2tmn

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{{STRUCTURE_2tmn| PDB=2tmn | SCENE= }}
{{STRUCTURE_2tmn| PDB=2tmn | SCENE= }}
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'''CRYSTALLOGRAPHIC STRUCTURAL ANALYSIS OF PHOSPHORAMIDATES AS INHIBITORS AND TRANSITION-STATE ANALOGS OF THERMOLYSIN'''
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===CRYSTALLOGRAPHIC STRUCTURAL ANALYSIS OF PHOSPHORAMIDATES AS INHIBITORS AND TRANSITION-STATE ANALOGS OF THERMOLYSIN===
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==Overview==
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The mode of binding to thermolysin of the unsubstituted phosphoramidate inhibitor N-phosphoryl-L-leucinamide (P-Leu-NH2) has been determined crystallographically and refined at high resolution (R = 17.9% to 0.16-nm resolution). The mode of binding of the naturally occurring thermolysin inhibitor phosphoramidon reported previously [Weaver, L. H., Kester, W. R. and Matthews, B. W. (1977) J. Mol. Biol. 114, 119-132] has also been confirmed by crystallographic refinement (R = 17.4% to 0.23-nm resolution). Phosphoramidon binds to the enzyme with a single oxygen of the phosphoramidate moiety as a zinc ligand. Together with three ligands to the metal from the protein the resultant complex has approximately tetrahedral geometry. However, in the case of P-Leu-NH2, two of the phosphoramidate oxygens interact with the zinc to form a complex that tends towards pentacoordinate. In this respect, P-Leu-NH2 appears to be a better transition-state analog than is phosphoramidon. In addition, the phosphorus-nitrogen bond length in P-Leu-NH2 is 0.18 nm, suggesting that the nitrogen is protonated whereas the same bond in phosphoramidon is much shorter (0.15 nm) suggesting that the nitrogen does not carry a charge. In phosphoramidon the distance from the phosphoramide nitrogen to Glu-143 is 0.39 nm whereas in P-Leu-NH2 this distance decreases to 0.34 nm. Taken together, these observations provide additional evidence in support of the participation of pentacoordinate intermediates in the mechanism of action of thermolysin [Holmes, M. A. and Matthews, B. W. (1981) Biochemistry 20, 6912-6920] and the role of Glu-143 in first promoting the attack of a water molecule on the carbonyl carbon of the scissile bond and subsequently acting as a 'proton shuttle' to transfer the proton to the leaving nitrogen [Monzingo, A. F. and Matthews, B. W. (1984) Biochemistry 23, 5724-5729; Hangauer, D. G., Monzingo, A. F. and Matthews, B. W. (1984) Biochemistry 23, 5730-5741].
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{{ABSTRACT_PUBMED_3709536}}
==About this Structure==
==About this Structure==
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[[Category: Monzingo, A F.]]
[[Category: Monzingo, A F.]]
[[Category: Tronrud, D E.]]
[[Category: Tronrud, D E.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 17:24:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 15:03:13 2008''

Revision as of 12:03, 27 July 2008

Image:2tmn.png

Template:STRUCTURE 2tmn

CRYSTALLOGRAPHIC STRUCTURAL ANALYSIS OF PHOSPHORAMIDATES AS INHIBITORS AND TRANSITION-STATE ANALOGS OF THERMOLYSIN

Template:ABSTRACT PUBMED 3709536

About this Structure

2TMN is a Single protein structure of sequence from Bacillus thermoproteolyticus. Full crystallographic information is available from OCA.

Reference

Crystallographic structural analysis of phosphoramidates as inhibitors and transition-state analogs of thermolysin., Tronrud DE, Monzingo AF, Matthews BW, Eur J Biochem. 1986 Jun 2;157(2):261-8. PMID:3709536

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