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3sic

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[[Image:3sic.jpg|left|200px]]
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{{STRUCTURE_3sic| PDB=3sic | SCENE= }}
{{STRUCTURE_3sic| PDB=3sic | SCENE= }}
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'''MOLECULAR RECOGNITION AT THE ACTIVE SITE OF SUBTILISIN BPN': CRYSTALLOGRAPHIC STUDIES USING GENETICALLY ENGINEERED PROTEINACEOUS INHIBITOR SSI (STREPTOMYCES SUBTILISIN INHIBITOR)'''
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===MOLECULAR RECOGNITION AT THE ACTIVE SITE OF SUBTILISIN BPN': CRYSTALLOGRAPHIC STUDIES USING GENETICALLY ENGINEERED PROTEINACEOUS INHIBITOR SSI (STREPTOMYCES SUBTILISIN INHIBITOR)===
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==Overview==
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Unlike trypsin-like serine proteases having only one conspicuous binding pocket in the active site, subtilisin BPN' has two such pockets, the S1 and S4 pockets, which accommodate the P1 and P4 residues of ligands (after Schechter and Berger notation) respectively. Using computer graphics, the geometrical nature of the two pockets was carefully examined and strategies for site-directed mutagenesis studies were set up against a protein SSI (Streptomyces subtilisin inhibitor), which is a strong proteinaceous inhibitor (or a substrate analogue) of subtilisin BPN'. It was decided to convert the P1 residue, methionine 73, into lysine (M73K) with or without additional conversion of the P4 residue, methionine 70, into glycine (M70G). The crystal structures of the two complexes of subtilisin BPN', one with the single mutant SSI (M73K) and the other with the double mutant SSI (M73K, M70G) were solved showing that (i) small 'electrostatic induced-fit movement' occurs in the S1 pocket upon introducing the terminal plus charge of the lysine side chain, and (ii) large 'mechanical induced-fit movement' occurs in the S4 pocket upon reducing the size of the P4 side chain from methionine to glycine. In both (i) and (ii), the induced-fit movement occurred in a concerted fashion involving both the enzyme and 'substrate' amino acid residues. The term 'substrate-assisted stabilization' was coined to stress the cooperative nature of the induced-fit movements.
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(as it appears on PubMed at http://www.pubmed.gov), where 1891457 is the PubMed ID number.
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{{ABSTRACT_PUBMED_1891457}}
==About this Structure==
==About this Structure==
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[[Category: Nakamura, K T.]]
[[Category: Nakamura, K T.]]
[[Category: Takeuchi, Y.]]
[[Category: Takeuchi, Y.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:07:14 2008''

Revision as of 10:07, 3 July 2008

Image:3sic.png

Template:STRUCTURE 3sic

MOLECULAR RECOGNITION AT THE ACTIVE SITE OF SUBTILISIN BPN': CRYSTALLOGRAPHIC STUDIES USING GENETICALLY ENGINEERED PROTEINACEOUS INHIBITOR SSI (STREPTOMYCES SUBTILISIN INHIBITOR)

Template:ABSTRACT PUBMED 1891457

About this Structure

3SIC is a Protein complex structure of sequences from Bacillus amyloliquefaciens. Full crystallographic information is available from OCA.

Reference

Molecular recognition at the active site of subtilisin BPN': crystallographic studies using genetically engineered proteinaceous inhibitor SSI (Streptomyces subtilisin inhibitor)., Takeuchi Y, Noguchi S, Satow Y, Kojima S, Kumagai I, Miura K, Nakamura KT, Mitsui Y, Protein Eng. 1991 Jun;4(5):501-8. PMID:1891457

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