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4k5d

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Structure of neuronal nitric oxide synthase heme domain in complex with (S)-1,2-bis((2-amino-4-methylpyridin-6-yl)-methoxy)-propan-3-amine

Structural highlights

4k5d is a 2 chain structure with sequence from Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.096Å
Ligands:	, , , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NOS1_RAT Produces nitric oxide (NO) which is a messenger molecule with diverse functions throughout the body. In the brain and peripheral nervous system, NO displays many properties of a neurotransmitter. Inhibitory transmitter for non-adrenergic and non-cholinergic nerves in the colorectum. Probably has nitrosylase activity and mediates cysteine S-nitrosylation of cytoplasmic target proteins such SRR. Inhibitory transmitter for non-adrenergic and non-cholinergic nerves in the colorectum.

Publication Abstract from PubMed

To develop potent and selective nNOS inhibitors, new double-headed molecules with chiral linkers that derive from natural amino acids or their derivatives have been designed. The new structures contain two ether bonds, which greatly simplifies the synthesis and accelerates structure optimization. Inhibitor (R)-6b exhibits a potency of 32nM against nNOS and is 475 and 244 more selective for nNOS over eNOS and iNOS, respectively. Crystal structures show that the additional binding between the aminomethyl moiety of 6b and the two heme propionates in nNOS, but not eNOS, is the structural basis for its high selectivity. This work demonstrates the importance of stereochemistry in this class of molecules, which significantly influences the potency and selectivity of the inhibitors. The structure-activity information gathered here provides a guide for future structure optimization.

Chiral linkers to improve selectivity of double-headed neuronal nitric oxide synthase inhibitors.,Jing Q, Li H, Chreifi G, Roman LJ, Martasek P, Poulos TL, Silverman RB Bioorg Med Chem Lett. 2013 Oct 15;23(20):5674-9. doi: 10.1016/j.bmcl.2013.08.034., Epub 2013 Aug 14. PMID:23993333^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Jing Q, Li H, Chreifi G, Roman LJ, Martasek P, Poulos TL, Silverman RB. Chiral linkers to improve selectivity of double-headed neuronal nitric oxide synthase inhibitors. Bioorg Med Chem Lett. 2013 Oct 15;23(20):5674-9. doi: 10.1016/j.bmcl.2013.08.034., Epub 2013 Aug 14. PMID:23993333 doi:10.1016/j.bmcl.2013.08.034