biostudies-literatureWang XMedical Research Council19082-93https://www.ebi.ac.uk/biostudies/studies/S-EPMC3365941biostudies-literatureUnknown287(23)The type II secretion system (T2SS) secretes enzymes and toxins across the outer membrane of Gram-negative bacteria. The precise assembly of T2SS, which consists of at least 12 core-components called Gsp, remains unclear. The outer membrane secretin, GspD, forms the channels, through which folded proteins are secreted, and interacts with the inner membrane component, GspC. The periplasmic regions of GspC and GspD consist of several structural domains, HR(GspC) and PDZ(GspC), and N0(GspD) to N3(GspD), respectively, and recent structural and functional studies have proposed several interaction sites between these domains. We used cysteine mutagenesis and disulfide bonding analysis to investigate the organization of GspC and GspD protomers and to map their interaction sites within the secretiThe Journal of biological chemistryCysteine scanning mutagenesis and disulfide mapping analysis of arrangement of GspC and GspD protomers within the type 2 secretion system.PMC3365941MC_U117533887Shevchik VEGu SPineau CWang XPickersgill RWGuschinskaya NfalseCysteine scanning mutagenesis and disulfide mapping analysis of arrangement of GspC and GspD protomers within the type 2 secretion system.The type II secretion system (T2SS) secretes enzymes and toxins across the outer membrane of Gram-negative bacteria. The precise assembly of T2SS, which consists of at least 12 core-components called Gsp, remains unclear. The outer membrane secretin, GspD, forms the channels, through which folded proteins are secreted, and interacts with the inner membrane component, GspC. The periplasmic regions of GspC and GspD consist of several structural domains, HR(GspC) and PDZ(GspC), and N0(GspD) to N3(GspD), respectively, and recent structural and functional studies have proposed several interaction sites between these domains. We used cysteine mutagenesis and disulfide bonding analysis to investigate the organization of GspC and GspD protomers and to map their interaction sites within the secreti2012-01-01T00:00:00Z2012 Jun2026-04-30T17:50:12.307Z2019-03-27T00:54:05ZS-EPMC33659412252307610.1074/jbc.m112.34633810.1074/jbc.M112.346338