Download MendeleyStructure of recombinant human lactoferrin expressed in Aspergillus awamori.
Sun, X.L., Baker, H.M., Shewry, S.C., Jameson, G.B., Baker, E.N.(1999) Acta Crystallogr D Biol Crystallogr 55: 403-407
- PubMed: 10089347
- DOI: https://doi.org/10.1107/s0907444998011226
- Primary Citation of Related Structures:
1B0L - PubMed Abstract:
Human lactoferrin (hLf) has considerable potential as a therapeutic agent. Overexpression of hLf in the fungus Aspergillus awamori has resulted in the availability of very large quantities of this protein. Here, the three-dimensional structure of the recombinant hLf has been determined by X-ray crystallography at a resolution of 2.2 A. The final model, comprising 5339 protein atoms (residues 1-691, 294 solvent molecules, two Fe3+and two CO32- ions), gives an R factor of 0.181 (free R = 0.274) after refinement against 32231 reflections in the resolution range 10-2.2 A. Superposition of the recombinant hLf structure onto the native milk hLf structure shows a very high level of correspondence; the main-chain atoms for the entire polypeptide can be superimposed with an r.m.s. deviation of only 0.3 A and there are no significant differences in side-chain conformations or in the iron-binding sites. Dynamic properties, as measured by B-value distributions or iron-release kinetics, also agree closely. This shows that the structure of the protein is not affected by the mode of expression, the use of strain-improvement procedures or the changes in glycosylation due to the fungal system.
Organizational Affiliation:
Departments of Biochemistry and Chemistry, Massey University, Palmerston North, New Zealand.
