Destripeptide (B28-B30) insulin (DTRI) is an insulin analogue that has much weaker association ability than native insulin but keeps most of its biological activity. It can be crystallized from a solution containing zinc ions at near-neutral pH. Its crystal structure has been determined by molecular replacement and refined at 1 ...
Destripeptide (B28-B30) insulin (DTRI) is an insulin analogue that has much weaker association ability than native insulin but keeps most of its biological activity. It can be crystallized from a solution containing zinc ions at near-neutral pH. Its crystal structure has been determined by molecular replacement and refined at 1.9 A resolution. DTRI in the crystal exists as a loose hexamer compared with 2Zn insulin. The hexamer only contains one zinc ion that coordinates to the B10 His residues of three monomers. Although residues B28-B30 are located in the monomer-monomer interface within a dimer, the removal of them can simultaneously weaken both the interactions between monomers within the dimer and the interactions between dimers. Because the B-chain C-terminus of insulin is very flexible, we take the DTRI hexamer as a transition state in the native insulin dissociation process and suggest a possible dissociation process of the insulin hexamer based on the DTRI structure.
Related Citations:
Crystal Structural Studies of Destripeptide (B28-B30) Insulin Ye, J., Mao, Y., Gui, L., Chang, W., Liang, D. (2000) Sci China B 43: 178
Preparation of Destripeptide (B28-B30) Insulin and Destetrapeptide (B27-B30) Insulin and Preliminary X-ray Crystallographic Study of Destripeptide Insulin Mao, Y., Li, M., Wan, Z., Jiang, T., An, X., Liang, D., Liu, F., Huang, C., Chen, L., Hu, M. (1999) Prog Nat Sci 9: 241
Organizational Affiliation:
National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, 100101, Beijing, PR China.
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