Need GTPase for positive control

Cornelius Krasel krasel at
Tue Aug 22 03:14:33 EST 1995

Dima Klenchin (klenchin at wrote:
> >In article <newitt-1008951734290001 at>, 
> newitt at says...
> >>I am doing some GTPase assays and would like to obtain an 
> enzyme with
> >>intrinsic GTPase activity to use as a positive control.

> John, retinal transducin, I think, would be the best thing.
> If you need it as a control, there is no need to purify the 
> protein. Bovine rods contain which are very easy to 
> purify contain HUGE amounts of it. 

AFAIK transducin is different from other G proteins in that it has
no GTPase activity when unstimulated. So you have to illuminate
the rods to get transducin activity (BTW a nice control).


/* Cornelius Krasel, U Wuerzburg, Dept. of Pharmacology, Versbacher Str. 9 */
/* D-97078 Wuerzburg, Germany        email: phak004 at */
/* "Science is the game we play with God to find out what His rules are."  */

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