1ioc

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{{STRUCTURE_1ioc| PDB=1ioc | SCENE= }}
{{STRUCTURE_1ioc| PDB=1ioc | SCENE= }}
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'''CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME, EAEA-I56T'''
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===CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME, EAEA-I56T===
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==Overview==
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To understand the mechanism of amyloid fibril formation of a protein, we examined wild-type and three mutant human lysozymes containing both amyloidogenic and non-amyloidogenic proteins: I56T (amyloidogenic); EAEA, which has four additional residues (Glu-Ala-Glu-Ala-) at the N-terminus located on a beta-structure; and EAEA-I56T, which is an I56T mutant of EAEA. All formed amyloid-like fibrils through an in the increase contents of alpha-helix with increasing concentration of ethanol. The order of propensity for amyloid-like fibril formation in highly concentrated ethanol solution is EAEA-I56T &gt; EAEA &gt; I56T &gt; wild-type. This order is almost the reverse of the order of conformational stability of these proteins, wild-type &gt; EAEA &gt; I56T &gt; EAEA-I56T. The important views in this work are as follows. (i) Artificially modified proteins formed amyloid fibrils in vitro. This means that amyloid formation is a generic property of polypeptide chains. (ii) The amyloidogenic mutation Ile56 to Thr caused the destabilization and promoted fibril formation in the wild-type and EAEA human lysozymes, indicating that instability facilitates amyloid formation. (iii) The mutant protein EAEA human lysozyme had higher propensity for fibril formation than the amyloidogenic mutant protein, indicating that amyloid formation is controlled not only by stability but also by other factors. In this case, appending polypeptide chains to a beta-structure accelerated amyloid formation.
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{{ABSTRACT_PUBMED_12359083}}
==About this Structure==
==About this Structure==
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[[Category: Mutant]]
[[Category: Mutant]]
[[Category: Stability]]
[[Category: Stability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:13:05 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 13:40:41 2008''

Revision as of 10:40, 1 July 2008

Image:1ioc.png

Template:STRUCTURE 1ioc

CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME, EAEA-I56T

Template:ABSTRACT PUBMED 12359083

About this Structure

1IOC is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Elongation in a beta-structure promotes amyloid-like fibril formation of human lysozyme., Goda S, Takano K, Yamagata Y, Maki S, Namba K, Yutani K, J Biochem. 2002 Oct;132(4):655-61. PMID:12359083

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