Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2025-12-12DOI: 10.1146/annurev-biophys-021424-010232
Lydia Hodgins, Baljyot Singh Parmar, Rodrigo Reyes-Lamothe, Stephanie C Weber
{"title":"Size Matters: A Biophysical Perspective on Biomolecular Condensates in Bacteria.","authors":"Lydia Hodgins, Baljyot Singh Parmar, Rodrigo Reyes-Lamothe, Stephanie C Weber","doi":"10.1146/annurev-biophys-021424-010232","DOIUrl":"10.1146/annurev-biophys-021424-010232","url":null,"abstract":"<p><p>Bacteria are unicellular organisms that typically lack membrane-bound organelles. Nevertheless, they are not merely \"bags of enzymes\" and instead use alternate mechanisms to organize their components in space and time. Biomolecular condensates are a newly described class of membraneless compartment that organizes cellular functions in bacteria. In this review, we cover key biophysical features of bacterial cells and discuss how their finite size and crowded interior may affect condensate nucleation and stability. Next, we describe three examples of endogenous condensates, highlighting the molecular components driving their formation and the functional roles they may play in cells. Finally, we provide an overview of current and prospective tools to study and manipulate both endogenous and synthetic condensates alike. Overall, bacterial condensates present a fascinating system to explore open questions that span the disciplines of biophysics, molecular and cell biology, and bioengineering.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"113-133"},"PeriodicalIF":13.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145745475","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-02-05DOI: 10.1146/annurev-biophys-021424-011156
Zhenfeng Liu, Xin You, Mei Li, Sen-Fang Sui
{"title":"Structures of Photosynthetic Supramolecular Complexes.","authors":"Zhenfeng Liu, Xin You, Mei Li, Sen-Fang Sui","doi":"10.1146/annurev-biophys-021424-011156","DOIUrl":"10.1146/annurev-biophys-021424-011156","url":null,"abstract":"<p><p>Photosynthesis, the biological process of converting light energy into chemical energy, involves light harvesting, charge separation and electron transport, proton translocation, ATP synthesis, and carbon fixation, among other processes. Adjacent photosynthetic complexes may assemble into supramolecular complexes to couple and regulate their functions. Here, we review the progress of structural biology studies of photosynthetic supramolecular complexes, such as those that have light-harvesting complexes assembled with photosystem II (PSII) or photosystem I (PSI), both PSII and PSI, or bacterial reaction center complexes. The intricate architectures of the NADH dehydrogenase-like (NDH) complex and PSI-NDH supercomplex, revealed through cryo-electron microscopy studies, provide crucial frameworks for understanding the molecular mechanisms of cyclic electron flow in cyanobacteria and plants. Furthermore, structural studies have also yielded detailed insights into the assembly and repair of PSII, regulation of ATP synthase, and carbon fixation. The review concludes with a summary of the emerging directions of structural biology studies of photosynthetic supramolecular complexes.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"415-441"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146126574","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-01-23DOI: 10.1146/annurev-biophys-021424-011450
Nikolai Slavov
{"title":"Single-Cell Proteomic Technologies: Tools in the Quest for Principles.","authors":"Nikolai Slavov","doi":"10.1146/annurev-biophys-021424-011450","DOIUrl":"10.1146/annurev-biophys-021424-011450","url":null,"abstract":"<p><p>Over the last decade, proteomics analysis of single cells by mass spectrometry transitioned from an uncertain possibility to a set of robust and rapidly advancing technologies supporting the accurate quantification of thousands of proteins. We review the major drivers of this progress, from establishing feasibility to powerful and increasingly scalable methods. We focus on the trade-offs and synergies of different technological solutions within a coherent conceptual framework, which projects considerable room both for throughput scaling and for extending the analysis scope to functional protein measurements. We highlight the potential of these technologies to support the development of mechanistic biophysical models and to help uncover new principles.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"253-275"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13108667/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146042110","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2025-11-18DOI: 10.1146/annurev-biophys-022224-105324
Catherine Royer
{"title":"Mapping Protein Conformational Landscapes with High-Pressure NMR.","authors":"Catherine Royer","doi":"10.1146/annurev-biophys-022224-105324","DOIUrl":"10.1146/annurev-biophys-022224-105324","url":null,"abstract":"<p><p>This review focuses on the use of high-pressure nuclear magnetic resonance (HP NMR) to map local protein stability and conformational landscapes, with an emphasis on the population and characteristics of protein excited states. Section 2 discusses the volumetric properties of proteins in the pressure-temperature plane, highlighting the underlying mechanisms of pressure effects, the magnitude of the volume changes upon unfolding, their temperature dependence, and the nature of the unfolded state at high pressure. In Section 3, NMR-detected, pressure-induced equilibrium unfolding of proteins is discussed. Section 4 covers how HP NMR can reveal the complexity of protein conformational landscapes, the population of excited states, and the local stability distribution across the structure. Studies exploring the sequence determinants of these landscapes are presented. Of particular interest are the sequence determinants that define the excited states implicated in functional dynamics, one of the most important unresolved issues in protein science.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"39-55"},"PeriodicalIF":13.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145551769","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-02-10DOI: 10.1146/annurev-biophys-021424-014456
Kelly Aspinwall, Tyler Hain, M Lisa Manning
{"title":"Rigidity and Mechanical Response in Biological Structures.","authors":"Kelly Aspinwall, Tyler Hain, M Lisa Manning","doi":"10.1146/annurev-biophys-021424-014456","DOIUrl":"10.1146/annurev-biophys-021424-014456","url":null,"abstract":"<p><p>Rigidity is an emergent property of materials-it is not a feature of individual components that compose the structure, but instead arises from interactions between many constituent parts. It has been recognized that floppy-rigid or fluid-solid transitions are harnessed by biological systems at all scales to drive form and function. This review focuses on the different mechanisms that can drive emergent rigidity transitions in biomechanical networks and describes how they arise in mathematical formalisms and how they are observed in practice in experiments. The goal is to aid researchers in identifying mechanisms governing rigidity in their biological systems of interest, highlight mechanical features that are universal across different systems, and help drive new scientific hypotheses for observed mechanical phenomena in biology. Looking forward, we also discuss how biological systems might tune themselves toward or away from such transitions over developmental or evolutionary timescales.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"469-491"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146159143","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-01-28DOI: 10.1146/annurev-biophys-021424-112247
Yuhai Tu
{"title":"Nonequilibrium Thermodynamics for Biochemical Networks: Energetic Principles of Cellular Function.","authors":"Yuhai Tu","doi":"10.1146/annurev-biophys-021424-112247","DOIUrl":"10.1146/annurev-biophys-021424-112247","url":null,"abstract":"<p><p>I review recent advances in nonequilibrium thermodynamics of biochemical networks, organized around two central questions. First, why is free energy dissipation essential for enabling or enhancing biological function? Second, how do energetic costs constrain functional performance? Using several representative systems-beginning with the classical kinetic proofreading mechanism and extending to more recent examples such as accurate sensory adaptation, ultrasensitive responses, and synchronization of biochemical oscillators-I show that this framework not only provides new insights into the molecular mechanisms underlying these diverse processes but also reveals the general thermodynamic principles that govern their biological functions. I highlight the characteristic signatures of nonequilibrium behavior and the emergence of fundamental energy-performance trade-offs. This review strives to present the framework pedagogically and with sufficient technical detail to enable theory-inclined biophysicists to apply it to their own systems of interest. I conclude by proposing a nonequilibrium thermodynamic law for living systems and outlining promising directions for extending this theoretical approach to an even broader range of biological phenomena.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":"55 1","pages":"225-252"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147845691","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-01-23DOI: 10.1146/annurev-biophys-021424-125106
Yao Liu, Xinmeng Gao, Shuo Huang
{"title":"Nanopore Single-Molecule Chemistry.","authors":"Yao Liu, Xinmeng Gao, Shuo Huang","doi":"10.1146/annurev-biophys-021424-125106","DOIUrl":"10.1146/annurev-biophys-021424-125106","url":null,"abstract":"<p><p>Nanopores have become transformative tools in single-molecule chemical analysis, enabling detailed interrogation of molecular interactions and reaction dynamics. These advancements have revolutionized the characterization of chemical kinetics and stereospecificity, broadening nanopore applications. This review evaluates the principles of nanopore single-molecule chemistry, highlighting breakthroughs in chemically reactive nanopore construction via site-specific mutagenesis, semisynthetic engineering, and orthogonal modifications. Notably, we highlight the innovative strategies enabling precise subunit stoichiometry control to ensure single-molecule reactions, and the integration of machine learning for high-fidelity ionic current analysis. These developments position nanopores as versatile tools for intricate molecular detection in fundamental and applied research. Looking forward, nanopore single-molecule chemistry promises an impact on diagnostics, environmental monitoring, and precision medicine. Integration of molecular dynamics simulations, artificial intelligence-driven protein design frameworks, and microsystems technology may expand detectable species, enhancing robustness and lowering detection limits. Such advancements will deepen our understanding of chemical transformations and support meaningful real-world applications of nanopore technologies.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"277-300"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146042149","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-02-10DOI: 10.1146/annurev-biophys-021424-011852
Miguel Antonio Aon, Sonia Cortassa
{"title":"Systems Biology of Aging, Metabolism, and Mitochondria.","authors":"Miguel Antonio Aon, Sonia Cortassa","doi":"10.1146/annurev-biophys-021424-011852","DOIUrl":"10.1146/annurev-biophys-021424-011852","url":null,"abstract":"<p><p>Since the beginning of this century, the emergence of systems biology, driven by technological, informatic, and theoretical advances, has led to an unprecedented generation of data and information about biological systems at multiple levels of organization. We now have access not only to components of living systems but also to some of the underlying principles governing their organization within networks. This review focuses on the systems biology of aging, metabolism, and mitochondria, along with the integration of experimental and computational systems biology approaches as applied to multilayered biological networks, spanning from the molecular-subcellular to the whole organism. Sections 2 and 3 provide an overview of the insights gained from systems biology and multi-omics approaches as applied to aging and metabolism. Using the spatiotemporal dynamics of biological networks as a unifying thread, Sections 4 and 5 explore how systems biology and current methods can leverage the understanding of complex biological phenomena through integrated experimental-computational strategies, utilizing iterative, verification-validation loops between experiments and models. Section 6 concludes by highlighting the autonomously dynamic, self-organizing, and self-regulating integrative nature of living systems and the need to address these properties at the emerging convergence of biology, medicine, physics, and powerful computational technologies that include artificial intelligence.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"443-467"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146159169","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-01-02DOI: 10.1146/annurev-biophys-021424-011728
Francesca W van Tartwijk, Liuba Dvinskikh, Edward N Ward, Meng Lu, Clemens F Kaminski
{"title":"Imaging Dynamic Subcellular Organization at High Spatiotemporal Resolution.","authors":"Francesca W van Tartwijk, Liuba Dvinskikh, Edward N Ward, Meng Lu, Clemens F Kaminski","doi":"10.1146/annurev-biophys-021424-011728","DOIUrl":"10.1146/annurev-biophys-021424-011728","url":null,"abstract":"<p><p>The spatiotemporal organization of intracellular compartments is fundamental to cellular function and to the understanding of the processes underpinning health and disease. Fluorescence microscopy offers a powerful means to observe organelle morphology and dynamics with high specificity. However, no single technique can capture the wide range of relevant spatiotemporal scales due to inherent trade-offs in resolution, speed, field of view, signal-to-noise ratio, and sample viability. In this review, we describe recent developments across high-resolution fluorescence microscopy techniques and associated computational methods, critically evaluating how these advances address key limitations. Through biological examples of organelle dynamics at different scales, we illustrate the impact of these technologies on our understanding of cellular organization and function. Finally, we discuss the current challenges and outline future directions for imaging-based research, highlighting the potential for further innovations to deepen insights into dynamic subcellular processes.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"157-175"},"PeriodicalIF":13.7,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145893065","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}
Annual Review of BiophysicsPub Date : 2026-05-01Epub Date: 2026-02-05DOI: 10.1146/annurev-biophys-030722-113838
Susovan Roy Chowdhury, Randall H Goldsmith, Baron Chanda
{"title":"Ligand Binding Dynamics of Ion Channels and GPCRs Using Single-Molecule Fluorescence.","authors":"Susovan Roy Chowdhury, Randall H Goldsmith, Baron Chanda","doi":"10.1146/annurev-biophys-030722-113838","DOIUrl":"10.1146/annurev-biophys-030722-113838","url":null,"abstract":"<p><p>Chemical signaling underlies many biological processes, and membrane receptors such as G protein-coupled receptors and ligand-gated ion channels represent two of the most pharmacologically important protein families. Advances in single-molecule fluorescence techniques have transformed our understanding of molecular mechanisms, including protein folding, transcription, and ligand binding. Unlike ensemble measurements, which average over populations and obscure molecular heterogeneity, single-molecule approaches enable direct observation of individual events, revealing rare conformational states and distinguishing between mechanisms that are indistinguishable at the ensemble level. This review highlights how single-molecule fluorescence resonance energy transfer (smFRET) and single-molecule fluorescence ligand binding (smFLiB) provide complementary insights into ligand-dependent receptor activation and allosteric coupling. smFRET offers structural information by tracking conformational transitions, but limited observation times can hinder detection of slow or infrequent events. In contrast, smFLiB allows long-duration monitoring of ligand-receptor interactions throughout the activation pathway, though with less direct information about structural rearrangements. Through selected case studies, we illustrate how these techniques have been applied to dissect the complexity of ligand-receptor interactions with unprecedented resolution. These advances hold promise for guiding the rational design of more selective and effective therapeutics targeting membrane proteins.</p>","PeriodicalId":50756,"journal":{"name":"Annual Review of Biophysics","volume":" ","pages":"343-364"},"PeriodicalIF":12.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13485122/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146127394","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}