1lcm | pdb_00001lcm

NMR minimized average structure of microcystin-LR

spinqualitylabelsall models 1lcm, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1lcm is a 1 chain structure with sequence from Iam m-247. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: 1ZN, ACB, DAL, DAM, FGA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed NMR spectroscopy in aqueous and dimethyl sulfoxide/water solutions is used to determine the three-dimensional structures of microcystin-LR, a cyclic cyanobacterial heptapeptide toxin which is a potent inhibitor of type 1 and type 2A protein phosphatases. The conformations of this toxic peptide are studied using a simulated annealing (SA) protocol followed by refined SA calculations in vacuo and free MD simulations in water. Only one conformational family in each solvent is found. The peptide ring has a saddle-shaped form, essentially the same in both solvents. The structural difference observed between the two solution structures is located to the part consisting of Mdha, Ala, and Leu. This peptide segment is not present in nodularin, a cyclic pentapeptide of similar toxicity. The Arg side chain is very flexible, while the side chain of Leu is well defined. The side chain of Adda, essential for toxicity, is constrained in the vicinity of the backbone ring but appears to be flexible in the more remote part. Conformational studies of microcystin-LR using NMR spectroscopy and molecular dynamics calculations.,Trogen GB, Annila A, Eriksson J, Kontteli M, Meriluoto J, Sethson I, Zdunek J, Edlund U Biochemistry. 1996 Mar 12;35(10):3197-205. PMID:8605154 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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