Linked Life Data

20562303

Source:http://linkedlifedata.com/resource/pubmed/id/20562303

Statements in which the resource exists.
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pubmed-article:20562303pubmed:dateCreated2010-7-28lld:pubmed
pubmed-article:20562303pubmed:abstractTextThe accessory Sec (SecA2/Y2) systems of streptococci and staphylococci are dedicated to the transport of large serine-rich repeat (SRR) glycoproteins to the bacterial cell surface. The means by which the glycosylated preproteins are selectively recognized by the accessory Sec system have not been fully characterized. In Streptococcus gordonii, the SRR glycoprotein GspB has a 90-residue amino-terminal signal sequence that is essential for transport by SecA2/Y2 but is not sufficient to mediate the transport of heterologous proteins by this specialized transporter. We now report that a preprotein must remain at least partially unfolded prior to transport by the accessory Sec system. In addition, a region of approximately 20 residues from the amino-terminal end of mature GspB (the accessory Sec transport or AST domain) is essential for SecA2/Y2-dependent transport. The replacement of several AST domain residues with glycine strongly interferes with export, which suggests that a helical conformation may be important. Analysis of GspB variants with alterations in the AST domain, in combination with the results with a SecY2 variant, indicates that the AST domain is essential both for targeting to the SecA2/Y2 translocase and for initiating translocation through the SecY2 channel. The combined results suggest a unique mechanism that ensures the transport of a single substrate by the SecA2/Y2 system.lld:pubmed
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pubmed-article:20562303pubmed:dateRevised2011-7-22lld:pubmed
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