1foz

STRUCTURE OF CYCLIC PEPTIDE INHIBITORS OF MAMMALIAN RIBONUCLEOTIDE REDUCTASE

spinqualitylabelsall models 1foz Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1foz is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Mammalian ribonucleotide reductase (mRR), a potential target for cancer intervention, is composed of two subunits, mR1 and mR2, whose association is critical for enzyme activity. In this article we describe the structural features of the mRR-inhibitor Ac-F-c[ELAK]-DF (Peptide 3) while bound to the mR1 subunit as determined by transferred NOEs. Peptide 3 is a cyclic analogue of the N-acetylated form of the heptapeptide C-terminus of the mR2 subunit (Ac-FTLDADF), which is the link between the two subunits and previously shown to be the minimal sequence inhibitor mRR by competing with mR2 for binding to mR1. Structural refinement employing an ensemble-based, full-relaxation matrix approach resulted in two structures varying in the conformations of F(1) and the cyclic lactam side chains of E(2) and K(5). The remainder of the molecule, both backbone and side chains, is extremely well-defined, with an RMSD of 0.54 A. The structural features of this conformationally constrained analogue provide unique insight into the requirements for binding to mR1, critical for further inhibitor development. Structure-based optimization of peptide inhibitors of mammalian ribonucleotide reductase.,Pellegrini M, Liehr S, Fisher AL, Laub PB, Cooperman BS, Mierke DF Biochemistry. 2000 Oct 10;39(40):12210-5. PMID:11015199 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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