Crystal structure of destripeptide (B28-B30) insulin: implications for insulin dissociation.Ye, J., Chang, W., Liang, D.
(2001) Biochim.Biophys.Acta 1547: 18-25
- PubMed: 11343787
- PubMed Abstract:
- 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
- Crystal Structural Studies of Destripeptide (B28-B30) Insulin
Ye, J.,Mao, Y.,Gui, L.,Chang, W.,Liang, D.
(2000) SCI.CHINA,SER.B 43: 178
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 ...
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.
National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, 100101, Beijing, PR China.