2aac: Difference between revisions

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[[Image:2aac.jpg|left|200px]]
{{Seed}}
[[Image:2aac.png|left|200px]]


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{{STRUCTURE_2aac|  PDB=2aac  |  SCENE=  }}  
{{STRUCTURE_2aac|  PDB=2aac  |  SCENE=  }}  


'''ESCHERCHIA COLI GENE REGULATORY PROTEIN ARAC COMPLEXED WITH D-FUCOSE'''
===ESCHERCHIA COLI GENE REGULATORY PROTEIN ARAC COMPLEXED WITH D-FUCOSE===




==Overview==
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The crystal structure of the sugar-binding and dimerization domain of the Escherichia coli gene regulatory protein, AraC, has been determined in complex with the competitive inhibitor D-fucose at pH 5.5 to a resolution of 1.6 A. An in-depth analysis shows that the structural basis for AraC carbohydrate specificity arises from the precise arrangement of hydrogen bond-forming protein side-chains around the bound sugar molecule. van der Waals interactions also contribute to the epimeric and anomeric selectivity of the protein. The methyl group of D-fucose is accommodated by small side-chain movements in the sugar-binding site that result in a slight distortion in the positioning of the amino-terminal arm. A comparison of this structure with the 1.5 A structure of AraC complexed with L-arabinose at neutral pH surprisingly revealed very small structural changes between the two complexes. Based on solution data, we suspect that the low pH used to crystallize the fucose complex affected the structure, and speculate about the nature of the changes between pH 5.5 and neutral pH and their implications for gene regulation by AraC. A comparison with the structurally unrelated E. coli periplasmic sugar-binding proteins reveals that conserved features of carbohydrate recognition are present, despite a complete lack of structural similarity between the two classes of proteins, suggesting convergent evolution of carbohydrate binding.
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{{ABSTRACT_PUBMED_9367758}}


==About this Structure==
==About this Structure==
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[[Category: Jelly roll]]
[[Category: Jelly roll]]
[[Category: Transcription factor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 18:48:42 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 06:31:04 2008''

Revision as of 03:31, 29 July 2008

File:2aac.png

Template:STRUCTURE 2aac

ESCHERCHIA COLI GENE REGULATORY PROTEIN ARAC COMPLEXED WITH D-FUCOSE

Template:ABSTRACT PUBMED 9367758

About this Structure

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

Reference

The 1.6 A crystal structure of the AraC sugar-binding and dimerization domain complexed with D-fucose., Soisson SM, MacDougall-Shackleton B, Schleif R, Wolberger C, J Mol Biol. 1997 Oct 17;273(1):226-37. PMID:9367758

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