2pi8: Difference between revisions

Revision as of 08:50, 28 July 2008

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File:2pi8.png

Template:STRUCTURE 2pi8

Crystal structure of E. coli MltA with bound chitohexaoseCrystal structure of E. coli MltA with bound chitohexaose

Template:ABSTRACT PUBMED 17502382

About this StructureAbout this Structure

2PI8 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Structure of Escherichia coli Lytic transglycosylase MltA with bound chitohexaose: implications for peptidoglycan binding and cleavage., van Straaten KE, Barends TR, Dijkstra BW, Thunnissen AM, J Biol Chem. 2007 Jul 20;282(29):21197-205. Epub 2007 May 14. PMID:17502382

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-'''Crystal structure of E. coli MltA with bound chitohexaose'''
+===Crystal structure of E. coli MltA with bound chitohexaose===
-==Overview==
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-Crystal structures of an inactive mutant (D308A) of the lytic transglycosylase MltA from Escherichia coli have been determined in two different apo-forms, as well as in complex with the substrate analogue chitohexaose. The chitohexaose binds with all six saccharide residues in the active site groove, with an intact glycosidic bond at the bond cleavage center. Its binding induces a large reorientation of the two structural domains in MltA, narrowing the active site groove and allowing tight interactions of the oligosaccharide with residues from both domains. The structures identify residues in MltA with key roles in the binding and recognition of peptidoglycan and confirm that Asp-308 is the single catalytic residue, acting as a general acid/base. Moreover, the structures suggest that catalysis involves a high energy conformation of the scissile glycosidic linkage and that the putative oxocarbenium ion intermediate is stabilized by the dipole moment of a nearby alpha-helix.
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 ==About this Structure==
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 [[Category: Lytic transglycosylase]]
 [[Category: Protein-sugar complex]]
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