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1uck

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{{STRUCTURE_1uck| PDB=1uck | SCENE= }}
{{STRUCTURE_1uck| PDB=1uck | SCENE= }}
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'''Mutants of RNase Sa'''
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===Mutants of RNase Sa===
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==Overview==
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We previously suggested that proteins gain more stability from the burial and hydrogen bonding of polar groups than from the burial of nonpolar groups (Pace, C. N. (2001) Biochemistry 40, 310-313). To study this further, we prepared eight Thr-to-Val mutants of RNase Sa, four in which the Thr side chain is hydrogen-bonded and four in which it is not. We measured the stability of these mutants by analyzing their thermal denaturation curves. The four hydrogen-bonded Thr side chains contribute 1.3 +/- 0.9 kcal/mol to the stability; those that are not still contribute 0.4 +/- 0.9 kcal/mol to the stability. For 40 Thr-to-Val mutants of 11 proteins, the average decrease in stability is 1.0 +/- 1.0 kcal/mol when the Thr side chain is hydrogen-bonded and 0.0 +/- 0.5 kcal/mol when it is not. This is clear evidence that hydrogen bonds contribute favorably to protein stability. In addition, we prepared four Val-to-Thr mutants of RNase Sa, measured their stability, and determined their crystal structures. In all cases, the mutants are less stable than the wild-type protein, with the decreases in stability ranging from 0.5 to 4.4 kcal/mol. For 41 Val-to-Thr mutants of 11 proteins, the average decrease in stability is 1.8 +/- 1.3 kcal/mol and is unfavorable for 40 of 41 mutants. This shows that placing an [bond]OH group at a site designed for a [bond]CH3 group is very unfavorable. So, [bond]OH groups can contribute favorably to protein stability, even if they are not hydrogen-bonded, if the site was selected for an [bond]OH group, but they will make an unfavorable contribution to stability, even if they are hydrogen-bonded, when they are placed at a site selected for a [bond]CH3 group. The contribution that polar groups make to protein stability depends strongly on their environment.
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{{ABSTRACT_PUBMED_12799387}}
==About this Structure==
==About this Structure==
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[[Category: Hydrogen bond]]
[[Category: Hydrogen bond]]
[[Category: Protein stability]]
[[Category: Protein stability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 11:02:26 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:15:23 2008''

Revision as of 16:15, 27 July 2008

Image:1uck.png

Template:STRUCTURE 1uck

Mutants of RNase Sa

Template:ABSTRACT PUBMED 12799387

About this Structure

1UCK is a Single protein structure of sequence from Streptomyces aureofaciens. Full crystallographic information is available from OCA.

Reference

The contribution of polar group burial to protein stability is strongly context-dependent., Takano K, Scholtz JM, Sacchettini JC, Pace CN, J Biol Chem. 2003 Aug 22;278(34):31790-5. Epub 2003 Jun 10. PMID:12799387

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