1jyf
From Proteopedia
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Structure of the Dimeric Lac Repressor with an 11-residue C-terminal Deletion.
Overview
A single amino acid substitution, K84L, in the Escherichia coli lac, repressor produces a protein that has substantially increased stability, compared to wild-type. However, despite the increased stability, this, altered tetrameric repressor has a tenfold reduced affinity for operator, and greatly decreased rate-constants of inducer binding as well as a, reduced phenotypic response to inducer in vivo. To understand the dramatic, increase in stability and altered functional properties, we have, determined the X-ray crystal structures of a dimeric repressor with and, without the K84L substitution at resolutions of 1.7 and 3.0 A, respectively. In the wild-type dimer, K84-11, Lys84 forms electrostatic, interactions at the monomer-monomer interface and is partially exposed to, solvent. In the K84L-11 substituted protein there is reorientation of the, N-subdomains, which allows the leucine to become deeply buried at the, monomer-monomer interface. This reorientation of the N-subdomains, in, turn, results in an alteration of hydrogen bonding, ion pairing, and van, der Waals interactions at the monomer-monomer interface. The lysine, residue at position 84 appears to exert its key effects by destabilizing, the "optimal" conformation of the repressor, effectively loosening the, dimer interface and allowing the repressor to adopt the conformations, necessary to function as a molecular switch.
About this Structure
1JYF is a Single protein structure of sequence from Escherichia coli with GOL as ligand. Full crystallographic information is available from OCA.
Reference
Structure of a variant of lac repressor with increased thermostability and decreased affinity for operator., Bell CE, Barry J, Matthews KS, Lewis M, J Mol Biol. 2001 Oct 12;313(1):99-109. PMID:11601849
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