{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T15:23:47Z","timestamp":1786116227026,"version":"build-2736575974"},"reference-count":160,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Australian Research Council (ARC) Centre of Excellence in Quantum Biotechnology","award":["CE230100021"],"award-info":[{"award-number":["CE230100021"]}]},{"name":"ARC Future Fellowship","award":["FT200100401"],"award-info":[{"award-number":["FT200100401"]}]},{"award":["FT200100401"],"award-info":[{"award-number":["FT200100401"]}],"id":[{"id":"https:\/\/ror.org\/054x00070","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Jacob Haimson Beverly Mecklenburg Lectureship"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>Fluorescence correlation spectroscopy (FCS) measures spontaneous temporal fluorescence fluctuations within a femtolitre observation volume to extract, with single-molecule sensitivity, the concentration, mobility, oligomeric state, and interactions of proteins in living cells. This review traces how FCS and its spatiotemporal derivatives, implemented on different types of optical microscopes, have mapped protein trafficking across the three physically distinct environments a protein must navigate from the cell surface to its genomic targets. At the plasma membrane, FCS resolves nanodomains with millisecond confinement times and distinguishes cytoskeletal corralling from cholesterol-dependent trapping through the FCS diffusion law, revealing how receptor signalling is organised below the diffraction limit. In the cytoplasm, FCS quantifies how macromolecular crowding slows protein diffusion by a factor of 3\u20134 relative to water, drives anomalous sub-diffusion, and coexists with directed transport, while resolving the markedly slower dynamics of liquid\u2013liquid phase-separated condensates. In the nucleus, FCS-derived pair correlation and brightness analyses show that chromatin acts as a size-selective filter where an inert protein dimer can take more than 10-fold longer than its monomer to traverse the same nuclear distance, and that this oligomeric-state-dependent gating governs the genomic access of transcription factors. Across all three compartments, a protein\u2019s diffusive behaviour is not incidental to its function but is itself a direct readout of the physical organisation of its environment, establishing FCS as a uniquely quantitative bridge between molecular dynamics and cellular decision-making.<\/jats:p>","DOI":"10.3390\/biom16081143","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T08:08:02Z","timestamp":1786003682000},"page":"1143","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mapping Protein Diffusion from the Plasma Membrane to the Nucleus: Insights from Fluorescence Correlation Spectroscopy"],"prefix":"10.3390","volume":"16","author":[{"given":"Zahra Nadia","family":"Saadatmand","sequence":"first","affiliation":[{"name":"La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC 3086, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1935-6659","authenticated-orcid":false,"given":"Nazanin","family":"Ghaderinejad","sequence":"additional","affiliation":[{"name":"School of Physics, University of Melbourne, Parkville, VIC 3010, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth","family":"Hinde","sequence":"additional","affiliation":[{"name":"School of Physics, University of Melbourne, Parkville, VIC 3010, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"493","DOI":"10.1038\/s41580-026-00947-3","article-title":"Subcellular localization as a driver of protein function","volume":"27","author":"Sigaeva","year":"2026","journal-title":"Nat. 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