A cooperative oxygen binding hemoglobin from Mycobacterium tuberculosis. Stabilization of heme ligands by a distal tyrosine residue

Syun-Ru Yeh, Manon Couture, Yannick Ouellet, Michel Guertin, Denis L. Rousseau

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

The homodimeric hemoglobin (HbN) from Mycobacterium tuberculosis displays an extremely high oxygen binding affinity and cooperativity. Sequence alignment with other hemoglobins suggests that the proximal F8 ligand is histidine, the distal E7 residue is leucine, and the B10 position is occupied by tyrosine. To determine how these heme pocket residues regulate the ligand binding affinities and physiological functions of HbN, we have measured the resonance Raman spectra of the O2, CO, and OH- derivatives of the wild type protein and the B10 Tyr→ Leu and Phe mutants. Taken together these data demonstrate a unique distal environment in which the heme bound ligands strongly interact with the B10 tyrosine residue. The implications of these data on the physiological functions of HbN and another heme-containing protein, cytochrome c oxidase, are considered.

Original languageEnglish (US)
Pages (from-to)1679-1684
Number of pages6
JournalJournal of Biological Chemistry
Volume275
Issue number3
DOIs
StatePublished - Jan 21 2000

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Heme
Mycobacterium tuberculosis
Tyrosine
Hemoglobins
Stabilization
Oxygen
Ligands
Sequence Alignment
Electron Transport Complex IV
Carbon Monoxide
Histidine
Leucine
Raman scattering
Proteins
Derivatives

ASJC Scopus subject areas

  • Biochemistry

Cite this

A cooperative oxygen binding hemoglobin from Mycobacterium tuberculosis. Stabilization of heme ligands by a distal tyrosine residue. / Yeh, Syun-Ru; Couture, Manon; Ouellet, Yannick; Guertin, Michel; Rousseau, Denis L.

In: Journal of Biological Chemistry, Vol. 275, No. 3, 21.01.2000, p. 1679-1684.

Research output: Contribution to journalArticle

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