Crystallization of type I chloramphenicol acetyltransferase: an approach based on the concept of ionic strength reducers.
Acta Crystallogr D Biol Crystallogr
; 56(Pt 1): 101-3, 2000 Jan.
Article
en En
| MEDLINE
| ID: mdl-10666642
ABSTRACT
Chloramphenicol acetyltransferase (CAT) is responsible for bacterial resistance to chloramphenicol. It catalyzes inactivation of the antibiotic by acetyl-group transfer from acetyl CoA to one or both hydroxyl groups of chloramphenicol. Type I CAT possesses some unique properties which are not observed in other CAT variants. Type I CAT overexpressed in Escherichia coli was purified and crystals with a resolution limit of 2.22 A have been obtained using a novel procedure which is based on the concept of 'ionic strength reducers'. The crystals have the symmetry of space group P1 and unit-cell parameters a = 96.46, b = 113.86, c = 114.21 A, alpha = 119.9, beta = 94.1, gamma = 98.6 degrees. These dimensions are consistent with four to six trimers per unit cell, corresponding to a solvent fraction ranging from 65 to 47%.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Cloranfenicol O-Acetiltransferasa
Idioma:
En
Revista:
Acta Crystallogr D Biol Crystallogr
Año:
2000
Tipo del documento:
Article
País de afiliación:
Bulgaria