R6 Hexameric Insulin Complexed with m-Cresol or ResorcinolSmith, G.D., Ciszak, E., Magrum, L.A., Pangborn, W.A., Blessing, R.H.
(2000) Biochem.Biophys.Res.Commun. 56: 1541-1548
- PubMed: 11092919
- Primary Citation of Related Structures:
- PubMed Abstract:
- Phenol Stabilizes more Helix in a New Symmetrical Zinc Insulin Hexamer
Derewenda, U.,Derewenda, Z.,Dodson, E.J.,Dodson, G.G.,Reynolds, C.D.,Smith, G.D.,Sparks, C.,Swenson, D.
(1989) Nature 338: 594
- Structure of a Rhombohedral R6 Insulin/Phenol Complex
Smith, G.D.,Dodson, G.G.
(1992) Proteins 14: 401
The structures of three R(6) human insulin hexamers have been determined. Crystals of monoclinic m-cresol-insulin, monoclinic resorcinol-insulin and rhombohedral m-cresol-insulin diffracted to 1. 9, 1.9 and 1.78 A, respectively, and have been refined ...
The structures of three R(6) human insulin hexamers have been determined. Crystals of monoclinic m-cresol-insulin, monoclinic resorcinol-insulin and rhombohedral m-cresol-insulin diffracted to 1. 9, 1.9 and 1.78 A, respectively, and have been refined to residuals of 0.195, 0.179 and 0.200, respectively. In all three structures, a phenolic derivative is found to occupy the phenolic binding site, where it forms hydrogen bonds to the carbonyl O atom of CysA6 and the N atom of CysA11. Two additional phenolic derivative binding sites were identified within or between hexamers. The structures of all three hexamers are nearly identical, although a large displacement of the N-terminus of one B chain in both monoclinic structures results from coordination to a sodium ion which is located between symmetry-related hexamers. Other minor differences in structure arise from differences in packing in the monoclinic cell compared with the rhombohedral cell. Based upon the differences in conformation of the GluB13 side chains in T(6), T(3)R(f)(3) and R(6) hexamers, the deprotonation of these side chains appears to be associated with the T-->R conformational transition.
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