Hemoglobin Savannah (B6(24) Beta-glycine is Greater Than Valine): an Unstable Variant Causing Anemia with Inclusion Bodies

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1971 Mar 1

PMID 5545125

Citations 7

Authors

T H HUISMAN

A K Brown

G D Efremov

J B Wilson

C A Reynolds

R Uy

L L Smith

Affiliations

Soon will be listed here.

Abstract

An abnormal hemoglobin, termed Hb Savannah, was found in red cell hemolysate of a young Caucasian girl with severe hemolytic anemia. The presence of this unstable variant became evident when inclusion bodies appeared rapidly upon exposure of red cells to redox dyes and a large percentage of hemoglobin in hemolysate precipitated on warming to 65 degrees C. Treatment of the hemoglobin with p-hydroxymercuribenzoate (PMB) caused a rapid dissociation into monomers; starch-gel electrophoresis of PMB-treated hemoglobin showed the presence of abnormal beta-chains. Data from structural studies of isolated beta-chains indicated substitution of a valyl residue for the normally occurring glycyl residue at position 24, which corresponds to helical residue B6. A similar substitution but with an arginine replacing the glycyl residue has been observed in Hb Riverdale-Bronx. The glycine to valine substitution will change the relationship of the B and the E helices which results in extensive conformational changes in the beta-chain. This change presumably causes an increased dissociation of the hemoglobin molecule into dimers and probably monomers, and a decreased stability of the alphabeta-dimers. The hemoglobin abnormality may be the result of a fresh mutation because the abnormality is not present in the parents nor in any of the seven siblings.

Citing Articles

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