3I40 | pdb_00003i40

X-ray investigation of gene-engineered human insulin crystallized from a solution containing polysialic acid.

(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun&nbsp66: 259-263

• PubMed:&nbsp20208155&nbspSearch on PubMedSearch on PubMed Central
• DOI:&nbsphttps://doi.org/10.1107/S1744309110000461
• Primary Citation of Related Structures: &nbsp
  3I3Z, 3I40


• PubMed Abstract:&nbsp
  

  Attempts to crystallize the noncovalent complex of recombinant human insulin with polysialic acid were carried out under normal and microgravity conditions. Both crystal types belonged to the same space group, I2(1)3, with unit-cell parameters a = b = c = 77.365 A, alpha = beta = gamma = 90.00 degrees. The reported space group and unit-cell parameters are almost identical to those of cubic insulin reported in the PDB. The results of X-ray studies confirmed that the crystals obtained were cubic insulin crystals and that they contained no polysialic acid or its fragments. Electron-density maps were calculated using X-ray diffraction sets from earth-grown and microgravity-grown crystals and the three-dimensional structure of the insulin molecule was determined and refined. The conformation and secondary-structural elements of the insulin molecule in different crystal forms were compared.

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Organizational Affiliation:&nbsp

Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, 119333 Moscow, Russia. [email protected]