Primary Citation of Related Structures: 1ESA, 1ESB
PubMed Abstract:
The method of X-ray crystallographic cryoenzymology has been used to determine the crystal structure of a kinetically significant species on the reaction pathway of a crystalline enzyme. The structure of a specific acyl-enzyme intermediate in the elastase-catalyzed hydrolysis of the N-carbobenzoxy-L-alanine p-nitrophenyl ester has been determined and refined against X-ray diffraction data at 2 ...
The method of X-ray crystallographic cryoenzymology has been used to determine the crystal structure of a kinetically significant species on the reaction pathway of a crystalline enzyme. The structure of a specific acyl-enzyme intermediate in the elastase-catalyzed hydrolysis of the N-carbobenzoxy-L-alanine p-nitrophenyl ester has been determined and refined against X-ray diffraction data at 2.3-A resolution. The difference Fourier electron density map clearly shows electron density for the trapped acyl-enzyme. The acyl-enzyme was formed at -26 degrees C and was stabilized at -55 degrees C during data collection, taking advantage of the glass transition in protein dynamics that occurs at around -50 degrees C.
Related Citations:
Crystal Structure of the Covalent Complex Formed by a Peptidyl Alpha,Alpha-Difluoro-Beta-Keto Amide with Porcine Pancreatic Elastase at 1.78 Angstroms Resolution Takahashi, L.H., Radhakrishnan, R., Rosenfield Junior, R.E., Meyer Junior, E.F., Trainor, D.A. (1989) J Am Chem Soc 111: 3368
Structure of Native Procine Pancreatic Elastase at 1.65 Angstroms Resolution Meyer, E., Cole, G., Radhakrishnan, R., Epp, O. (1988) Acta Crystallogr B 44: 26
Structures of Product and Inhibitor Complexes of Streptomyces Griseus Protease a at 1.8 Angstroms Resolution James, M.N.G., Sielecki, A.R., Brayer, G.D., Delbaere, L.T.J. (1980) J Mol Biol 144: 43
Formation of Stable Crystalline Enzyme-Substrate Intermediates at Sub-Zero Temperatures Fink, A.L., Ahmed, A.I. (1976) Nature 263: 294
Crystal Structure of Elastase-Substrate Complex at-55 Degc Alber, T., Petsko, G.A., Tsernoglou, D. (1976) Nature 263: 297
Organizational Affiliation:
Department of Biochemistry, Brandeis University, Waltham, Massachusetts 02254.
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