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J. Biol. Chem., Vol. 277, Issue 22, 19538-19545, May 31, 2002
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From the Department of Biochemistry, Biophysics, and Molecular
Biology, Iowa State University, Ames, Iowa 50011
We have identified a new human hemoglobin that we
call histoglobin because it is expressed in a wide array of tissues.
Histoglobin shares less than 30% identity with the other human
hemoglobins, and the gene contains an intron in an unprecedented
location. Spectroscopic and kinetic experiments with recombinant human
histoglobin indicate that it is a hexacoordinate hemoglobin with
significantly different ligand binding characteristics than the other
human hexacoordinate hemoglobin, neuroglobin. In contrast to the very high oxygen affinities displayed by most hexacoordinate hemoglobins, the biophysical characteristics of histoglobin indicate that it could
facilitate oxygen transport. The discovery of histoglobin demonstrates
that humans, like plants, differentially express multiple
hexacoordinate hemoglobins.
To whom correspondence should be addressed: Dept. of Biochemistry,
Biophysics, and Molecular Biology, 4114 Molecular Biology Bldg., Iowa
State University, Ames, IA 50011. Tel.: 515-294-2616; Fax:
515-294-0453; E-mail: msh@iastate.edu.
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