PMID: 8049229

Authors:

Ding X, Rasmussen BF, Petsko GA, Ringe D

Title:

Direct structural observation of an acyl-enzyme intermediate in the hydrolysis of an ester substrate by elastase.

Journal:

Biochemistry. 1994 Aug 9;33(31):9285-93.

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 2.3-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.