8tln
From Proteopedia
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STRUCTURAL COMPARISON SUGGESTS THAT THERMOLYSIN AND RELATED NEUTRAL PROTEASES UNDERGO HINGE-BENDING MOTION DURING CATALYSIS
Overview
Crystal structures are known for three members of the bacterial neutral, protease family: thermolysin from Bacillus thermoproteolyticus (TLN), the, neutral protease from Bacillus cereus (NEU), and the elastase of, Pseudomonas aeruginosa (PAE), both in free and ligand-bound forms. Each, enzyme consists of an N-terminal and C-terminal domain with the active, site formed at the junction of the two domains. Comparison of the, different molecules reveals that the structure within each domain is well, conserved, but there are substantial hinge-bending displacements (up to 16, degrees) of one domain relative to the other. These domain motions can be, correlated with the presence or absence of bound inhibitor, as was, previously observed in the specific example of PAE [Thayer, M.M., Flaherty, K.M., & McKay, D.B. (1991) J. Biol. Chem. 266, 2864-2871]. The, binding of inhibitor appears to be associated with a reduction of the, domain hinge-bending angle by 6-14 degrees and a closure of the "jaws" of, the active site cleft by about 2 A. Crystallographic refinement of the, structure of thermolysin suggests that electron density seen in the active, site of the enzyme in the original structure determination probably, corresponds to a bound dipeptide. Thus, the crystal structure appears to, correspond to an enzyme-inhibitor or enzyme-product complex, rather than, the free enzyme, as has previously been assumed.
About this Structure
8TLN is a Single protein structure of sequence from Bacillus thermoproteolyticus with CA, ZN and DMS as ligands. This structure superseeds the now removed PDB entries 3TLN, 1TLN and 2TLN. Active as Thermolysin, with EC number 3.4.24.27 Full crystallographic information is available from OCA.
Reference
Structural comparison suggests that thermolysin and related neutral proteases undergo hinge-bending motion during catalysis., Holland DR, Tronrud DE, Pley HW, Flaherty KM, Stark W, Jansonius JN, McKay DB, Matthews BW, Biochemistry. 1992 Nov 24;31(46):11310-6. PMID:1445869
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