1gbm
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| , resolution 2.28Å | |||||||
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| Ligands: | , , | ||||||
| Gene: | ALPHA-LYTIC PROTEASE PREPROENZ (Lysobacter enzymogenes) | ||||||
| Activity: | Alpha-lytic endopeptidase, with EC number 3.4.21.12 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
ALPHA-LYTIC PROTEASE WITH MET 190 REPLACED BY ALA COMPLEX WITH METHOXYSUCCINYL-ALA-ALA-PRO-PHENYLALANINE BORONIC ACID
OverviewOverview
Gly216 in the active site of the broadly specific MA190 mutant of alpha-lytic protease has been found to be remarkably tolerant of amino acid substitutions. Side-chains as large as Trp can be accommodated within the substrate-binding pocket without abolishing catalysis, and have major effects upon the substrate specificity of the enzyme. Kinetic characterization of eleven enzymatically active mutants against a panel of eight substrates clearly revealed the functional consequences of the substitutions at position 216. To understand better the structural basis for their altered specificity, the GA216 + MA190 and GL216 + MA190 mutants have been crystallized both with and without a representative series of peptide boronic acid transition-state analog inhibitors. An empirical description and non-parametric statistical analysis of structural variation among these enzyme: inhibitor complexes is presented. The roles of active site plasticity and dynamics in alpha-lytic protease function and substrate preference are also addressed. The results strongly suggest that substrate specificity determination in alpha-lytic protease is a distributed property of the active site and substrate molecule.
About this StructureAbout this Structure
1GBM is a Single protein structure of sequence from Lysobacter enzymogenes. This structure supersedes the now removed PDB entry 1P08. Full crystallographic information is available from OCA.
ReferenceReference
Kinetic and structural characterization of mutations of glycine 216 in alpha-lytic protease: a new target for engineering substrate specificity., Mace JE, Agard DA, J Mol Biol. 1995 Dec 8;254(4):720-36. PMID:7500345
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