3blc | pdb_00003blc
Crystal structure of the periplasmic domain of the Escherichia Coli YIDC
Structural highlights
FunctionYIDC_ECOLI Inner membrane protein required for the insertion and/or proper folding and/or complex formation of integral inner membrane proteins. Involved in integration of membrane proteins that insert dependently and independently of the Sec translocase complex, as well as at least 2 lipoproteins. Its own insertion requires SRP and is Sec translocase-dependent. Essential for the integration of Sec-dependent subunit a of the F(0)ATP synthase, FtsQ and SecE proteins and for Sec-independent subunit c of the F(0)ATP synthase, M13 phage procoat and the N-terminus of leader peptidase Lep. Probably interacts directly with Sec-independent substrates. Sec-dependent protein FtsQ interacts first with SecY then subsequently with YidC. Sec-dependent LacY and MalF require YidC to acquire tertiary structure and stability, a chaperone-like function, but not for membrane insertion. Stable maltose transport copmplex formation (MalFGK(2)) also requires YidC. Partially complements a Streptococcus mutans yidC2 disruption mutant.[1] [2] [3] [4] [5] [6] [7] [8] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe essential bacterial membrane protein YidC facilitates insertion and assembly of proteins destined for integration into the inner membrane. It has homologues in both mitochondria and chloroplasts. Here we report the crystal structure of the Escherichia coli YidC major periplasmic domain (YidCECP1) at 2.5A resolution. This domain is present in YidC from Gram-negative bacteria and is more than half the size of the full-length protein. The structure reveals that YidCECP1 is made up of a large twisted beta-sandwich protein fold with a C-terminal alpha-helix that packs against one face of the beta-sandwich. Our structure and sequence analysis reveals that the C-terminal alpha-helix and the beta-sheet that it lays against are the most conserved regions of the domain. The region corresponding to the C-terminal alpha-helix was previously shown to be important for the protein insertase function of YidC and is conserved in other YidC-like proteins. The structure reveals that a region of YidC that was previously shown to be involved in binding to SecF maps to one edge of the beta-sandwich. Electrostatic analysis of the molecular surface for this region of YidC reveals a predominantly charged surface and suggests that the SecF-YidC interaction may be electrostatic in nature. Interestingly, YidCECP1 has significant structural similarity to galactose mutarotase from Lactococcus lactis, suggesting that this domain may have another function besides its role in membrane protein assembly. Crystal structure of the major periplasmic domain of the bacterial membrane protein assembly facilitator YidC.,Oliver DC, Paetzel M J Biol Chem. 2008 Feb 22;283(8):5208-16. Epub 2007 Dec 19. PMID:18093969[9] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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