2f4k: Difference between revisions
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{{STRUCTURE_2f4k| PDB=2f4k | SCENE= }} | |||
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'''Chicken villin subdomain HP-35, K65(NLE), N68H, K70(NLE), PH9''' | '''Chicken villin subdomain HP-35, K65(NLE), N68H, K70(NLE), PH9''' | ||
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==About this Structure== | ==About this Structure== | ||
2F4K is a [[Single protein]] structure | 2F4K is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F4K OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Hofrichter, J.]] | [[Category: Hofrichter, J.]] | ||
[[Category: Kubelka, J.]] | [[Category: Kubelka, J.]] | ||
[[Category: | [[Category: Villin head group subdomain]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 03:27:09 2008'' | |||
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Revision as of 03:27, 4 May 2008
Chicken villin subdomain HP-35, K65(NLE), N68H, K70(NLE), PH9
OverviewOverview
We have investigated the structure, equilibria, and folding kinetics of an engineered 35-residue subdomain of the chicken villin headpiece, an ultrafast-folding protein. Substitution of two buried lysine residues by norleucine residues stabilizes the protein by 1 kcal/mol and increases the folding rate sixfold, as measured by nanosecond laser T-jump. The folding rate at 300 K is (0.7 micros)(-1) with little or no temperature dependence, making this protein the first sub-microsecond folder, with a rate only twofold slower than the theoretically predicted speed limit. Using the 70 ns process to obtain the effective diffusion coefficient, the free energy barrier height is estimated from Kramers theory to be less than approximately 1 kcal/mol. X-ray crystallographic determination at 1A resolution shows no significant change in structure compared to the single-norleucine-substituted molecule and suggests that the increased stability is electrostatic in origin. The ultrafast folding rate, very accurate X-ray structure, and small size make this engineered villin subdomain an ideal system for simulation by atomistic molecular dynamics with explicit solvent.
About this StructureAbout this Structure
2F4K is a Single protein structure. Full crystallographic information is available from OCA.
ReferenceReference
Sub-microsecond protein folding., Kubelka J, Chiu TK, Davies DR, Eaton WA, Hofrichter J, J Mol Biol. 2006 Jun 9;359(3):546-53. Epub 2006 Mar 31. PMID:16643946 Page seeded by OCA on Sun May 4 03:27:09 2008