The E. coli c3393 protein is a component of the type VI secretion system and exhibits structural similarity to T4 bacteriophage tail proteins gp27 and gp5
2p5z is a 1 chain structure with sequence from Escherichia coli o6. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Protein secretion is a common property of pathogenic microbes. Gram-negative bacterial pathogens use at least 6 distinct extracellular protein secretion systems to export proteins through their multilayered cell envelope and in some cases into host cells. Among the most widespread is the newly recognized Type VI secretion system (T6SS) which is composed of 15-20 proteins whose biochemical functions are not well understood. Using crystallographic, biochemical, and bioinformatic analyses, we identified 3 T6SS components, which are homologous to bacteriophage tail proteins. These include the tail tube protein; the membrane-penetrating needle, situated at the distal end of the tube; and another protein associated with the needle and tube. We propose that T6SS is a multicomponent structure whose extracellular part resembles both structurally and functionally a bacteriophage tail, an efficient machine that translocates proteins and DNA across lipid membranes into cells.
Type VI secretion apparatus and phage tail-associated protein complexes share a common evolutionary origin.,Leiman PG, Basler M, Ramagopal UA, Bonanno JB, Sauder JM, Pukatzki S, Burley SK, Almo SC, Mekalanos JJ Proc Natl Acad Sci U S A. 2009 Mar 17;106(11):4154-9. Epub 2009 Feb 27. PMID:19251641[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑Leiman PG, Basler M, Ramagopal UA, Bonanno JB, Sauder JM, Pukatzki S, Burley SK, Almo SC, Mekalanos JJ. Type VI secretion apparatus and phage tail-associated protein complexes share a common evolutionary origin. Proc Natl Acad Sci U S A. 2009 Mar 17;106(11):4154-9. Epub 2009 Feb 27. PMID:19251641
