1rs8 | pdb_00001rs8
Bovine endothelial NOS heme domain with D-lysine-D-nitroarginine amide bound
Structural highlights
Function[NOS3_BOVIN] Produces nitric oxide (NO) which is implicated in vascular smooth muscle relaxation through a cGMP-mediated signal transduction pathway. NO mediates vascular endothelial growth factor (VEGF)-induced angiogenesis in coronary vessels and promotes blood clotting through the activation of platelets. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedIn a continuing effort to unravel the structural basis for isoform-selective inhibition of nitric oxide synthase (NOS) by various inhibitors, we have determined the crystal structures of the nNOS and eNOS heme domain bound with two D-nitroarginine-containing dipeptide inhibitors, D-Lys-D-Arg(NO)2-NH(2) and D-Phe-D-Arg(NO)2-NH(2). These two dipeptide inhibitors exhibit similar binding modes in the two constitutive NOS isozymes, which is consistent with the similar binding affinities for the two isoforms as determined by K(i) measurements. The D-nitroarginine-containing dipeptide inhibitors are not distinguished by the amino acid difference between nNOS and eNOS (Asp 597 and Asn 368, respectively) which is key in controlling isoform selection for nNOS over eNOS observed for the L-nitroarginine-containing dipeptide inhibitors reported previously [Flinspach, M., et al. (2004) Nat. Struct. Mol. Biol. 11, 54-59]. The lack of a free alpha-amino group on the D-nitroarginine moiety makes the dipeptide inhibitor steer away from the amino acid binding pocket near the active site. This allows the inhibitor to extend into the solvent-accessible channel farther away from the active site, which enables the inhibitors to explore new isoform-specific enzyme-inhibitor interactions. This might be the structural basis for why these D-nitroarginine-containing inhibitors are selective for nNOS (or eNOS) over iNOS. Structures of the neuronal and endothelial nitric oxide synthase heme domain with D-nitroarginine-containing dipeptide inhibitors bound.,Flinspach M, Li H, Jamal J, Yang W, Huang H, Silverman RB, Poulos TL Biochemistry. 2004 May 11;43(18):5181-7. PMID:15122883[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
| ||||||||||||||||||||||||
