1qsq

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[[Image:1qsq.gif|left|200px]]
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{{Seed}}
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[[Image:1qsq.png|left|200px]]
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{{STRUCTURE_1qsq| PDB=1qsq | SCENE= }}
{{STRUCTURE_1qsq| PDB=1qsq | SCENE= }}
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'''CAVITY CREATING MUTATION'''
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===CAVITY CREATING MUTATION===
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==Overview==
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In an attempt to identify a systematic relation between the structure of a protein and its folding kinetics, the rate of folding was determined for 20 mutants of T4 lysozyme in which a bulky, buried, nonpolar wild-type residue (Leu, Ile, Phe, Val, or Met) was substituted with alanine. Methionine, which approximated the size of the original side chain but which is of different shape and flexibility, was also substituted at most of the same sites. Mutations that substantially destabilize the protein and are located in the carboxy-terminal domain generally slow the rate of folding. Destabilizing mutations in the amino-terminal domain, however, have little effect on the rate of folding. Mutations that have little effect on stability tend to have little effect on the rate, no matter where they are located. These results suggest that, at the rate-limiting step, elements of structure in the C-terminal domain are formed and have a structure similar to that of the fully folded protein. Consistent with this, two variants that somewhat increase the rate of folding (Phe104 --&gt; Met and Val149 --&gt; Met) are located within the carboxy-terminal domain and maintain or improve packing with very little perturbation of the wild-type structure.
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The line below this paragraph, {{ABSTRACT_PUBMED_10545167}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 10545167 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10545167}}
==About this Structure==
==About this Structure==
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[[Category: Protein folding]]
[[Category: Protein folding]]
[[Category: T4 lysozyme]]
[[Category: T4 lysozyme]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:39:45 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:51:26 2008''

Revision as of 11:51, 27 July 2008

Image:1qsq.png

Template:STRUCTURE 1qsq

CAVITY CREATING MUTATION

Template:ABSTRACT PUBMED 10545167

About this Structure

1QSQ is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

Reference

Methionine and alanine substitutions show that the formation of wild-type-like structure in the carboxy-terminal domain of T4 lysozyme is a rate-limiting step in folding., Gassner NC, Baase WA, Lindstrom JD, Lu J, Dahlquist FW, Matthews BW, Biochemistry. 1999 Nov 2;38(44):14451-60. PMID:10545167

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