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PLANT PHYSIOLOGY , Vol 115, Issue 3 1259-1266, Copyright © 1997 by American Society of Plant Biologists
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PLANT-MICROBE AND PLANT-INSECT INTERACTIONS |
Rice Hemoglobins (Gene Cloning, Analysis, and O2-Binding Kinetics of a Recombinant Protein Synthesized in Escherichia coli)
R. Arredondo-Peter, M. S. Hargrove, G. Sarath, J. F. Moran, J. Lohrman, J. S. Olson and R. V. Klucas
Department of Biochemistry, University of Nebraska, The Beadle Center, P.O. Box 880664, Lincoln, Nebraska 68588-0664 (R.A.-P., G.S., J.F.M., J.L., R.V.K.)
Although nonsymbiotic hemoglobins (Hbs) are found in different tissues of
dicots and monocots, very little is known about hb genes in monocots and
the function of Hbs in nonsymbiotic tissues. We report the cloning and
analysis of two rice (Oryza sativa L.) hb genes, hb1 and hb2, that code for
plant Hbs. Rice hb1 and hb2 genes contain four exons and three introns, as
with all of the known plant hb genes. At least three copies of the hb gene
were detected in rice DNA, and analysis of gene expression shows that hb1
and hb2 are expressed in leaves but only hb1 is expressed in roots. A cDNA
for rice Hb1 was expressed in Escherichia coli, and the recombinant Hb
(rHb1) shows an unusually high affinity for O2 because of a very low
dissociation constant. The absorbance spectra of the ferric and
deoxyferrous rHb1 indicate that, in contrast to symbiotic Hbs, a distal
ligand is coordinated to the ligand-binding site. Mutation of the distal
His demonstrates that this residue coordinates the heme Fe of ferric and
deoxyferrous rHb1 and stabilizes O2 in oxy-rHb1. The biochemical properties
of rice rHb1 suggest that this protein probably does not function to
facilitate the diffusion of O2.
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