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| | {{STRUCTURE_2h1f| PDB=2h1f | SCENE= }} | | {{STRUCTURE_2h1f| PDB=2h1f | SCENE= }} |
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| - | '''E. coli heptosyltransferase WaaC with ADP'''
| + | ===E. coli heptosyltransferase WaaC with ADP=== |
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| - | ==Overview==
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| - | Lipopolysaccharides constitute the outer leaflet of the outer membrane of Gram-negative bacteria and are therefore essential for cell growth and viability. The heptosyltransferase WaaC is a glycosyltransferase (GT) involved in the synthesis of the inner core region of LPS. It catalyzes the addition of the first L-glycero-D-manno-heptose (heptose) molecule to one 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo) residue of the Kdo2-lipid A molecule. Heptose is an essential component of the LPS core domain; its absence results in a truncated lipopolysaccharide associated with the deep-rough phenotype causing a greater susceptibility to antibiotic and an attenuated virulence for pathogenic Gram-negative bacteria. Thus, WaaC represents a promising target in antibacterial drug design. Here, we report the structure of WaaC from the Escherichia coli pathogenic strain RS218 alone at 1.9 A resolution, and in complex with either ADP or the non-cleavable analog ADP-2-deoxy-2-fluoro-heptose of the sugar donor at 2.4 A resolution. WaaC adopts the GT-B fold in two domains, characteristic of one glycosyltransferase structural superfamily. The comparison of the three different structures shows that WaaC does not undergo a domain rotation, characteristic of the GT-B family, upon substrate binding, but allows the substrate analog and the reaction product to adopt remarkably distinct conformations inside the active site. In addition, both binary complexes offer a close view of the donor subsite and, together with results from site-directed mutagenesis studies, provide evidence for a model of the catalytic mechanism.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_16963083}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 16963083 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_16963083}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Vongsouthi, V.]] | | [[Category: Vongsouthi, V.]] |
| | [[Category: Gt-b fold absence of c-terminal alpha-helix]] | | [[Category: Gt-b fold absence of c-terminal alpha-helix]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:45:25 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 21:35:46 2008'' |
Revision as of 18:35, 28 July 2008
Template:STRUCTURE 2h1f
E. coli heptosyltransferase WaaC with ADP
Template:ABSTRACT PUBMED 16963083
About this Structure
2H1F is a Single protein structure of sequence from Escherichia coli o6. Full crystallographic information is available from OCA.
Reference
Structure of the Escherichia coli heptosyltransferase WaaC: binary complexes with ADP and ADP-2-deoxy-2-fluoro heptose., Grizot S, Salem M, Vongsouthi V, Durand L, Moreau F, Dohi H, Vincent S, Escaich S, Ducruix A, J Mol Biol. 2006 Oct 20;363(2):383-94. Epub 2006 Jul 29. PMID:16963083
Page seeded by OCA on Mon Jul 28 21:35:46 2008
