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I/σI vs {Rmerg, Rmeas, Rpim, CC1/2} for Crystal Diffraction Data Quality Evaluation. 晶体衍射数据质量评价的I/σI vs {Rmerg, rmes, Rpim, CC1/2}
bioRxiv : the preprint server for biology Pub Date : 2025-02-02 DOI: 10.1101/2024.12.10.627855
Zhengqing Fu, Brian V Geisbrecht, Samuel Bouyain, Fred Dyda, John J Chrzas, Palani Kandavelu, Darcie J Miller, Bi-Cheng Wang
{"title":"I/σI vs {Rmerg, Rmeas, Rpim, CC1/2} for Crystal Diffraction Data Quality Evaluation.","authors":"Zhengqing Fu, Brian V Geisbrecht, Samuel Bouyain, Fred Dyda, John J Chrzas, Palani Kandavelu, Darcie J Miller, Bi-Cheng Wang","doi":"10.1101/2024.12.10.627855","DOIUrl":"10.1101/2024.12.10.627855","url":null,"abstract":"<p><p>X-ray crystal diffraction has provided atomic-level structural information on biological macromolecules. Data quality determines the reliability of structural models. In most cases, multiple data sets are available from different crystals and/or collected with different experimental settings. Reliable metrics are critical to rank and select the data set with the highest quality. Many measures have been created or modified for data quality evaluation. However, some are duplicate in functionality, and some are likely misused due to misunderstanding, which causes confusion or problems, especially at synchrotron beamlines where experiments proceed quickly. In this work, these measures are studied through both theoretical analysis and experimental data with various characteristics, which demonstrated that: 1). {Rmerg, Rmeas, Rpim, CC1/2} all measure the equivalence of reflections, and the low-shell values of these metrics can be used as reliable indicators for correctness (or trueness) of Laue symmetry; 2). High-shell I/σI is a reliable and better indicator to select resolution cutoff while the overall value measures the overall strength of the data.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11661158/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Systems biology-enabled targeting of NF-κΒ and BCL2 overcomes microenvironment-mediated BH3-mimetic resistance in DLBCL. 系统生物学驱动的NF-κB和BCL2靶向克服了微环境介导的DLBCL的BH3-模拟抗性。
bioRxiv : the preprint server for biology Pub Date : 2025-02-01 DOI: 10.1101/2024.11.30.626166
Aimilia Vareli, Haripriya Vaidehi Narayanan, Heather Clark, Eleanor Jayawant, Hui Zhou, Yi Liu, Lauren Stott, Fabio Simoes, Alexander Hoffmann, Andrea Pepper, Chris Pepper, Simon Mitchell
{"title":"Systems biology-enabled targeting of NF-κΒ and BCL2 overcomes microenvironment-mediated BH3-mimetic resistance in DLBCL.","authors":"Aimilia Vareli, Haripriya Vaidehi Narayanan, Heather Clark, Eleanor Jayawant, Hui Zhou, Yi Liu, Lauren Stott, Fabio Simoes, Alexander Hoffmann, Andrea Pepper, Chris Pepper, Simon Mitchell","doi":"10.1101/2024.11.30.626166","DOIUrl":"10.1101/2024.11.30.626166","url":null,"abstract":"<p><p>In Diffuse Large B-cell Lymphoma (DLBCL), elevated anti-apoptotic BCL2-family proteins (e.g., MCL1, BCL2, BCLXL) and NF-κB subunits (RelA, RelB, cRel) confer poor prognosis. Heterogeneous expression, regulatory complexity, and redundancy offsetting the inhibition of individual proteins, complicate the assignment of targeted therapy. We combined flow cytometry \"fingerprinting\", immunofluorescence imaging, and computational modeling to identify therapeutic vulnerabilities in DLBCL. The combined workflow predicted selective responses to BCL2 inhibition (venetoclax) and non-canonical NF-κB inhibition (Amgen16). Within the U2932 cell line we identified distinct resistance mechanisms to BCL2 inhibition in cellular sub-populations recapitulating intratumoral heterogeneity. Co-cultures with CD40L-expressing stromal cells, mimicking the tumor microenvironment (TME), induced resistance to BCL2 and BCLXL targeting BH3-mimetics via cell-type specific upregulation of BCLXL or MCL1. Computational models, validated experimentally, showed that basal NF-κB activation determined whether CD40 activation drove BH3-mimetic resistance through upregulation of RelB and BCLXL, or cRel and MCL1. High basal NF-κB activity could be overcome by inhibiting BTK to resensitize cells to BH3-mimetics in CD40L co-culture. Importantly, non-canonical NF-κB inhibition overcame heterogeneous compensatory BCL2 upregulation, restoring sensitivity to both BCL2- and BCLXL-targeting BH3-mimetics. Combined molecular fingerprinting and computational modelling provides a strategy for the precision use of BH3-mimetics and NF-κB inhibitors in DLBCL.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11642794/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142831849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CATSPERϵ extracellular domains are essential for sperm calcium channel assembly and activity modulation. CATSPERε的胞外结构域对于CatSper在发育过程中的组装以及精子获能过程中的活性调节至关重要。
bioRxiv : the preprint server for biology Pub Date : 2025-01-31 DOI: 10.1101/2024.11.18.624146
Jae Yeon Hwang, Huafeng Wang, Gillian Clouser, Jong-Nam Oh, Sarah F Finnegan, Niels E Skakkebaek, Jean-Ju Chung
{"title":"CATSPERϵ extracellular domains are essential for sperm calcium channel assembly and activity modulation.","authors":"Jae Yeon Hwang, Huafeng Wang, Gillian Clouser, Jong-Nam Oh, Sarah F Finnegan, Niels E Skakkebaek, Jean-Ju Chung","doi":"10.1101/2024.11.18.624146","DOIUrl":"10.1101/2024.11.18.624146","url":null,"abstract":"<p><p>The sperm flagellar-specific CatSper Ca2+ channel is a multiprotein complex critical for successful fertilization. The four ancillary subunits, CATSPERβ, γ, δ, and ε, form a unique canopy structure over the pore-forming channel. However, how the canopy is formed and what it does in the assembled channel complex remains unknown. Here, we report that extracellular domains (ECDs) of CATSPERε are essential for canopy and holo-complex assembly and modulate channel activity during sperm capacitation. CATSPERε-deficient males are sterile due to the absence of the entire channel and defective sperm hyperactivation. Expressing ECDs-truncated CATSPERε during spermatogenesis does not rescue the knockout because it fails to incorporate into the native complex. In contrast, addition of a CATSPERε ECD fragment during sperm capacitation significantly reduces channel activity. These findings provide insight into the underlying molecular and developmental mechanisms of CatSper assembly and how the channel can be modulated in physiological settings and by therapeutic intervention.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11601665/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Proteomic profiling of zinc homeostasis mechanisms in Pseudomonas aeruginosa through data-dependent and data-independent acquisition mass spectrometry.
bioRxiv : the preprint server for biology Pub Date : 2025-01-31 DOI: 10.1101/2025.01.13.632865
Annaliese Cs Meyer, Matthew R McIlvin, Paloma Lopez, Brian C Searle, Mak A Saito
{"title":"Proteomic profiling of zinc homeostasis mechanisms in Pseudomonas aeruginosa through data-dependent and data-independent acquisition mass spectrometry.","authors":"Annaliese Cs Meyer, Matthew R McIlvin, Paloma Lopez, Brian C Searle, Mak A Saito","doi":"10.1101/2025.01.13.632865","DOIUrl":"10.1101/2025.01.13.632865","url":null,"abstract":"<p><p>Zinc is central to the function of many proteins, yet the mechanisms of zinc homeostasis and their interplay with other cellular systems remain underexplored. In this study, we employ data-dependent acquisition (DDA) and data-independent acquisition (DIA) mass spectrometry to investigate proteome changes in Pseudomonas aeruginosa under conditions of different zinc availability. Using these methods, we detected 2143 unique proteins, 1578 of which were identified by both DDA and DIA. We demonstrated that most of the previously described Zn homeostasis systems exhibit proteomic responses that follow similar trends to those seen in transcriptomics studies. However, some proteins that are considered instrumental in Zn homeostasis, notably those in Zn transporter ZnuABC, were not detected by our methods, although other proteins of other uptake systems were abundant. Furthermore, changes in abundance of multiple Zn-metalloproteins and Zn-independent homologs were clearly observable, with respective increases and decreases when Zn was provided, though the magnitude of these changes varied. Most of the Zn-metalloproteins observed were located in one of two Zur-regulated operons between PA5534 and PA5541. This study provides a view of Zn homeostasis mechanisms that is complementary to existing transcriptomics investigations: as gene transcripts are not strictly proportional to the actual distribution of proteins within a cell, analysis of the proteome offers another way to assess the relative use and importance of similar or ostensibly redundant systems in different conditions and can highlight shifts in metal prioritization between metalloproteins.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11761036/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tumor Cell Spatial Organization Directs EGFR/RAS/RAF Pathway Primary Therapy Resistance through YAP Signaling. 肿瘤细胞空间组织通过 YAP 信号转导表皮生长因子受体/RAS/RAF 通路原发性治疗抗性
bioRxiv : the preprint server for biology Pub Date : 2025-01-31 DOI: 10.1101/2024.09.26.615226
Rachel Nakagawa, Andrew Beardsley, Sophia Durney, Mary-Kate Hayward, Vishvak Subramanyam, Nathaniel P Meyer, Harrison Wismer, Hani Goodarzi, Valerie M Weaver, Daniel Van de Mark, Andrei Goga
{"title":"Tumor Cell Spatial Organization Directs EGFR/RAS/RAF Pathway Primary Therapy Resistance through YAP Signaling.","authors":"Rachel Nakagawa, Andrew Beardsley, Sophia Durney, Mary-Kate Hayward, Vishvak Subramanyam, Nathaniel P Meyer, Harrison Wismer, Hani Goodarzi, Valerie M Weaver, Daniel Van de Mark, Andrei Goga","doi":"10.1101/2024.09.26.615226","DOIUrl":"10.1101/2024.09.26.615226","url":null,"abstract":"<p><p>Non-small cell lung cancers (NSCLC) harboring common mutations in EGFR and KRAS characteristically respond transiently to targeted therapies against those mutations, but invariably, tumors recur and progress. Resistance often emerges through mutations in the therapeutic target or activation of alternative signaling pathways. Mechanisms of acute tumor cell resistance to initial EGFR (EGFRi) or KRASG12C (G12Ci) pathway inhibition remain poorly understood. Our study reveals that acute response to EGFR/RAS/RAF-pathway inhibition is spatial and culture context specific. In vivo, EGFR mutant tumor xenografts shrink by > 90% following acute EGFRi therapy, and residual tumor cells are associated with dense stroma and have increased nuclear YAP. Interestingly, in vitro EGFRi induced cell cycle arrest in NSCLC cells grown in monolayer, while 3D spheroids preferentially die upon inhibitor treatment. We find differential YAP nuclear localization and activity, driven by the distinct culture conditions, as a common resistance mechanism for selective EGFR/KRAS/BRAF pathway therapies. Forced expression of the YAPS127A mutant partially protects cells from EGFR-mediated cell death in spheroid culture. These studies identify YAP activation in monolayer culture as a non-genetic mechanism of acute EGFR/KRAS/BRAF therapy resistance, highlighting that monolayer vs spheroid cell culture systems can model distinct stages of patient cancer progression.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11463411/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142396864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tryptophan metabolism reprogramming contributes to the prothrombotic milieu in mice and humans infected with SARS-CoV-2.
bioRxiv : the preprint server for biology Pub Date : 2025-01-30 DOI: 10.1101/2025.01.17.633602
Saravanan Subramaniam, Marc Arthur Napoleon, Saran Lotfollahzadeh, Mohamed Hassan Kamal, Helena Kurniawan, Murad Elsadawi, Devin Kenney, Florian Douam, Markus Bosmann, Stephen Whelan, Howard Cabral, Eric J Burks, Grace Zhao, Vijay Kolachalama, Katya Ravid, Vipul Chitalia
{"title":"Tryptophan metabolism reprogramming contributes to the prothrombotic milieu in mice and humans infected with SARS-CoV-2.","authors":"Saravanan Subramaniam, Marc Arthur Napoleon, Saran Lotfollahzadeh, Mohamed Hassan Kamal, Helena Kurniawan, Murad Elsadawi, Devin Kenney, Florian Douam, Markus Bosmann, Stephen Whelan, Howard Cabral, Eric J Burks, Grace Zhao, Vijay Kolachalama, Katya Ravid, Vipul Chitalia","doi":"10.1101/2025.01.17.633602","DOIUrl":"https://doi.org/10.1101/2025.01.17.633602","url":null,"abstract":"<p><p>SARS-CoV-2 infection disturbs the coagulation balance in the blood, triggering thrombosis and contributing to organ failure. The role of prothrombotic metabolites in COVID-19-associated coagulopathy remains elusive. Leveraging K18-hACE2 mice infected with SARS-CoV-2, we observed higher levels of the tryptophan metabolite, kynurenine, compared to controls. SARS CoV-2 infected mice showed a significant upregulation of enzymes controlling Kynurenine biogenesis, such as indoleamine 2,3-dioxygenase (IDO-1) and tryptophan 2,3-dioxygenase levels in kidneys and liver, respectively, as well as changes in the enzymes involved in kynurenine catabolism, including kynurenine monooxygenase and kynurinase. Consistent with the agonistic role of these metabolites in Aryl Hydrocarbon Receptor (AHR) signaling, AHR activation and its downstream mediator, tissue factor (TF), a highly potent procoagulant factor, was observed in endothelial cells (ECs) of lungs and kidneys of infected mice. These findings were validated in humans, where compared to controls, sera of COVID-19 patients showed increased levels of Kynurenine, kynurenic acid, anthranilic acid, and quinolinic acid. Activation of the AHR-TF axis was noted in the kidneys and lungs of COVID-19 patients, and COVID-19 sera showed higher IDO-1 activity than controls. Levels of Kyn in COVID-19 patients correlated strongly with the TF inducing activity of COVID-19 sera on ECs. A specific IDO-1 inhibitor or AHR inhibitor separately or in combination suppressed COVID-19 sera-induced TF activity in ECs. Together, we identified IDO-1 as upregulated by SARS-CoV-2 infection, resulting in augmented Kyn and its prothrombotic catabolites, thereby suggesting the Kyn AHR-TF axis as possibly a new diagnostic and/or therapeutic target.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11785031/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High resolution structures of Myosin-IC reveal a unique actin-binding orientation, ADP release pathway, and power stroke trajectory. Myosin-IC的高分辨率结构揭示了独特的肌动蛋白结合取向、ADP释放途径和功率中风轨迹。
bioRxiv : the preprint server for biology Pub Date : 2025-01-30 DOI: 10.1101/2025.01.10.632429
Sai Shashank Chavali, Peter J Carman, Henry Shuman, E Michael Ostap, Charles V Sindelar
{"title":"High resolution structures of Myosin-IC reveal a unique actin-binding orientation, ADP release pathway, and power stroke trajectory.","authors":"Sai Shashank Chavali, Peter J Carman, Henry Shuman, E Michael Ostap, Charles V Sindelar","doi":"10.1101/2025.01.10.632429","DOIUrl":"10.1101/2025.01.10.632429","url":null,"abstract":"<p><p>Myosin-IC (myo1c) is a class-I myosin that supports transport and remodeling of the plasma membrane and membrane-bound vesicles. Like other members of the myosin family, its biochemical kinetics are altered in response to changes in mechanical loads that resist the power stroke. However, myo1c is unique in that the primary force-sensitive kinetic transition is the isomerization that follows ATP binding, not ADP release as in other slow myosins. Myo1c also powers actin gliding along curved paths, propelling actin filaments in leftward circles. To understand the origins of this unique force-sensing and motile behavior, we solved actin-bound myo1c cryo-EM structures in the presence and absence of ADP. Our structures reveal that in contrast with other myosins, the myo1c lever arm swing is skewed, partly due to a different actin interface that reorients the motor domain on actin. The structures also reveal unique nucleotide-dependent behavior of both the nucleotide pocket as well as an element called the N-terminal extension. We incorporate these observations into a model that explains why force primarily regulates ATP binding in myo1c, rather than ADP release as in other myosins. Integrating our cryo-EM data with available crystallography structures allows the modeling of full-length myo1c during force generation, supplying insights into its role in membrane remodeling. These results highlight how relatively minor sequence differences in members of the myosin superfamily can significantly alter power stroke geometry and force sensing properties, with important implications for biological function.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11741418/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simultaneous, real-time tracking of many neuromodulatory signals with Multiplexed Optical Recording of Sensors on a micro-Endoscope.
bioRxiv : the preprint server for biology Pub Date : 2025-01-30 DOI: 10.1101/2025.01.26.634931
Peter N Kalugin, Paul A Soden, Crystian I Massengill, Oren Amsalem, Marta Porniece, Diana C Guarino, David Tingley, Stephen X Zhang, Jordan C Benson, Madalon F Hammell, David M Tong, Charlotte D Ausfahl, Tiara E Lacey, Ya'el Courtney, Alexandra Hochstetler, Andrew Lutas, Huan Wang, Lan Geng, Guochuan Li, Bohan Li, Yulong Li, Maria K Lehtinen, Mark L Andermann
{"title":"Simultaneous, real-time tracking of many neuromodulatory signals with Multiplexed Optical Recording of Sensors on a micro-Endoscope.","authors":"Peter N Kalugin, Paul A Soden, Crystian I Massengill, Oren Amsalem, Marta Porniece, Diana C Guarino, David Tingley, Stephen X Zhang, Jordan C Benson, Madalon F Hammell, David M Tong, Charlotte D Ausfahl, Tiara E Lacey, Ya'el Courtney, Alexandra Hochstetler, Andrew Lutas, Huan Wang, Lan Geng, Guochuan Li, Bohan Li, Yulong Li, Maria K Lehtinen, Mark L Andermann","doi":"10.1101/2025.01.26.634931","DOIUrl":"https://doi.org/10.1101/2025.01.26.634931","url":null,"abstract":"<p><p>Dozens of extracellular molecules jointly impact a given neuron, yet we lack methods to simultaneously record many such signals in real time. We developed a probe to track ten or more neuropeptides and neuromodulators using spatial multiplexing of genetically encoded fluorescent sensors. Cultured cells expressing one sensor at a time are immobilized at the front of a gradient refractive index (GRIN) lens for 3D two-photon imaging <i>in vitro</i> and <i>in vivo</i> . The sensor identity and detection sensitivity of each cell are determined via robotic dipping of the probe into wells containing various ligands and concentrations. Using this probe, we detected stimulation-evoked release of multiple neuromodulators in acute brain slices. We also tracked endogenous and drug-evoked changes in cerebrospinal fluid composition in the awake mouse lateral ventricle, which triggered downstream activation of the choroid plexus epithelium. Our approach offers a first step towards quantitative, real-time, high-dimensional tracking of brain fluid composition.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11785251/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
KaMLs for Predicting Protein pKa Values and Ionization States: Are Trees All You Need? 预测蛋白质 p K a 值和电离状态的 KaML:树是您所需要的吗?
bioRxiv : the preprint server for biology Pub Date : 2025-01-30 DOI: 10.1101/2024.11.09.622800
Mingzhe Shen, Daniel Kortzak, Simon Ambrozak, Shubham Bhatnagar, Ian Buchanan, Ruibin Liu, Jana Shen
{"title":"KaMLs for Predicting Protein pKa Values and Ionization States: Are Trees All You Need?","authors":"Mingzhe Shen, Daniel Kortzak, Simon Ambrozak, Shubham Bhatnagar, Ian Buchanan, Ruibin Liu, Jana Shen","doi":"10.1101/2024.11.09.622800","DOIUrl":"10.1101/2024.11.09.622800","url":null,"abstract":"<p><p>Despite its importance in understanding biology and computer-aided drug discovery, the accurate prediction of protein ionization states remains a formidable challenge. Physicsbased approaches struggle to capture the small, competing contributions in the complex protein environment, while machine learning (ML) is hampered by scarcity of experimental data. Here we report the development of pKa ML (KaML) models based on decision trees and graph attention networks (GAT), exploiting physicochemical understanding and a new experiment pKa database (PKAD-3) enriched with highly shifted pKa's. KaML-CBtree significantly outperforms the current state of the art in predicting pKa values and ionization states across all six titratable amino acids, notably achieving accurate predictions for deprotonated cysteines and lysines - a blind spot in previous models. The superior performance of KaMLs is achieved in part through several innovations, including separate treatment of acid and base, data augmentation using AlphaFold structures, and model pretraining on a theoretical pKa database. We also introduce the classification of protonation states as a metric for evaluating pKa prediction models. A meta-feature analysis suggests a possible reason for the lightweight tree model to outperform the more complex deep learning GAT. We release an end-to-end pKa predictor based on KaML-CBtree and the new PKAD-3 database, which facilitates a variety of applications and provides the foundation for further advances in protein electrostatics research.</p>","PeriodicalId":519960,"journal":{"name":"bioRxiv : the preprint server for biology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11601431/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bipolar and schizophrenia risk gene AKAP11 encodes an autophagy receptor coupling the regulation of PKA kinase network homeostasis to synaptic transmission. 双相情感障碍和精神分裂症风险基因AKAP11编码自噬受体偶联PKA激酶网络稳态调节突触传递。
bioRxiv : the preprint server for biology Pub Date : 2025-01-29 DOI: 10.1101/2024.12.30.630813
You-Kyung Lee, Cong Xiao, Xiaoting Zhou, Le Wang, Meghan G McReynolds, Zhiping Wu, Eric Purisic, Henry Kim, Xianting Li, Zhiping P Pang, Jinye Dai, Junmin Peng, Nan Yang, Zhenyu Yue
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