217l

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[[Image:217l.jpg|left|200px]]
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{{Seed}}
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{{STRUCTURE_217l| PDB=217l | SCENE= }}
{{STRUCTURE_217l| PDB=217l | SCENE= }}
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'''STRUCTURAL BASIS OF ALPHA-HELIX PROPENSITY AT TWO SITES IN T4 LYSOZYME'''
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===STRUCTURAL BASIS OF ALPHA-HELIX PROPENSITY AT TWO SITES IN T4 LYSOZYME===
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==Overview==
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The propensity of an amino acid to form an alpha helix in a protein was determined by multiple amino substitutions at positions 44 and 131 in T4 lysozyme. These positions are solvent-exposed sites within the alpha helices that comprise, respectively, residues 39 to 50 and 126 to 134. Except for two acidic substitutions that may be involved in salt bridges, the changes in stability at the two sites agree well. The stability values also agree with those observed for corresponding amino acid substitutions in some model peptides. Thus, helix propensity values derived from model peptides can be applicable to proteins. Among the 20 naturally occurring amino acids, proline, glycine, and alanine each have a structurally unique feature that helps to explain their low or high helix propensities. For the remaining 17 amino acids, it appears that the side chain hydrophobic surface buried against the side of the helix contributes substantially to alpha helix propensity.
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(as it appears on PubMed at http://www.pubmed.gov), where 8503008 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8503008}}
==About this Structure==
==About this Structure==
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[[Category: Blaber, M.]]
[[Category: Blaber, M.]]
[[Category: Matthews, B W.]]
[[Category: Matthews, B W.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 18:19:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:17:22 2008''

Revision as of 14:17, 27 July 2008

Image:217l.png

Template:STRUCTURE 217l

STRUCTURAL BASIS OF ALPHA-HELIX PROPENSITY AT TWO SITES IN T4 LYSOZYME

Template:ABSTRACT PUBMED 8503008

About this Structure

217L is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

Reference

Structural basis of amino acid alpha helix propensity., Blaber M, Zhang XJ, Matthews BW, Science. 1993 Jun 11;260(5114):1637-40. PMID:8503008

Page seeded by OCA on Sun Jul 27 17:17:22 2008

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