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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Structure of human lactoferrin at 3.2-A resolution.

The three-dimensional structure of human milk lactoferrin, a member of the transferrin family, has been determined crystallographically at 3.2-A resolution. The molecule has two-fold internal homology. The N- and C-terminal halves form two separate globular lobes, connected by a short alpha-helix, and carry one iron-binding site each. Each lobe has the same folding, based on two domains of similar supersecondary structure, with the iron site at the domain interface. Each iron atom is coordinated by four protein ligands: two tyrosines, one histidine, and one aspartate. A probable CO3(2-) (or HCO3-) ion is suggested by the electron density, bound to iron and adjacent to an arginine side chain and a helix N terminus. The protein folding and location of the binding sites show marked similarities with those of other binding proteins, notably the sulfate-binding protein from Salmonella typhimurium.[1]

References

  1. Structure of human lactoferrin at 3.2-A resolution. Anderson, B.F., Baker, H.M., Dodson, E.J., Norris, G.E., Rumball, S.V., Waters, J.M., Baker, E.N. Proc. Natl. Acad. Sci. U.S.A. (1987) [Pubmed]
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