1thl
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Thermolysin complexed with a novel glutaramide derivative, n-(1-(2(r,s)-carboxy-4-phenylbutyl) cyclopentylcarbonyl)-(s)-tryptophan
OverviewOverview
Determination of the X-ray structure of thermolysin-inhibitor complexes, has proven useful in aiding our understanding of the mode of binding of, inhibitors of related, physiologically important, mammalian zinc, peptidases including neutral endopeptidase EC 3.4.24.11 and, angiotensin-converting enzyme. Here we describe the mode of binding to, crystalline thermolysin of, N-[1-(2(R,S)-carboxy-4-phenylbutyl)-cyclopentylcarbonyl]-(S) -tryptophan, (CCT). CCT is an analogue of both candoxatrilat, a potent inhibitor of, neutral endopeptidase 24.11, and of the 5-indanyl ester prodrug, candoxatril, which is under clinical evaluation as a potential therapy for, congestive heart failure. CCT differs from the previously studied, N-carboxyalkyl dipeptide CLT, [N-(S)-(1-carboxy-3-phenylpropyl)-(S)-leucyl-(S)-tryptophan] in several, important respects. It has a highly constrained gem-cyclopentyl P1', substituent and lacks the characteristic imino nitrogen substituent of, CLT. The structure determination shows that, notwithstanding the, conformational influence of the gem-cyclopentyl substituent, CCT binds, within the active site of thermolysin in a similar manner to CLT. Although, the characteristic hydrogen bond between the imino nitrogen of CLT and, thermolysin is absent in CCT, the affinities of the two inhibitors for the, enzyme are virtually identical. These results illustrate the importance of, considering not only those hydrogen bonds that are formed in an, enzyme-ligand complex but also the other hydrogen bonds that may be lost, due to desolvation of the enzyme and ligand on formation of the complex., In addition, the overall conformational demands placed upon a ligand in, order to achieve receptor interaction may be critically important.
About this StructureAbout this Structure
1THL is a Single protein structure of sequence from Bacillus thermoproteolyticus with CA, ZN, TRP, CLT and CCM as ligands. Active as Thermolysin, with EC number 3.4.24.27 Full crystallographic information is available from OCA.
ReferenceReference
Inhibition of thermolysin and neutral endopeptidase 24.11 by a novel glutaramide derivative: X-ray structure determination of the thermolysin-inhibitor complex., Holland DR, Barclay PL, Danilewicz JC, Matthews BW, James K, Biochemistry. 1994 Jan 11;33(1):51-6. PMID:8286362
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