1omp: Difference between revisions

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[[Image:1omp.jpg|left|200px]]
{{Seed}}
[[Image:1omp.png|left|200px]]


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{{STRUCTURE_1omp|  PDB=1omp  |  SCENE=  }}  
{{STRUCTURE_1omp|  PDB=1omp  |  SCENE=  }}  


'''CRYSTALLOGRAPHIC EVIDENCE OF A LARGE LIGAND-INDUCED HINGE-TWIST MOTION BETWEEN THE TWO DOMAINS OF THE MALTODEXTRIN-BINDING PROTEIN INVOLVED IN ACTIVE TRANSPORT AND CHEMOTAXIS'''
===CRYSTALLOGRAPHIC EVIDENCE OF A LARGE LIGAND-INDUCED HINGE-TWIST MOTION BETWEEN THE TWO DOMAINS OF THE MALTODEXTRIN-BINDING PROTEIN INVOLVED IN ACTIVE TRANSPORT AND CHEMOTAXIS===




==Overview==
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The periplasmic maltodextrin binding protein of Escherichia coli serves as an initial receptor for the active transport of and chemotaxis toward maltooligosaccharides. The three-dimensional structure of the binding protein complexed with maltose has been previously reported [Spurlino, J. C., Lu, G.-Y., &amp; Quiocho, F. A. (1991) J. Biol. Chem. 266, 5202-5219]. Here we report the structure of the unliganded form of the binding protein refined to 1.8-A resolution. This structure, combined with that for the liganded form, provides the first crystallographic evidence that a major ligand-induced conformational change occurs in a periplasmic binding protein. The unliganded structure shows a rigid-body "hinge-bending" between the two globular domains by approximately 35 degrees, relative to the maltose-bound structure, opening the sugar binding site groove located between the two domains. In addition, there is an 8 degrees twist of one domain relative to the other domain. The conformational changes observed between this structure and the maltose-bound structure are consistent with current models of maltose/maltodextrin transport and maltose chemotaxis and solidify a mechanism for receptor differentiation between the ligand-free and ligand-bound forms in signal transduction.
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{{ABSTRACT_PUBMED_1420181}}


==About this Structure==
==About this Structure==
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[[Category: Sharff, A J.]]
[[Category: Sharff, A J.]]
[[Category: Periplasmic binding protein]]
[[Category: Periplasmic binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:58:53 2008''

Revision as of 23:58, 28 July 2008

File:1omp.png

Template:STRUCTURE 1omp

CRYSTALLOGRAPHIC EVIDENCE OF A LARGE LIGAND-INDUCED HINGE-TWIST MOTION BETWEEN THE TWO DOMAINS OF THE MALTODEXTRIN-BINDING PROTEIN INVOLVED IN ACTIVE TRANSPORT AND CHEMOTAXIS

Template:ABSTRACT PUBMED 1420181

About this Structure

1OMP is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystallographic evidence of a large ligand-induced hinge-twist motion between the two domains of the maltodextrin binding protein involved in active transport and chemotaxis., Sharff AJ, Rodseth LE, Spurlino JC, Quiocho FA, Biochemistry. 1992 Nov 10;31(44):10657-63. PMID:1420181

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