NCIt definition : A dimethylated derivative of L-arginine where the two methyl groups are attached to
arginine in a symmetrical configuration. Symmetric dimethylarginine (SDMA) is formed
when S-adenosylmethionine protein N-methyltransferases transfer one methyl group from
S-adenosylmethionine to each of the two guanidine nitrogen groups of a single arginine
residue in a protein. SDMA is released when the protein is degraded. SDMA doesn't
bind nitric oxide synthase (NOS) but may noncompetitivelty inhibit nitric oxide (NO)
synthesis by reducing L-arginine availability; it also may play a role in the modulation
of cardiovascular homeostasis and renal function.;