phosphorylase, kinase?

Question

what's the difference between a phosphorylase and a kinase? or are they different names for the same class of proteins?

what? i'm pretty sure it is phosphatases that remove phosphate groups

Answer 1

If I Remember Correctly From my Biochemistry, a Phosphorylase Hydrolyzes an Ester Bond to a Phosphate Group, Whereas a Kinase Dehydrates or Adds a Phosphate Group, Simply, Removes or Adds a Phosphate. BTW, Each of These Enzymes Are Capable of Running In Reverse, Under the Appropriate Conditions.

I See Where you Are Coming From, I Remember Having the Same Problem, Two Names for The Same Thing, Perhaps they Are Subtly Different. Perhaps Colleen is Describing the Difference.


My Memory Appears to Be Faulty.


Collen is Correct, my Initial Response was Incorrect, I Looked Up Phosphorylase On the Net, and Came Across this Wikipedia (Not that they Can Always Be Trusted) Entry:


http://en.wikipedia.org/wiki/Phosphorylase

Answer 2

A phosphorylase is an enzyme that catalyzes the addition of a phosphate group from an inorganic phosphate (phosphate+hydrogen) to an acceptor.

A kinase transfers a phosphate group from a donor (usually ATP) to an acceptor.

Answer 3

they have opposite functions.. phosphorylases remove phosphate groups from proteins: kinases add them