Title : Investigating substrate promiscuity in cyclooxygenase-2: the role of Arg-120 and residues lining the hydrophobic groove.

Pub. Date : 2012 Jul 13

PMID : 22637474






3 Functional Relationships(s)
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1 Mutational analyses have established that an interaction of the carboxylate of AA with Arg-120 is required for high affinity binding by COX-1 but not COX-2, suggesting that hydrophobic interactions between the omega-end of substrates and cyclooxygenase channel residues play a significant role in COX-2-mediated oxygenation. Arginine cytochrome c oxidase II, mitochondrial Mus musculus
2 We used structure-function analyses to investigate the role that Arg-120 and residues lining the hydrophobic groove play in the binding and oxygenation of substrates by murine (mu) COX-2. Arginine cytochrome c oxidase II, mitochondrial Mus musculus
3 Overall, these findings implicate Arg-120 and hydrophobic groove residues as determinants that govern proper alignment of the bisallylic carbon below Tyr-385 for catalysis in COX-2 and confirm nuances between COX isoforms that explain substrate promiscuity. Arginine cytochrome c oxidase II, mitochondrial Mus musculus