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1wdw

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[[Image:1wdw.gif|left|200px]]
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{{STRUCTURE_1wdw| PDB=1wdw | SCENE= }}
{{STRUCTURE_1wdw| PDB=1wdw | SCENE= }}
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'''Structural basis of mutual activation of the tryptophan synthase a2b2 complex from a hyperthermophile, Pyrococcus furiosus'''
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===Structural basis of mutual activation of the tryptophan synthase a2b2 complex from a hyperthermophile, Pyrococcus furiosus===
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==Overview==
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The three-dimensional structure of the bifunctional tryptophan synthase alpha(2)beta(2) complex from Pyrococcus furiosus was determined by crystallographic analysis. This crystal structure, with the structures of an alpha subunit monomer and a beta(2) subunit dimer that have already been reported, is the first structural set in which changes in structure that occur upon the association of the individual tryptophan synthase subunits were observed. To elucidate the structural basis of the stimulation of the enzymatic activity of each of the alpha and beta(2) subunits upon alpha(2)beta(2) complex formation, the conformational changes due to complex formation were analyzed in detail compared with the structures of the alpha monomer and beta(2) subunit dimer. The major conformational changes due to complex formation occurred in the region correlated with the catalytic function of the enzyme as follows. (1) Structural changes in the beta subunit were greater than those in the alpha subunit. (2) Large movements of A46 and L165 in the alpha subunit due to complex formation caused a more open conformation favoring the entry of the substrate at the alpha active site. (3) The major changes in the beta subunit were the broadening of a long tunnel through which the alpha subunit product (indole) is transferred to the beta active site and the opening of an entrance at the beta active site. (4) The changes in the conformations of both the alpha and beta subunits due to complex formation contributed to the stabilization of the subunit association, which is critical for the stimulation of the enzymatic activities.
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(as it appears on PubMed at http://www.pubmed.gov), where 16114878 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16114878}}
==About this Structure==
==About this Structure==
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[[Category: Rsgi]]
[[Category: Rsgi]]
[[Category: Structural genomic]]
[[Category: Structural genomic]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:30:58 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 15:19:09 2008''

Revision as of 12:19, 27 July 2008

Image:1wdw.png

Template:STRUCTURE 1wdw

Structural basis of mutual activation of the tryptophan synthase a2b2 complex from a hyperthermophile, Pyrococcus furiosus

Template:ABSTRACT PUBMED 16114878

About this Structure

1WDW is a Protein complex structure of sequences from Pyrococcus furiosus. Full crystallographic information is available from OCA.

Reference

Conformational Changes in the tryptophan synthase from a hyperthermophile upon alpha2beta2 complex formation: crystal structure of the complex., Lee SJ, Ogasahara K, Ma J, Nishio K, Ishida M, Yamagata Y, Tsukihara T, Yutani K, Biochemistry. 2005 Aug 30;44(34):11417-27. PMID:16114878

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