201l

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[[Image:201l.jpg|left|200px]]
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{{Seed}}
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[[Image:201l.png|left|200px]]
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{{STRUCTURE_201l| PDB=201l | SCENE= }}
{{STRUCTURE_201l| PDB=201l | SCENE= }}
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'''HOW AMINO-ACID INSERTIONS ARE ALLOWED IN AN ALPHA-HELIX OF T4 LYSOZYME'''
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===HOW AMINO-ACID INSERTIONS ARE ALLOWED IN AN ALPHA-HELIX OF T4 LYSOZYME===
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==Overview==
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Studies of extant protein sequences indicate that amino-acid insertions and deletions are preferentially located in loop regions, which has traditionally been explained as the result of selection removing deleterious mutations within secondary structural elements from the population. But there is no a priori reason to discount the possibility that insertions within secondary structure could either be tolerated until compensatory mutations arise, or have effects that are propagated away from secondary structure into loops. Earlier studies have indicated that insertions are generally tolerated, although much less well within secondary structure elements than in loop regions. Here we show that amino-acid insertions in an alpha-helix of T4 lysozyme can be accepted in two different ways. In some cases the inserted amino acids are accommodated within the helix, leading to the translocation of wild-type residues from the helix to the preceding loop. In other cases the insertion causes a 'looping-out' in the first or last turn of the helix. The individual structural responses seem to be dominated by the maintenance of the interface between the helix and the rest of the protein.
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The line below this paragraph, {{ABSTRACT_PUBMED_8429913}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 8429913 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8429913}}
==About this Structure==
==About this Structure==
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[[Category: Heinz, D W.]]
[[Category: Heinz, D W.]]
[[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 18:17:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 11:48:28 2008''

Revision as of 08:48, 29 July 2008

Image:201l.png

Template:STRUCTURE 201l

HOW AMINO-ACID INSERTIONS ARE ALLOWED IN AN ALPHA-HELIX OF T4 LYSOZYME

Template:ABSTRACT PUBMED 8429913

About this Structure

201L is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

Reference

How amino-acid insertions are allowed in an alpha-helix of T4 lysozyme., Heinz DW, Baase WA, Dahlquist FW, Matthews BW, Nature. 1993 Feb 11;361(6412):561-4. PMID:8429913

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