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3rp2

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{{STRUCTURE_3rp2| PDB=3rp2 | SCENE= }}
{{STRUCTURE_3rp2| PDB=3rp2 | SCENE= }}
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'''THE STRUCTURE OF RAT MAST CELL PROTEASE II AT 1.9-ANGSTROMS RESOLUTION'''
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===THE STRUCTURE OF RAT MAST CELL PROTEASE II AT 1.9-ANGSTROMS RESOLUTION===
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==Overview==
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The structure of rat mast cell protease II (RMCP II), a serine protease with chymotrypsin-like primary specificity, has been determined to a nominal resolution of 1.9 A by single isomorphous replacement, molecular replacement, and restrained crystallographic refinement to a final R-factor of 0.191. There are two independent molecules of RMCP II in the asymmetric unit of the crystal. The rms deviation from ideal bond lengths is 0.016 A and from ideal bond angles is 2.7 degrees. The overall structure of RMCP II is extremely similar to that of chymotrypsin, but the largest differences between the two structures are clustered around the active-site region in a manner which suggests that the unusual substrate specificity of RMCP II is due to these changes. Unlike chymotrypsin, RMCP II has a deep cleft around the active site. An insertion of three residues between residues 35 and 41 of chymotrypsin, combined with concerted changes in sequence and a deletion near residue 61, allows residues 35-41 of RMCP II to adopt a conformation not seen in any other serine protease. Additionally, the loss of the disulfide bridge between residues 191 and 220 of chymotrypsin leads to the formation of an additional substrate binding pocket that we propose to interact with the P3 side chain of bound substrate. RMCP II is a member of a homologous subclass of serine proteases that are expressed by mast cells, neutrophils, lymphocytes, and cytotoxic T-cells. Thus, the structure of RMCP II forms a basis for an explanation of the unusual properties of other members of this class.
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(as it appears on PubMed at http://www.pubmed.gov), where 3233198 is the PubMed ID number.
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{{ABSTRACT_PUBMED_3233198}}
==About this Structure==
==About this Structure==
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[[Category: Weaver, L.]]
[[Category: Weaver, L.]]
[[Category: Serine proteinase]]
[[Category: Serine proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:05:45 2008''

Revision as of 10:05, 3 July 2008

Image:3rp2.png

Template:STRUCTURE 3rp2

THE STRUCTURE OF RAT MAST CELL PROTEASE II AT 1.9-ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 3233198

About this Structure

3RP2 is a Single protein structure of sequence from Rattus rattus. Full crystallographic information is available from OCA.

Reference

The structure of rat mast cell protease II at 1.9-A resolution., Remington SJ, Woodbury RG, Reynolds RA, Matthews BW, Neurath H, Biochemistry. 1988 Oct 18;27(21):8097-105. PMID:3233198

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