2lnv
Solution structure of GspC-HR of typeII secretion systemSolution structure of GspC-HR of typeII secretion system
Structural highlights
Function[GSPC2_DICD3] Involved in a type II secretion system (T2SS, formerly general secretion pathway, GSP) for the export of proteins. Required for the translocation of the multiple pectic enzymes. Publication Abstract from PubMedThe type II secretion system of Gram-negative bacteria is important for bacterial pathogenesis and survival; it is composed of 12 mostly multimeric core proteins, which build a sophisticated secretion machine spanning both bacterial membranes. OutC is the core component of the inner membrane subcomplex thought to be involved in both recognition of substrate and interaction with the outer membrane secretin OutD. Here, we report the solution structure of the HR domain of OutC and explore its interaction with the secretin. The HR domain adopts a beta-sandwich-like fold consisting of two beta-sheets each composed of three anti-parallel beta-strands. This structure is strikingly similar to the periplasmic region of PilP, an inner membrane lipoprotein from the type IV pilus system highlighting the common evolutionary origin of these two systems and showing that all the core components of the type II secretion system have a structural or sequence ortholog within the type IV pili system. The HR domain is shown to interact with the N0 domain of the secretin. The importance of this interaction is explored in the context of the functional secretion system. Solution Structure of Homology Region (HR) Domain of Type II Secretion System.,Gu S, Kelly G, Wang X, Frenkiel T, Shevchik VE, Pickersgill RW J Biol Chem. 2012 Mar 16;287(12):9072-80. Epub 2012 Jan 17. PMID:22253442[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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