The high resolution structure of hemalbumin was determined by single crystal X-ray diffraction to a resolution of 1.9 A. The structure revealed the protoporphyrin IX bound to a single site within a hydrophobic cavity in subdomain IB, one of the principal binding sites for long chain fatty acid ...
The high resolution structure of hemalbumin was determined by single crystal X-ray diffraction to a resolution of 1.9 A. The structure revealed the protoporphyrin IX bound to a single site within a hydrophobic cavity in subdomain IB, one of the principal binding sites for long chain fatty acid. The iron is penta coordinated with the fifth ligand comprised of the hydroxyl oxygen of Tyr-161 (phenolic oxygen to heme plane distance: 2.73 A) in an otherwise completely hydrophobic pocket. The heme propionic acid residues form salt bridges with His-142 and Lys-190, which together with a series of hydrophobic interactions, enclose and secure the heme within the IB helical motif. A detailed discussion of the structure together with its implications for the development of potential blood substitutes is presented.
Related Citations:
Atomic Structure and Chemistry of Human Serum Albumin He, X.M., Carter, D.C. (1992) Nature 358: 209
Structure of Human Serum Albumin Carter, D.C., He, X.M. (1990) Science 249: 302
Three-Dimensional Structure of Human Serum Albumin Carter, D.C., He, X.M., Munson, S.H., Twigg, P.D., Gernert, K.M., Broom, M.B., Miller, T.Y. (1989) Science 244: 1195
Preliminary Crystallographic Studies of Four Crystal Forms of Serum Albumin Carter, D.C., Chang, B., Ho, J.X., Keeling, K., Krishnasami, Z. (1994) Eur J Biochem 226: 1049
Organizational Affiliation:
New Century Pharmaceuticals, Inc., 895 Martin Road, Huntsville, Alabama 35824, USA.
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