Structure of buffalo lactoferrin at 2.5 A resolution using crystals grown at 303 K shows different orientations of the N and C lobes.Karthikeyan, S., Paramasivam, M., Yadav, S., Srinivasan, A., Singh, T.P.
(1999) Acta Crystallogr.,Sect.D 55: 1805-1813
- PubMed: 10531476
- DOI: 10.1107/s0907444999010951
- PubMed Abstract:
- Purification, Crystallization, and X-Ray Diffraction Studies of Lactotransferrin from Buffalo Colostrum
Raman, A.,Bhatia, K.L.,Singh, T.P.,Srinivasan, A.,Betzel, C.,Malik, R.C.
(1992) Arch.Biochem.Biophys. 294: 319
- Three-Dimensional Structure of Diferric Bovine Lactoferrin at 2.8 A Resolution
Moore, S.A.,Anderson, B.F.,Groom, C.R.,Haridas, M.,Baker, E.N.
(1997) J.Mol.Biol. 274: 222
The structure of buffalo lactoferrin has been determined at 303 K. The crystals belong to orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 77.5, b = 91.0, c = 131.5 A and Z = 4. The structure has been refined to an R factor of 0. ...
The structure of buffalo lactoferrin has been determined at 303 K. The crystals belong to orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 77.5, b = 91.0, c = 131.5 A and Z = 4. The structure has been refined to an R factor of 0.187. The overall structure of the protein is similar to its structure determined at 277 K in a different crystal form. However, the lobe orientations in the two structures differ by 9.0 degrees, suggesting significant inter-lobe flexibility in this family of proteins. The inter-lobe interactions are predominantly hydrophobic and could act as a cushion for a change in orientation under the influence of external conditions. On the other hand, the domain arrangements are found to be similar in 277 and 303 K crystal structures, with orientations differing by 1.5 and 1.0 degrees in the N and C lobes, respectively. The results of these investigations suggest that the increase in temperature helps in the production of better quality crystals.
Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India.