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  • Biochemistry and Biotechnology  (1)
  • conformers  (1)
  • 1
    ISSN: 1432-1017
    Keywords: Insulin ; conformers ; molecular dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Insulin crystallizes in different forms, some of which show different conformations for the different molecules in the asymmetric unit. This observation leads to the question as to which conformation the molecule will adopt in solution. Molecular dynamics computer simulations of rhombohedral 2 Zn pig insulin have been carried out for both monomers (1 and 2) independently in order to study their behaviour in the absence of quaternary structure and crystal packing forces. These preliminary 120 ps simulations suggest that both monomers converge in solution to very similar conformations which differ from the X-ray structures of both monomer 1 and 2 (Chinese nomenclature), but are closer to the former, as has previously been suggested by an analysis of the crystal packing (Chothia et al. 1983) and by energy minimization (Wodak et al. 1984). The secondary structure of the molecules is basically preserved, as expected. A detailed description of the conformational changes is given.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 27 (1997), S. 507-516 
    ISSN: 0887-3585
    Keywords: insulin ; despentapeptide ; structure ; fibrillation ; x-ray crystallography ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The crystal structure of despentapeptide insulin, a monomeric insulin, has been refined at 1.3 Å spacing and subsequently used to predict and model the organization in the insulin fibril. The model makes use of the contacts in the densely packed despentapeptide insulin crystal, and takes into account other experimental evidence, including binding studies with Congo red. The dimensions of this model fibril correspond well with those measured experimentally, and the monomer-monomer contacts within the fibril are in accordance with the known physical chemistry of insulin fibrils. Using this model, it may be possible to predict mutations in insulin that might alleviate problems associated with fibril formation during insulin therapy. © 1997 Wiley-Liss Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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