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1h4w

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{{STRUCTURE_1h4w| PDB=1h4w | SCENE= }}
{{STRUCTURE_1h4w| PDB=1h4w | SCENE= }}
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'''STRUCTURE OF HUMAN TRYPSIN IV (BRAIN TRYPSIN)'''
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===STRUCTURE OF HUMAN TRYPSIN IV (BRAIN TRYPSIN)===
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==Overview==
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Severe neurodegradative brain diseases, like Alzheimer, are tightly linked with proteolytic activity in the human brain. Proteinases expressed in the brain, such as human trypsin IV, are likely to be involved in the pathomechanism of these diseases. The observation of amyloid formed in the brain of transgenic mice expressing human trypsin IV supports this hypothesis. Human trypsin IV is also resistant towards all studied naturally occurring polypeptide inhibitors. It has been postulated that the substitution of Gly193 to arginine is responsible for this inhibitor resistance. Here we report the X-ray structure of human trypsin IV in complex with the inhibitor benzamidine at 1.7 A resolution. The overall fold of human trypsin IV is similar to human trypsin I, with a root-mean square deviation of only 0.5 A for all C(alpha) positions. The crystal structure reveals the orientation of the side-chain of Arg193, which occupies an extended conformation and fills the S2' subsite. An analysis of surface electrostatic potentials shows an unusually strong clustering of positive charges around the primary specificity pocket, to which the side-chain of Arg193 also contributes. These unique features of the crystal structure provide a structural basis for the enhanced inhibitor resistance, and enhanced substrate restriction, of human trypsin IV.
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(as it appears on PubMed at http://www.pubmed.gov), where 11827488 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11827488}}
==About this Structure==
==About this Structure==
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[[Category: Serine protease]]
[[Category: Serine protease]]
[[Category: Signal transduction]]
[[Category: Signal transduction]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:26:06 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:37:49 2008''

Revision as of 03:37, 1 July 2008

Image:1h4w.png

Template:STRUCTURE 1h4w

STRUCTURE OF HUMAN TRYPSIN IV (BRAIN TRYPSIN)

Template:ABSTRACT PUBMED 11827488

About this Structure

1H4W is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure reveals basis for the inhibitor resistance of human brain trypsin., Katona G, Berglund GI, Hajdu J, Graf L, Szilagyi L, J Mol Biol. 2002 Feb 1;315(5):1209-18. PMID:11827488

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