport 52 in ciliary transport and ciliopathies 纤毛运输和纤毛疾病中纤毛内运输 52 的新功能
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-11 DOI: 10.1111/tra.12929
Prajna Udupa, Debasish Kumar Ghosh
{"title":"The emerging functions of intraflagellar transport 52 in ciliary transport and ciliopathies","authors":"Prajna Udupa, Debasish Kumar Ghosh","doi":"10.1111/tra.12929","DOIUrl":"https://doi.org/10.1111/tra.12929","url":null,"abstract":"Ciliary transport in eukaryotic cells is an intricate and conserved process involving the coordinated assembly and functioning of a multiprotein intraflagellar transport (IFT) complex. Among the various IFT proteins, intraflagellar transport 52 (IFT52) plays a crucial role in ciliary transport and is implicated in various ciliopathies. IFT52 is a core component of the IFT-B complex that facilitates movement of cargoes along the ciliary axoneme. Stable binding of the IFT-B1 and IFT-B2 subcomplexes by IFT52 in the IFT-B complex regulates recycling of ciliary components and maintenance of ciliary functions such as signal transduction and molecular movement. Mutations in the <i>IFT52</i> gene can disrupt ciliary trafficking, resulting in dysfunctional cilia and affecting cellular processes in ciliopathies. Such ciliopathies caused by <i>IFT52</i> mutations exhibit a wide range of clinical features, including skeletal developmental abnormalities, retinal degeneration, respiratory failure and neurological abnormalities in affected individuals. Therefore, IFT52 serves as a promising biomarker for the diagnosis of various ciliopathies, including short-rib thoracic dysplasia 16 with or without polydactyly. Here, we provide an overview of the IFT52-mediated molecular mechanisms underlying ciliary transport and describe the <i>IFT52</i> mutations that cause different disorders associated with cilia dysfunction.","PeriodicalId":23207,"journal":{"name":"Traffic","volume":"256 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139461479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Role of trafficking protein particle complex 2 in medaka development. 转运蛋白颗粒复合物2在水母发育中的作用。
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-01 Epub Date: 2023-11-14 DOI: 10.1111/tra.12924
Francesca Zappa, Daniela Intartaglia, Andrea M Guarino, Rossella De Cegli, Cathal Wilson, Francesco Giuseppe Salierno, Elena Polishchuk, Nicolina Cristina Sorrentino, Ivan Conte, Maria Antonietta De Matteis
{"title":"Role of trafficking protein particle complex 2 in medaka development.","authors":"Francesca Zappa, Daniela Intartaglia, Andrea M Guarino, Rossella De Cegli, Cathal Wilson, Francesco Giuseppe Salierno, Elena Polishchuk, Nicolina Cristina Sorrentino, Ivan Conte, Maria Antonietta De Matteis","doi":"10.1111/tra.12924","DOIUrl":"10.1111/tra.12924","url":null,"abstract":"<p><p>The skeletal dysplasia spondyloepiphyseal dysplasia tarda (SEDT) is caused by mutations in the TRAPPC2 gene, which encodes Sedlin, a component of the trafficking protein particle (TRAPP) complex that we have shown previously to be required for the export of type II collagen (Col2) from the endoplasmic reticulum. No vertebrate model for SEDT has been generated thus far. To address this gap, we generated a Sedlin knockout animal by mutating the orthologous TRAPPC2 gene (olSedl) of Oryzias latipes (medaka) fish. OlSedl deficiency leads to embryonic defects, short size, diminished skeletal ossification and altered Col2 production and secretion, resembling human defects observed in SEDT patients. Moreover, SEDT knock-out animals display photoreceptor degeneration and gut morphogenesis defects, suggesting a key role for Sedlin in the development of these organs. Thus, by studying Sedlin function in vivo, we provide evidence for a mechanistic link between TRAPPC2-mediated membrane trafficking, Col2 export, and developmental disorders.</p>","PeriodicalId":23207,"journal":{"name":"Traffic","volume":" ","pages":"e12924"},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"107592335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IST1 regulates select recycling pathways. IST1调节选择性回收途径。
IF 3.6 3区 生物学
Traffic Pub Date : 2024-01-01 Epub Date: 2023-11-05 DOI: 10.1111/tra.12921
Amy K Clippinger, Teresa V Naismith, Wonjin Yoo, Silvia Jansen, David J Kast, Phyllis I Hanson
{"title":"IST1 regulates select recycling pathways.","authors":"Amy K Clippinger, Teresa V Naismith, Wonjin Yoo, Silvia Jansen, David J Kast, Phyllis I Hanson","doi":"10.1111/tra.12921","DOIUrl":"10.1111/tra.12921","url":null,"abstract":"<p><p>ESCRTs (Endosomal Sorting Complex Required for Transports) are a modular set of protein complexes with membrane remodeling activities that include the formation and release of intraluminal vesicles (ILVs) to generate multivesicular endosomes. While most of the 12 ESCRT-III proteins are known to play roles in ILV formation, IST1 has been associated with a wider range of endosomal remodeling events. Here, we extend previous studies of IST1 function in endosomal trafficking and confirm that IST1, along with its binding partner CHMP1B, contributes to scission of early endosomal carriers. Functionally, depleting IST1 impaired delivery of transferrin receptor from early/sorting endosomes to the endocytic recycling compartment and instead increased its rapid recycling to the plasma membrane via peripheral endosomes enriched in the clathrin adaptor AP-1. IST1 is also important for export of mannose 6-phosphate receptor from early/sorting endosomes. Examination of IST1 binding partners on endosomes revealed that IST1 interacts with the MIT domain-containing sorting nexin SNX15, a protein previously reported to regulate endosomal recycling. Our kinetic and spatial analyses establish that SNX15 and IST1 occupy a clathrin-containing subdomain on the endosomal perimeter distinct from those previously implicated in cargo retrieval or degradation. Using live-cell microscopy, we see that SNX15 and CHMP1B alternately recruit IST1 to this subdomain or the base of endosomal tubules. These findings indicate that IST1 contributes to a subset of recycling pathways from the early/sorting endosome.</p>","PeriodicalId":23207,"journal":{"name":"Traffic","volume":" ","pages":"e12921"},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11027954/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71486490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new Caenorhabditis elegans model to study copper toxicity in Wilson disease. 一种新的秀丽隐杆线虫模型,用于研究Wilson病中铜的毒性。
IF 3.6 3区 生物学
Traffic Pub Date : 2024-01-01 Epub Date: 2023-10-27 DOI: 10.1111/tra.12920
Federico Catalano, Thomas J O'Brien, Aleksandra A Mekhova, Lucia Vittoria Sepe, Mariantonietta Elia, Rossella De Cegli, Ivan Gallotta, Pamela Santonicola, Giuseppina Zampi, Ekaterina Y Ilyechova, Aleksei A Romanov, Polina D Samuseva, Josephine Salzano, Raffaella Petruzzelli, Elena V Polishchuk, Alessia Indrieri, Byung-Eun Kim, André E X Brown, Ludmila V Puchkova, Elia Di Schiavi, Roman S Polishchuk
{"title":"A new Caenorhabditis elegans model to study copper toxicity in Wilson disease.","authors":"Federico Catalano, Thomas J O'Brien, Aleksandra A Mekhova, Lucia Vittoria Sepe, Mariantonietta Elia, Rossella De Cegli, Ivan Gallotta, Pamela Santonicola, Giuseppina Zampi, Ekaterina Y Ilyechova, Aleksei A Romanov, Polina D Samuseva, Josephine Salzano, Raffaella Petruzzelli, Elena V Polishchuk, Alessia Indrieri, Byung-Eun Kim, André E X Brown, Ludmila V Puchkova, Elia Di Schiavi, Roman S Polishchuk","doi":"10.1111/tra.12920","DOIUrl":"10.1111/tra.12920","url":null,"abstract":"<p><p>Wilson disease (WD) is caused by mutations in the ATP7B gene that encodes a copper (Cu) transporting ATPase whose trafficking from the Golgi to endo-lysosomal compartments drives sequestration of excess Cu and its further excretion from hepatocytes into the bile. Loss of ATP7B function leads to toxic Cu overload in the liver and subsequently in the brain, causing fatal hepatic and neurological abnormalities. The limitations of existing WD therapies call for the development of new therapeutic approaches, which require an amenable animal model system for screening and validation of drugs and molecular targets. To achieve this objective, we generated a mutant Caenorhabditis elegans strain with a substitution of a conserved histidine (H828Q) in the ATP7B ortholog cua-1 corresponding to the most common ATP7B variant (H1069Q) that causes WD. cua-1 mutant animals exhibited very poor resistance to Cu compared to the wild-type strain. This manifested in a strong delay in larval development, a shorter lifespan, impaired motility, oxidative stress pathway activation, and mitochondrial damage. In addition, morphological analysis revealed several neuronal abnormalities in cua-1 mutant animals exposed to Cu. Further investigation suggested that mutant CUA-1 is retained and degraded in the endoplasmic reticulum, similarly to human ATP7B-H1069Q. As a consequence, the mutant protein does not allow animals to counteract Cu toxicity. Notably, pharmacological correctors of ATP7B-H1069Q reduced Cu toxicity in cua-1 mutants indicating that similar pathogenic molecular pathways might be activated by the H/Q substitution and, therefore, targeted for rescue of ATP7B/CUA-1 function. Taken together, our findings suggest that the newly generated cua-1 mutant strain represents an excellent model for Cu toxicity studies in WD.</p>","PeriodicalId":23207,"journal":{"name":"Traffic","volume":" ","pages":"e12920"},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10841361/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"54231173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sequence elements within the PEXEL motif and its downstream region modulate PTEX-dependent protein export in Plasmodium falciparum. PEXEL基序及其下游区域内的序列元件调节恶性疟原虫中PTEX依赖性蛋白的输出。
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-01 Epub Date: 2023-11-05 DOI: 10.1111/tra.12922
Mikha Gabriela, Claudia B G Barnes, Dickson Leong, Brad E Sleebs, Molly Parkyn Schneider, Dene R Littler, Brendan S Crabb, Tania F de Koning-Ward, Paul R Gilson
{"title":"Sequence elements within the PEXEL motif and its downstream region modulate PTEX-dependent protein export in Plasmodium falciparum.","authors":"Mikha Gabriela, Claudia B G Barnes, Dickson Leong, Brad E Sleebs, Molly Parkyn Schneider, Dene R Littler, Brendan S Crabb, Tania F de Koning-Ward, Paul R Gilson","doi":"10.1111/tra.12922","DOIUrl":"10.1111/tra.12922","url":null,"abstract":"<p><p>The parasite Plasmodium falciparum causes the most severe form of malaria and to invade and replicate in red blood cells (RBCs), it exports hundreds of proteins across the encasing parasitophorous vacuole membrane (PVM) into this host cell. The exported proteins help modify the RBC to support rapid parasite growth and avoidance of the human immune system. Most exported proteins possess a conserved Plasmodium export element (PEXEL) motif with the consensus RxLxE/D/Q amino acid sequence, which acts as a proteolytic cleavage recognition site within the parasite's endoplasmic reticulum (ER). Cleavage occurs after the P<sub>1</sub> L residue and is thought to help release the protein from the ER so it can be putatively escorted by the HSP101 chaperone to the parasitophorous vacuole space surrounding the intraerythrocytic parasite. HSP101 and its cargo are then thought to assemble with the rest of a Plasmodium translocon for exported proteins (PTEX) complex, that then recognises the xE/D/Q capped N-terminus of the exported protein and translocates it across the vacuole membrane into the RBC compartment. Here, we present evidence that supports a dual role for the PEXEL's conserved P<sub>2</sub> ' position E/Q/D residue, first, for plasmepsin V cleavage in the ER, and second, for efficient PTEX mediated export across the PVM into the RBC. We also present evidence that the downstream 'spacer' region separating the PEXEL motif from the folded functional region of the exported protein controls cargo interaction with PTEX as well. The spacer must be of a sufficient length and permissive amino acid composition to engage the HSP101 unfoldase component of PTEX to be efficiently translocated into the RBC compartment.</p>","PeriodicalId":23207,"journal":{"name":"Traffic","volume":" ","pages":"e12922"},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10952997/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71486492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Peroxisome population control by phosphoinositide signaling at the endoplasmic reticulum-plasma membrane interface. 通过内质网-质膜界面的磷酸肌醇信号控制过氧化物酶体群体。
IF 4.5 3区 生物学
Traffic Pub Date : 2024-01-01 Epub Date: 2023-11-05 DOI: 10.1111/tra.12923
Barbara Knoblach, Richard A Rachubinski
{"title":"Peroxisome population control by phosphoinositide signaling at the endoplasmic reticulum-plasma membrane interface.","authors":"Barbara Knoblach, Richard A Rachubinski","doi":"10.1111/tra.12923","DOIUrl":"10.1111/tra.12923","url":null,"abstract":"<p><p>Phosphoinositides are lipid signaling molecules acting at the interface of membranes and the cytosol to regulate membrane trafficking, lipid transport and responses to extracellular stimuli. Peroxisomes are multicopy organelles that are highly responsive to changes in metabolic and environmental conditions. In yeast, peroxisomes are tethered to the cell cortex at defined focal structures containing the peroxisome inheritance protein, Inp1p. We investigated the potential impact of changes in cortical phosphoinositide levels on the peroxisome compartment of the yeast cell. Here we show that the phosphoinositide, phosphatidylinositol-4-phosphate (PI4P), found at the junction of the cortical endoplasmic reticulum and plasma membrane (cER-PM) acts to regulate the cell's peroxisome population. In cells lacking a cER-PM tether or the enzymatic activity of the lipid phosphatase Sac1p, cortical PI4P is elevated, peroxisome numbers and motility are increased, and peroxisomes are no longer firmly tethered to Inp1p-containing foci. Reattachment of the cER to the PM through an artificial ER-PM \"staple\" in cells lacking the cER-PM tether does not restore peroxisome populations to the wild-type condition, demonstrating that integrity of PI4P signaling at the cell cortex is required for peroxisome homeostasis.</p>","PeriodicalId":23207,"journal":{"name":"Traffic","volume":" ","pages":"e12923"},"PeriodicalIF":4.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71486491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A vesicular Warburg effect: Aerobic glycolysis occurs on axonal vesicles for local NAD+ recycling and transport 水泡沃伯格效应有氧糖酵解发生在轴突小泡上,用于局部 NAD+ 循环和运输
IF 4.5 3区 生物学
Traffic Pub Date : 2023-12-12 DOI: 10.1111/tra.12926
Maximilian Mc Cluskey, Hervé Dubouchaud, Anne-Sophie Nicot, Frédéric Saudou
{"title":"A vesicular Warburg effect: Aerobic glycolysis occurs on axonal vesicles for local NAD+ recycling and transport","authors":"Maximilian Mc Cluskey, Hervé Dubouchaud, Anne-Sophie Nicot, Frédéric Saudou","doi":"10.1111/tra.12926","DOIUrl":"https://doi.org/10.1111/tra.12926","url":null,"abstract":"In neurons, fast axonal transport (FAT) of vesicles occurs over long distances and requires constant and local energy supply for molecular motors in the form of adenosine triphosphate (ATP). FAT is independent of mitochondrial metabolism. Indeed, the glycolytic machinery is present on vesicles and locally produces ATP, as well as nicotinamide adenine dinucleotide bonded with hydrogen (NADH) and pyruvate, using glucose as a substrate. It remains unclear whether pyruvate is transferred to mitochondria from the vesicles as well as how NADH is recycled into NAD+ on vesicles for continuous glycolysis activity. The optimization of a glycolytic activity test for subcellular compartments allowed the evaluation of the kinetics of vesicular glycolysis in the brain. This revealed that glycolysis is more efficient on vesicles than in the cytosol. We also found that lactate dehydrogenase (LDH) enzymatic activity is required for effective vesicular ATP production. Indeed, inhibition of LDH or the forced degradation of pyruvate inhibited ATP production from axonal vesicles. We found LDHA rather than the B isoform to be enriched on axonal vesicles suggesting a preferential transformation of pyruvate to lactate and a concomitant recycling of NADH into NAD<sup>+</sup> on vesicles. Finally, we found that LDHA inhibition dramatically reduces the FAT of both dense-core vesicles and synaptic vesicle precursors in a reconstituted cortico-striatal circuit on-a-chip. Together, this shows that aerobic glycolysis is required to supply energy for vesicular transport in neurons, similar to the Warburg effect.","PeriodicalId":23207,"journal":{"name":"Traffic","volume":"9 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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