An eye lens protein-water structure: 1.2 A resolution structure of gammaB-crystallin at 150 K.Kumaraswamy, V.S., Lindley, P.F., Slingsby, C., Glover, I.D.
(1996) Acta Crystallogr.,Sect.D 52: 611-622
- PubMed: 15299624
- DOI: 10.1107/S0907444995014302
- PubMed Abstract:
- Structure of Gammab-Crystallin at 150K
Lindley, P.F.,Najmudin, S.,Bateman, O.,Slingsby, C.,Myles, D.D.,Kumaraswamy, S.,Glover, I.
(1993) J.Chem.Soc.,Faraday Trans. 89: 2677
- Structure of the Bovine Eye Lens Protein Gamma B (Gamma II) Crystallin at 1.47 Angstroms
Najmudin, S.,Nalini, V.,Driessen, H.P.C.,Slingsby, C.,Blundell, T.L.,Moss, D.S.,Lindley, P.F.
(1993) Acta Crystallogr.,Sect.D 49: 223
gammabeta-crystallin is a structural protein of the eye lens with a role in the maintenance of an even distribution of protein and water over distances around the wavelength of light, preserving lens transparency. The structure of the 174-residue bov ...
gammabeta-crystallin is a structural protein of the eye lens with a role in the maintenance of an even distribution of protein and water over distances around the wavelength of light, preserving lens transparency. The structure of the 174-residue bovine protein has already been determined at room temperature to 1.47 A resolution. By flash freezing the protein crystals, data have now been collected to a nominal resolution limit of 1.2 A as radiation damage was essentially eliminated. The protein-water model has been refined against this data using the program RESTRAIN converging to an R factor of 18.5% with all data. Atomic positions are clearly indicated in the electron-density maps. Discrete bimodal disorder has been visualized for a few side chains. Out of a total of 498 water molecules present in the crystal asymmetric unit, 394 have been modelled and refined at unit occupancy. The solvent structure is extremely well ordered with an average B value of 23.4 A(2). Partially occupied sites have been identified where disorder in the protein induces concomitant disorder in the local solvent structure. The solvent structure covers 97% of the solvent-exposed surface of the protein in the crystal. 126 water molecules are distributed in second and higher hydration shells. There are networks of hydrogen-bonded solvent extending up to 64 molecules in a network, comprising trimers and tetramers as well as five- and six-membered water-ring structures. The hydration of the protein surface is dominated by arginine and aspartate side chains. Extensive cages of highly ordered solvent molecules are also observed around exposed non-polar groups.
Physics Department, Keele University, Staffordshire, England.