Nitrite reductase activity of sol-gel-encapsulated deoxyhemoglobin: Influence of quaternary and tertiary structure

Camille J. Roche, David Dantsker, Uri Samuni, Joel M. Friedman

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Nitrite reductase activity of deoxyhemoglobin (HbA) in the red blood cell has been proposed as a non-nitric-oxide synthase source of deliverable nitric oxide (NO) within the vasculature. An essential element in this scheme is the dependence of this reaction on the quaternary/tertiary structure of HbA. In the present work sol-gel encapsulation is used to trap and stabilize deoxy-HbA in either the T or R quaternary state, thus allowing for the clear-cut monitoring of nitrite reductase activity as a function of quaternary state with and without effectors. The results indicate that reaction is not only R-T-dependent but also heterotropic effector-dependent within a given quaternary state. The use of the maximum entropy method to analyze carbon monoxide (CO) recombination kinetics from fully and partially liganded sol-gel-encapsulated T-state species provides a framework for understanding effector modulation of T-state reactivity by influencing the distribution of high and low reactivity T-state conformations.

Original languageEnglish (US)
Pages (from-to)36874-36882
Number of pages9
JournalJournal of Biological Chemistry
Volume281
Issue number48
DOIs
StatePublished - Dec 1 2006

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Nitrite Reductases
Polymethyl Methacrylate
Sol-gels
Gels
Maximum entropy methods
Entropy
Carbon Monoxide
Encapsulation
Oxides
Genetic Recombination
Conformations
Nitric Oxide
Blood
Erythrocytes
Cells
Modulation
Kinetics
Monitoring
deoxyhemoglobin

ASJC Scopus subject areas

  • Biochemistry

Cite this

Nitrite reductase activity of sol-gel-encapsulated deoxyhemoglobin : Influence of quaternary and tertiary structure. / Roche, Camille J.; Dantsker, David; Samuni, Uri; Friedman, Joel M.

In: Journal of Biological Chemistry, Vol. 281, No. 48, 01.12.2006, p. 36874-36882.

Research output: Contribution to journalArticle

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