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2r5o

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{{STRUCTURE_2r5o| PDB=2r5o | SCENE= }}
{{STRUCTURE_2r5o| PDB=2r5o | SCENE= }}
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'''Crystal structure of the C-terminal domain of wzt'''
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===Crystal structure of the C-terminal domain of wzt===
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==Overview==
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ATP-binding-cassette (ABC) transporters are responsible for the export of a wide variety of cell-surface glycoconjugates in both Gram-positive and Gram-negative bacteria. These include the O-antigenic polysaccharide (O-PS) portion of lipopolysaccharide, a crucial virulence determinant in Gram-negative pathogens. O-PSs are synthesized by one of two fundamentally different pathways. Escherichia coli O serotypes O8 and O9a provide the prototype systems for studying O-PS export via ABC transporters. The transporter is composed of the transmembrane component Wzm and the nucleotide-binding component Wzt. Although the N-terminal domain of Wzt is a conventional ABC protein, the C-terminal domain of Wzt (C-Wzt) is a unique structural element that determines the specificity of the transporter for either the O8 or O9a O-PS. We show here that the two domains of Wzt can function when expressed as separate polypeptides; both are essential for export. In vitro, C-Wzt binds its cognate O-PS by recognizing a residue located at the nonreducing end of the polymer. The crystal structure of C-Wzt(O9a) is reported here and reveals a beta sandwich with an immunoglobulin-like topology that contains the O-PS-binding pocket. Substrate interactions with nucleotide-binding domains have been demonstrated in an ABC exporter previously. However, to our knowledge substrate binding by a discrete, cytoplasmic accessory domain in an extended nucleotide-binding domain polypeptide has not previously been demonstrated. Elucidation of the substrate-recognition system involved in O-PS export provides insight into the mechanism that coordinates polymer biosynthesis, termination, and export.
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(as it appears on PubMed at http://www.pubmed.gov), where 18032609 is the PubMed ID number.
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{{ABSTRACT_PUBMED_18032609}}
==About this Structure==
==About this Structure==
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[[Category: O antigen export]]
[[Category: O antigen export]]
[[Category: Transport protein]]
[[Category: Transport protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 16:17:34 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:59:47 2008''

Revision as of 08:59, 28 July 2008

Image:2r5o.png

Template:STRUCTURE 2r5o

Crystal structure of the C-terminal domain of wzt

Template:ABSTRACT PUBMED 18032609

About this Structure

2R5O is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Substrate binding by a bacterial ABC transporter involved in polysaccharide export., Cuthbertson L, Kimber MS, Whitfield C, Proc Natl Acad Sci U S A. 2007 Dec 4;104(49):19529-34. Epub 2007 Nov 21. PMID:18032609

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