The crystal structure of an orthorhombic form of human apolactoferrin (ApoLf) has been determined from 2.8 A diffractometer data by molecular replacement methods. A variety of search models derived from the diferric lactoferrin structure (Fe2Lf) were used to obtain a consistent solution to the rotation function ...
The crystal structure of an orthorhombic form of human apolactoferrin (ApoLf) has been determined from 2.8 A diffractometer data by molecular replacement methods. A variety of search models derived from the diferric lactoferrin structure (Fe2Lf) were used to obtain a consistent solution to the rotation function. An R-factor search gave the correct translational solution and the model was refined by rigid-body least-squares refinement (program CORELS). Only three of the four domains were located correctly by this procedure, however; the fourth was finally placed correctly by rotating it manually onto three strands of electron density which were recognized as part of its central beta-sheet. The final model, refined by restrained least-squares methods to an R factor of 0.214 for data in the resolution range 10.0 to 2.8 A, shows a large domain movement in the N-terminal half of the molecule (a 54 degree rotation of domain N2) and smaller domain movements elsewhere, when compared with Fe2Lf. A feature of the crystal structure is that although the ApoLf and Fe2Lf unit cells appear very similar, their crystal packing and molecular structures are quite different.
Structure of Human Lactoferrin: Crystallographic Structure Analysis and Refinement at 2.8 Angstroms Resolution Anderson, B.F., Baker, H.M., Norris, G.E., Rice, D.W., Baker, E.N. (1989) J Mol Biol 209: 711
Transferrins: Insights Into Structure and Function from Studies on Lactoferrin Baker, E.N., Rumball, S.V., Anderson, B.F. (1987) Trends Biochem Sci (pers Ed ) 12: 350
Structure of Human Lactoferrin at 3.2 Angstroms Resolution Anderson, B.F., Baker, H.M., Dodson, E.J., Norris, G.E., Rumball, S.V., Waters, J.M., Baker, E.N. (1987) Proc Natl Acad Sci U S A 84: 1769
Organizational Affiliation:
Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand.
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