1fmz

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[[Image:1fmz.jpg|left|200px]]
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{{Seed}}
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[[Image:1fmz.png|left|200px]]
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{{STRUCTURE_1fmz| PDB=1fmz | SCENE= }}
{{STRUCTURE_1fmz| PDB=1fmz | SCENE= }}
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'''CRYSTAL STRUCTURE OF A MUTANT WINGED BEAN CHYMOTRYPSIN INHIBITOR PROTEIN, N14K.'''
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===CRYSTAL STRUCTURE OF A MUTANT WINGED BEAN CHYMOTRYPSIN INHIBITOR PROTEIN, N14K.===
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==Overview==
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A double-headed chymotrypsin inhibitor, WCI, from winged bean seeds was cloned for structural and biochemical studies. The inhibitor was subjected to two point mutations at a conserved position, Asn14. This residue, known to have a pivotal role in stabilizing the first reactive-site loop (Gln63-Phe68) of the inhibitor, is highly conserved in the sequences of the other members of Kunitz (STI) family as well as in the sequences of Kazal family of serine protease inhibitors. The mutants, N14K and N14D, were subjected to biochemical assay and their characteristics were compared with those of the recombinant inhibitor (rWCI). Crystallographic studies of the recombinant and the mutant proteins are discussed. These studies were primarily aimed at understanding the importance of the protein scaffolding towards the conformational rigidity of the reactive-site loop. Our analysis reveals that, as the Lys14 side chain takes an unusual fold in N14K and the Asp14 side chain in N14D interacts with the loop residues by water-mediated hydrogen bonds, the canonical conformation of the loop has remained effectively intact in both the mutant structures. However, minor alterations such as a 2-fold increase in the inhibitory affinity towards the cognate enzyme were observed.
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The line below this paragraph, {{ABSTRACT_PUBMED_11438758}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 11438758 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11438758}}
==About this Structure==
==About this Structure==
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[[Category: Ravichandran, S.]]
[[Category: Ravichandran, S.]]
[[Category: Beta trefoil]]
[[Category: Beta trefoil]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:31:12 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 03:33:33 2008''

Revision as of 00:33, 1 July 2008

Image:1fmz.png

Template:STRUCTURE 1fmz

CRYSTAL STRUCTURE OF A MUTANT WINGED BEAN CHYMOTRYPSIN INHIBITOR PROTEIN, N14K.

Template:ABSTRACT PUBMED 11438758

About this Structure

1FMZ is a Single protein structure of sequence from Psophocarpus tetragonolobus. Full crystallographic information is available from OCA.

Reference

The role of Asn14 in the stability and conformation of the reactive-site loop of winged bean chymotrypsin inhibitor: crystal structures of two point mutants Asn14-->Lys and Asn14-->Asp., Ravichandran S, Dasgupta J, Chakrabarti C, Ghosh S, Singh M, Dattagupta JK, Protein Eng. 2001 May;14(5):349-57. PMID:11438758

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