1w4e: Difference between revisions

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[[Image:1w4e.gif|left|200px]]
{{Seed}}
[[Image:1w4e.png|left|200px]]


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{{STRUCTURE_1w4e|  PDB=1w4e  |  SCENE=  }}  
{{STRUCTURE_1w4e|  PDB=1w4e  |  SCENE=  }}  


'''PERIPHERAL-SUBUNIT BINDING DOMAINS FROM MESOPHILIC, THERMOPHILIC, AND HYPERTHERMOPHILIC BACTERIA FOLD BY ULTRAFAST, APPARENTLY TWO-STATE TRANSITIONS'''
===PERIPHERAL-SUBUNIT BINDING DOMAINS FROM MESOPHILIC, THERMOPHILIC, AND HYPERTHERMOPHILIC BACTERIA FOLD BY ULTRAFAST, APPARENTLY TWO-STATE TRANSITIONS===




==Overview==
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We have determined the solution structures, equilibrium properties and ultra-fast folding kinetics for three bacterial homologues of the peripheral subunit-binding domain (PSBD) family. The mesophilic homologue, BBL, was less stable than the thermophilic and hyper-thermophilic variants (E3BD and POB, respectively). The broad unfolding transitions of each PSBD, when probed by different techniques, were essentially superimposable, consistent with co-operative denaturation. Temperature-jump and continuous-flow fluorescence methods were used to measure the folding kinetics for E3BD, POB and BBL. E3BD folded fairly rapidly at 298K (folding half-time approximately 25 micros) and BBL and POB folded even faster (folding half-times approximately 3-5 micros). The variations in equilibrium and kinetic behaviour observed for the PSBD family resembles that of the homeodomain family, where the folding pattern changes from apparent two-state transitions to multi-state kinetics as the denatured state becomes more structured. The faster folding of POB may be a consequence of its higher propensity to form helical structure in the region corresponding to the folding nucleus of E3BD. The ultra-fast folding of BBL appears to be a consequence of residual structure in the denatured ensemble, as with engrailed homeodomain. We discuss issues concerning "one-state", downhill folding, and find no evidence for, and strong evidence against, it occurring in these PSBDs. The shorter construct used previously for BBL was destabilized significantly and the stability further perturbed by the introduction of fluorescent probes. Thermal titrations for 11 side-chains scattered around the protein, when probed by (13)C-NMR experiments, could be fit globally to a common co-operative transition.
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{{ABSTRACT_PUBMED_16168437}}


==About this Structure==
==About this Structure==
1W4E is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1W4E OCA].  
1W4E is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1W4E OCA].  


==Reference==
==Reference==
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[[Category: Transferase]]
[[Category: Transferase]]
[[Category: Ultrafast folding]]
[[Category: Ultrafast folding]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 13:08:24 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:49:10 2008''

Revision as of 04:49, 28 July 2008

File:1w4e.png

Template:STRUCTURE 1w4e

PERIPHERAL-SUBUNIT BINDING DOMAINS FROM MESOPHILIC, THERMOPHILIC, AND HYPERTHERMOPHILIC BACTERIA FOLD BY ULTRAFAST, APPARENTLY TWO-STATE TRANSITIONS

Template:ABSTRACT PUBMED 16168437

About this Structure

1W4E is a Single protein structure of sequence from Geobacillus stearothermophilus. Full experimental information is available from OCA.

Reference

Ultra-fast barrier-limited folding in the peripheral subunit-binding domain family., Ferguson N, Sharpe TD, Schartau PJ, Sato S, Allen MD, Johnson CM, Rutherford TJ, Fersht AR, J Mol Biol. 2005 Oct 21;353(2):427-46. PMID:16168437

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