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1dg4

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{{STRUCTURE_1dg4| PDB=1dg4 | SCENE= }}
{{STRUCTURE_1dg4| PDB=1dg4 | SCENE= }}
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'''NMR STRUCTURE OF THE SUBSTRATE BINDING DOMAIN OF DNAK IN THE APO FORM'''
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===NMR STRUCTURE OF THE SUBSTRATE BINDING DOMAIN OF DNAK IN THE APO FORM===
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==Overview==
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How substrate affinity is modulated by nucleotide binding remains a fundamental, unanswered question in the study of 70 kDa heat shock protein (Hsp70) molecular chaperones. We find here that the Escherichia coli Hsp70, DnaK, lacking the entire alpha-helical domain, DnaK(1-507), retains the ability to support lambda phage replication in vivo and to pass information from the nucleotide binding domain to the substrate binding domain, and vice versa, in vitro. We determined the NMR solution structure of the corresponding substrate binding domain, DnaK(393-507), without substrate, and assessed the impact of substrate binding. Without bound substrate, loop L3,4 and strand beta3 are in significantly different conformations than observed in previous structures of the bound DnaK substrate binding domain, leading to occlusion of the substrate binding site. Upon substrate binding, the beta-domain shifts towards the structure seen in earlier X-ray and NMR structures. Taken together, our results suggest that conformational changes in the beta-domain itself contribute to the mechanism by which nucleotide binding modulates substrate binding affinity.
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{{ABSTRACT_PUBMED_10742174}}
==About this Structure==
==About this Structure==
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1DG4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DG4 OCA].
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1DG4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DG4 OCA].
==Reference==
==Reference==
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[[Category: Dnak]]
[[Category: Dnak]]
[[Category: Substrate binding domain]]
[[Category: Substrate binding domain]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:49:06 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:01:43 2008''

Revision as of 20:01, 30 June 2008

Image:1dg4.png

Template:STRUCTURE 1dg4

NMR STRUCTURE OF THE SUBSTRATE BINDING DOMAIN OF DNAK IN THE APO FORM

Template:ABSTRACT PUBMED 10742174

About this Structure

1DG4 is a Single protein structure of sequence from Escherichia coli. Full experimental information is available from OCA.

Reference

Structural insights into substrate binding by the molecular chaperone DnaK., Pellecchia M, Montgomery DL, Stevens SY, Vander Kooi CW, Feng HP, Gierasch LM, Zuiderweg ER, Nat Struct Biol. 2000 Apr;7(4):298-303. PMID:10742174

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