{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T17:43:42Z","timestamp":1776102222836,"version":"3.50.1"},"update-to":[{"DOI":"10.1371\/journal.pcbi.1008355","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2020,11,9]],"date-time":"2020-11-09T00:00:00Z","timestamp":1604880000000}}],"reference-count":84,"publisher":"Public Library of Science (PLoS)","issue":"10","license":[{"start":{"date-parts":[[2020,10,28]],"date-time":"2020-10-28T00:00:00Z","timestamp":1603843200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000057","name":"National Institute of General Medical Sciences","doi-asserted-by":"publisher","award":["R01-GM123169"],"award-info":[{"award-number":["R01-GM123169"]}],"id":[{"id":"10.13039\/100000057","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.ploscompbiol.org"],"crossmark-restriction":false},"short-container-title":["PLoS Comput Biol"],"abstract":"<jats:p>In Gram-negative bacteria, the folding and insertion of \u03b2-barrel outer membrane proteins (OMPs) to the outer membrane are mediated by the \u03b2-barrel assembly machinery (BAM) complex. Two leading models of this process have been put forth: the hybrid barrel model, which claims that a lateral gate in BamA\u2019s \u03b2-barrel can serve as a template for incoming OMPs, and the passive model, which claims that a thinned membrane near the lateral gate of BamA accelerates spontaneous OMP insertion. To examine the key elements of these two models, we have carried out 45.5 \u03bcs of equilibrium molecular dynamics simulations of BamA with and without POTRA domains from<jats:italic>Escherichia coli<\/jats:italic>,<jats:italic>Salmonella enterica<\/jats:italic>,<jats:italic>Haemophilus ducreyi<\/jats:italic>and<jats:italic>Neisseria gonorrhoeae<\/jats:italic>, together with BamA\u2019s homolog, TamA from<jats:italic>E. coli<\/jats:italic>, in their native, species-specific outer membranes. In these equilibrium simulations, we consistently observe membrane thinning near the lateral gate for all proteins. We also see occasional spontaneous lateral gate opening and sliding of the \u03b2-strands at the gate interface for<jats:italic>N. gonorrhoeae<\/jats:italic>, indicating that the gate is dynamic. An additional 14 \u03bcs of free-energy calculations shows that the energy necessary to open the lateral gate in BamA\/TamA varies by species, but is always lower than the Omp85 homolog, FhaC. Our combined results suggest OMP insertion utilizes aspects of both the hybrid barrel and passive models.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1008355","type":"journal-article","created":{"date-parts":[[2020,10,28]],"date-time":"2020-10-28T17:53:35Z","timestamp":1603907615000},"page":"e1008355","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":40,"title":["Membrane thinning and lateral gating are consistent features of BamA across multiple species"],"prefix":"10.1371","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2217-1233","authenticated-orcid":true,"given":"Jinchan","family":"Liu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1510-7842","authenticated-orcid":true,"given":"James 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