Inactivation of a beta-glucosidase from Arthrobotrys conoides by diethyl pyrocarbonate: evidence of histidine at the active site.
Indian J Exp Biol
; 1992 Feb; 30(2): 99-102
Article
in En
| IMSEAR
| ID: sea-58961
ABSTRACT
Modification of A. conoides beta-glucosidase by diethylpyrocarbonate caused rapid inactivation of the enzyme. The kinetic analyses showed that the inactivation by diethylpyrocarbonate resulted from the modification of an average of one histidine residue per mole of enzyme. The modified enzyme showed an increase in absorbance at 240 nm. Sulphydryl, lysine and tyrosine residues were not modified by diethylpyrocarbonate treatment. The substrate offered significant protection against diethylpyrocarbonates modification. The results indicate that diethylpyrocarbonate was interacting with the enzyme at or near the active site.
Full text:
1
Index:
IMSEAR
Main subject:
Pyridoxal Phosphate
/
Binding Sites
/
Nitrophenylgalactosides
/
Beta-Glucosidase
/
Mitosporic Fungi
/
Diethyl Pyrocarbonate
/
Histidine
/
Iodoacetamide
Language:
En
Journal:
Indian J Exp Biol
Year:
1992
Type:
Article