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Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins.

Publication ,  Journal Article
Bonaventura, C; Henkens, R; Alayash, AI; Crumbliss, AL
Published in: IUBMB life
August 2007

A review of the oxidative and nitrosative reactions of cell-free hemoglobin-based oxygen carriers (HBOCs) shows that these reactions are intimately linked and are subject to allosteric control. Cross-linking reactions used to produce HBOCs introduce conformational constraints and result in Hbs with reduced responses to heterotropic and homotropic allosteric effectors. The Nernst plots of heme oxidation of cross-linked HBOCs are shifted to higher potentials relative to unmodified Hb in the absence of allosteric effectors, in accord with their T-state stabilization and right-shifted Hill plots of O(2) binding. They exhibit enhanced rates of autoxidation and nitrite-induced oxidation, features that appear due to their having more solvent-accessible heme pockets. The stability of their NO-Hb derivatives varies as a result of allosteric effects on the extent of formation of pentacoordinate NO-heme geometry by alpha chains and subsequent oxidation of partner beta chains. The physiological implications of these findings on the safety, efficacy and design of second generation HBOCs are discussed in the framework of a reaction scheme showing linkages between Hb-mediated redox reactions. These redox reactions can drive formation of SNO-Hb and other reactive species and are of significance for the use of cell-free Hbs in vivo.

Duke Scholars

Published In

IUBMB life

DOI

EISSN

1521-6551

ISSN

1521-6543

Publication Date

August 2007

Volume

59

Issue

8-9

Start / End Page

498 / 505

Related Subject Headings

  • Oxidative Stress
  • Nitrosation
  • Humans
  • Hemoglobins
  • Cell-Free System
  • Biochemistry & Molecular Biology
  • Allosteric Regulation
  • 3105 Genetics
  • 3101 Biochemistry and cell biology
  • 1101 Medical Biochemistry and Metabolomics
 

Citation

APA
Chicago
ICMJE
MLA
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Bonaventura, C., Henkens, R., Alayash, A. I., & Crumbliss, A. L. (2007). Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins. IUBMB Life, 59(8–9), 498–505. https://doi.org/10.1080/15216540601188546
Bonaventura, Celia, Robert Henkens, Abdu I. Alayash, and Alvin L. Crumbliss. “Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins.IUBMB Life 59, no. 8–9 (August 2007): 498–505. https://doi.org/10.1080/15216540601188546.
Bonaventura C, Henkens R, Alayash AI, Crumbliss AL. Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins. IUBMB life. 2007 Aug;59(8–9):498–505.
Bonaventura, Celia, et al. “Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins.IUBMB Life, vol. 59, no. 8–9, Aug. 2007, pp. 498–505. Epmc, doi:10.1080/15216540601188546.
Bonaventura C, Henkens R, Alayash AI, Crumbliss AL. Allosteric effects on oxidative and nitrosative reactions of cell-free hemoglobins. IUBMB life. 2007 Aug;59(8–9):498–505.
Journal cover image

Published In

IUBMB life

DOI

EISSN

1521-6551

ISSN

1521-6543

Publication Date

August 2007

Volume

59

Issue

8-9

Start / End Page

498 / 505

Related Subject Headings

  • Oxidative Stress
  • Nitrosation
  • Humans
  • Hemoglobins
  • Cell-Free System
  • Biochemistry & Molecular Biology
  • Allosteric Regulation
  • 3105 Genetics
  • 3101 Biochemistry and cell biology
  • 1101 Medical Biochemistry and Metabolomics