Direct structural observation of an acyl-enzyme intermediate in the hydrolysis of an ester substrate by elastase.Ding, X., Rasmussen, B.F., Petsko, G.A., Ringe, D.
(1994) Biochemistry 33: 9285-9293
- PubMed: 8049229
- Primary Citation of Related Structures:  1ESA
- PubMed Abstract:
- 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
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- Crystal Structure of Elastase-Substrate Complex at-55 Degc
Alber, T.,Petsko, G.A.,Tsernoglou, D.
(1976) Nature 263: 297
- Formation of Stable Crystalline Enzyme-Substrate Intermediates at Sub-Zero Temperatures
Fink, A.L.,Ahmed, A.I.
(1976) Nature 263: 294
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 ela ...
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.
Department of Biochemistry, Brandeis University, Waltham, Massachusetts 02254.