{"title":"Biological Insight from Super-Resolution Microscopy: What We Can Learn from Localization-Based Images.","authors":"David Baddeley, Joerg Bewersdorf","doi":"10.1146/annurev-biochem-060815-014801","DOIUrl":"https://doi.org/10.1146/annurev-biochem-060815-014801","url":null,"abstract":"<p><p>Super-resolution optical imaging based on the switching and localization of individual fluorescent molecules [photoactivated localization microscopy (PALM), stochastic optical reconstruction microscopy (STORM), etc.] has evolved remarkably over the last decade. Originally driven by pushing technological limits, it has become a tool of biological discovery. The initial demand for impressive pictures showing well-studied biological structures has been replaced by a need for quantitative, reliable data providing dependable evidence for specific unresolved biological hypotheses. In this review, we highlight applications that showcase this development, identify the features that led to their success, and discuss remaining challenges and difficulties. In this context, we consider the complex topic of defining resolution for this imaging modality and address some of the more common analytical methods used with this data.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"87 ","pages":"965-989"},"PeriodicalIF":16.6,"publicationDate":"2018-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-060815-014801","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10855756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Structural Studies of Amyloid Proteins at the Molecular Level.","authors":"D. Eisenberg, M. Sawaya","doi":"10.1146/annurev-biochem-061516-045104","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-045104","url":null,"abstract":"Dozens of proteins are known to convert to the aggregated amyloid state. These include fibrils associated with systemic and neurodegenerative diseases and cancer, functional amyloid fibrils in microorganisms and animals, and many denatured proteins. Amyloid fibrils can be much more stable than other protein assemblies. In contrast to globular proteins, a single protein sequence can aggregate into several distinctly different amyloid structures, termed polymorphs, and a given polymorph can reproduce itself by seeding. Amyloid polymorphs may be the molecular basis of prion strains. Whereas the Protein Data Bank contains some 100,000 globular protein and 3,000 membrane protein structures, only a few dozen amyloid protein structures have been determined, and most of these are short segments of full amyloid-forming proteins. Regardless, these amyloid structures illuminate the architecture of the amyloid state, including its stability and its capacity for formation of polymorphs.","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 1","pages":"69-95"},"PeriodicalIF":16.6,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-045104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43196894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"At the Intersection of Chemistry, Biology, and Medicine.","authors":"C. Walsh","doi":"10.1146/annurev-biochem-110716-121241","DOIUrl":"https://doi.org/10.1146/annurev-biochem-110716-121241","url":null,"abstract":"After an undergraduate degree in biology at Harvard, I started graduate school at The Rockefeller Institute for Medical Research in New York City in July 1965. I was attracted to the chemical side of biochemistry and joined Fritz Lipmann's large, hierarchical laboratory to study enzyme mechanisms. That work led to postdoctoral research with Robert Abeles at Brandeis, then a center of what, 30 years later, would be called chemical biology. I spent 15 years on the Massachusetts Institute of Technology faculty, in both the Chemistry and Biology Departments, and then 26 years on the Harvard Medical School Faculty. My research interests have been at the intersection of chemistry, biology, and medicine. One unanticipated major focus has been investigating the chemical logic and enzymatic machinery of natural product biosynthesis, including antibiotics and antitumor agents. In this postgenomic era it is now recognized that there may be from 105 to 106 biosynthetic gene clusters as yet uncharacterized for potential new therapeutic agents.","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 1","pages":"1-19"},"PeriodicalIF":16.6,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-110716-121241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45121092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Molecular Characteristics and Biological Functions of Surface-Active and Surfactant Proteins.","authors":"M. Sunde, Chi L. L. Pham, A. Kwan","doi":"10.1146/annurev-biochem-061516-044847","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-044847","url":null,"abstract":"Many critical biological processes take place at hydrophobic:hydrophilic interfaces, and a wide range of organisms produce surface-active proteins and peptides that reduce surface and interfacial tension and mediate growth and development at these boundaries. Microorganisms produce both small lipid-associated peptides and amphipathic proteins that allow growth across water:air boundaries, attachment to surfaces, predation, and improved bioavailability of hydrophobic substrates. Higher-order organisms produce surface-active proteins with a wide variety of functions, including the provision of protective foam environments for vulnerable reproductive stages, evaporative cooling, and gas exchange across airway membranes. In general, the biological functions supported by these diverse polypeptides require them to have an amphipathic nature, and this is achieved by a diverse range of molecular structures, with some proteins undergoing significant conformational change or intermolecular association to generate the structures that are surface active.","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 1","pages":"585-608"},"PeriodicalIF":16.6,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-044847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48676674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Wu, Heather E. Upton, Jacob M. Vogan, K. Collins
{"title":"Telomerase Mechanism of Telomere Synthesis.","authors":"R. Wu, Heather E. Upton, Jacob M. Vogan, K. Collins","doi":"10.1146/annurev-biochem-061516-045019","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-045019","url":null,"abstract":"Telomerase is the essential reverse transcriptase required for linear chromosome maintenance in most eukaryotes. Telomerase supplements the tandem array of simple-sequence repeats at chromosome ends to compensate for the DNA erosion inherent in genome replication. The template for telomerase reverse transcriptase is within the RNA subunit of the ribonucleoprotein complex, which in cells contains additional telomerase holoenzyme proteins that assemble the active ribonucleoprotein and promote its function at telomeres. Telomerase is distinct among polymerases in its reiterative reuse of an internal template. The template is precisely defined, processively copied, and regenerated by release of single-stranded product DNA. New specificities of nucleic acid handling that underlie the catalytic cycle of repeat synthesis derive from both active site specialization and new motif elaborations in protein and RNA subunits. Studies of telomerase provide unique insights into cellular requirements for genome stability, tissue renewal, and tumorigenesis as well as new perspectives on dynamic ribonucleoprotein machines.","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 1","pages":"439-460"},"PeriodicalIF":16.6,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-045019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63955786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Biochemistry of Catabolic Reductive Dehalogenation.","authors":"Maeva Fincker, Alfred M Spormann","doi":"10.1146/annurev-biochem-061516-044829","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-044829","url":null,"abstract":"<p><p>A wide range of phylogenetically diverse microorganisms couple the reductive dehalogenation of organohalides to energy conservation. Key enzymes of such anaerobic catabolic pathways are corrinoid and Fe-S cluster-containing, membrane-associated reductive dehalogenases. These enzymes catalyze the reductive elimination of a halide and constitute the terminal reductases of a short electron transfer chain. Enzymatic and physiological studies revealed the existence of quinone-dependent and quinone-independent reductive dehalogenases that are distinguishable at the amino acid sequence level, implying different modes of energy conservation in the respective microorganisms. In this review, we summarize current knowledge about catabolic reductive dehalogenases and the electron transfer chain they are part of. We review reaction mechanisms and the role of the corrinoid and Fe-S cluster cofactors and discuss physiological implications.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 ","pages":"357-386"},"PeriodicalIF":16.6,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-044829","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35122177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"How α-Helical Motifs Form Functionally Diverse Lipid-Binding Compartments.","authors":"Lucy Malinina, Dinshaw J Patel, Rhoderick E Brown","doi":"10.1146/annurev-biochem-061516-044445","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-044445","url":null,"abstract":"<p><p>Lipids are produced site-specifically in cells and then distributed nonrandomly among membranes via vesicular and nonvesicular trafficking mechanisms. The latter involves soluble amphitropic proteins extracting specific lipids from source membranes to function as molecular solubilizers that envelope their insoluble cargo before transporting it to destination sites. Lipid-binding and lipid transfer structural motifs range from multi-β-strand barrels, to β-sheet cups and baskets covered by α-helical lids, to multi-α-helical bundles and layers. Here, we focus on how α-helical proteins use amphipathic helical layering and bundling to form modular lipid-binding compartments and discuss the functional consequences. Preformed compartments generally rely on intramolecular disulfide bridging to maintain conformation (e.g., albumins, nonspecific lipid transfer proteins, saposins, nematode polyprotein allergens/antigens). Insights into nonpreformed hydrophobic compartments that expand and adapt to accommodate a lipid occupant are few and provided mostly by the three-layer, α-helical ligand-binding domain of nuclear receptors. The simple but elegant and nearly ubiquitous two-layer, α-helical glycolipid transfer protein (GLTP)-fold now further advances understanding.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 ","pages":"609-636"},"PeriodicalIF":16.6,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-044445","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34883922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cellular Electron Cryotomography: Toward Structural Biology In Situ.","authors":"Catherine M Oikonomou, Grant J Jensen","doi":"10.1146/annurev-biochem-061516-044741","DOIUrl":"https://doi.org/10.1146/annurev-biochem-061516-044741","url":null,"abstract":"<p><p>Electron cryotomography (ECT) provides three-dimensional views of macromolecular complexes inside cells in a native frozen-hydrated state. Over the last two decades, ECT has revealed the ultrastructure of cells in unprecedented detail. It has also allowed us to visualize the structures of macromolecular machines in their native context inside intact cells. In many cases, such machines cannot be purified intact for in vitro study. In other cases, the function of a structure is lost outside the cell, so that the mechanism can be understood only by observation in situ. In this review, we describe the technique and its history and provide examples of its power when applied to cell biology. We also discuss the integration of ECT with other techniques, including lower-resolution fluorescence imaging and higher-resolution atomic structure determination, to cover the full scale of cellular processes.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 ","pages":"873-896"},"PeriodicalIF":16.6,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-061516-044741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34927833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electric Fields and Enzyme Catalysis.","authors":"Stephen D Fried, Steven G Boxer","doi":"10.1146/annurev-biochem-061516-044432","DOIUrl":"10.1146/annurev-biochem-061516-044432","url":null,"abstract":"<p><p>What happens inside an enzyme's active site to allow slow and difficult chemical reactions to occur so rapidly? This question has occupied biochemists' attention for a long time. Computer models of increasing sophistication have predicted an important role for electrostatic interactions in enzymatic reactions, yet this hypothesis has proved vexingly difficult to test experimentally. Recent experiments utilizing the vibrational Stark effect make it possible to measure the electric field a substrate molecule experiences when bound inside its enzyme's active site. These experiments have provided compelling evidence supporting a major electrostatic contribution to enzymatic catalysis. Here, we review these results and develop a simple model for electrostatic catalysis that enables us to incorporate disparate concepts introduced by many investigators to describe how enzymes work into a more unified framework stressing the importance of electric fields at the active site.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 ","pages":"387-415"},"PeriodicalIF":16.6,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5600505/pdf/nihms870064.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34883926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Extracellular Heme Uptake and the Challenge of Bacterial Cell Membranes.","authors":"Weiliang Huang, Angela Wilks","doi":"10.1146/annurev-biochem-060815-014214","DOIUrl":"https://doi.org/10.1146/annurev-biochem-060815-014214","url":null,"abstract":"<p><p>Iron is essential for the survival of most bacteria but presents a significant challenge given its limited bioavailability. Furthermore, the toxicity of iron combined with the need to maintain physiological iron levels within a narrow concentration range requires sophisticated systems to sense, regulate, and transport iron. Most bacteria have evolved mechanisms to chelate and transport ferric iron (Fe<sup>3+</sup>) via siderophore receptor systems, and pathogenic bacteria have further lowered this barrier by employing mechanisms to utilize the host's hemoproteins. Once internalized, heme is cleaved by both oxidative and nonoxidative mechanisms to release iron. Heme, itself a lipophilic and toxic molecule, presents a significant challenge for transport into the cell. As such, pathogenic bacteria have evolved sophisticated cell surface signaling and transport systems to obtain heme from the host. In this review, we summarize the structure and function of the heme-sensing and transport systems of pathogenic bacteria and the potential of these systems as antimicrobial targets.</p>","PeriodicalId":7980,"journal":{"name":"Annual review of biochemistry","volume":"86 ","pages":"799-823"},"PeriodicalIF":16.6,"publicationDate":"2017-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1146/annurev-biochem-060815-014214","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34927832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}