Download Mendeley1.2 A refinement of the Kunitz-type domain from the alpha3 chain of human type VI collagen.
Merigeau, K., Arnoux, B., Perahia, D., Norris, K., Norris, F., Ducruix, A.(1998) Acta Crystallogr D Biol Crystallogr 54: 306-312
- PubMed: 9761897
- DOI: https://doi.org/10.1107/s0907444997010846
- Primary Citation of Related Structures:
2KNT - PubMed Abstract:
The recombinant Kunitz-type domain (C5) of human collagen alpha3(VI) chain was previously described at 1.6 A resolution at room temperature. By changing the crystallization conditions and using synchrotron radiation, we are able to record diffraction data to 1.2 A resolution for crystals of the same space group at 291 K. The protein-water-ion model has been refined anisotropically against these new data using the program SHELXL93; the results converged to an R factor of 15.0%, with all data between 7 and 1.2 A. The final electron-density map reveals a clear chain tracing with a few disordered residues and five residues out of 58 that present alternate conformations. The Cys14-Cys38 bond presents the less frequently observed left-hand conformation (chi1 = -60 degrees). The solvent molecules and a phosphate ion are well ordered with an average B of 38 A2. The high-resolution structure reveals the N and C termini which were missing from the 1.6 A structure.
Organizational Affiliation:
Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, 91198 Gif sur Yvette CEDEX, France.
