s-adenosylmethionine , generated enzymically in chirally pure form ( s configuration at sulfur ) , undergoes simultaneous irreversible conversion to 5'-deoxy-5'- ( methylthio ) adenosine and homoserine with a rate constant of 6 x 10 ( -6 ) s-1 at ph 7.5 and 37 degrees c and reversible conversion to an enzymically inactive stereoisomer ( r configuration at sulfur ) with a forward rate constant of 8 x 10 ( -6 ) s-1 at ph 7.5 and 37 degrees c .
C0036002
s-adenosylmethionine
C0001443
adenosine