GSBS Student Publications

Title

Crystal structure of deoxy-human hemoglobin beta6 Glu --> Trp. Implications for the structure and formation of the sickle cell fiber

Publication Date

1998-11-26

UMMS Affiliation

Department of Biochemistry and Molecular Pharmacology; Program in Molecular Medicine

Document Type

Article

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

An atomic-level understanding of the interactions between hemoglobin molecules that contribute to the formation of pathological fibers in sickle cell disease remains elusive. By exploring crystal structures of mutant hemoglobins with altered polymerization properties, insight can be gained into sickle cell hemoglobin (HbS) polymerization. We present here the 2.0-A resolution deoxy crystal structure of human hemoglobin mutated to tryptophan at the beta6 position, the site of the glutamate --> valine mutation in HbS. Unlike leucine and isoleucine, which promote polymerization relative to HbS, tryptophan inhibits polymerization. Our results provide explanations for the altered polymerization properties and reveal a fundamentally different double strand that may provide a model for interactions within a fiber and/or interactions leading to heterogeneous nucleation.

Source

J Biol Chem. 1998 Dec 4;273(49):32690-6.

Journal/Book/Conference Title

The Journal of biological chemistry

Related Resources

Link to article in PubMed

PubMed ID

9830011

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