Myoglobin and hemoglobin rotational diffusion in the cell

Dong Wang, Ulrike Kreutzer, Youngran Chung, Thomas Jue

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The detection of the 1H NMR signal of myoglobin (Mb) in tissue opens an opportunity to examine its cellular diffusion property, which is central to its purported role in facilitating oxygen transport. In perfused myocardium the field-dependent transverse relaxation analysis of the deoxy Mb proximal histidyl N(δ)H indicates that the Mb rotational correlation time in the cell is only ~1.4 times longer than it is in solution. Such a mobility is consistent with the theory that Mb facilitates oxygen diffusion from the sarcoplasm myocyte environment are different. The hemoglobin (Hb) rotational correlation time is 2.2 longer in the cell than in solution. Because both the overlapping Hb and Mb signals are visible in vivo, a relaxation-based NMR strategy has been developed to discriminate between them.

Original languageEnglish (US)
Pages (from-to)2764-2770
Number of pages7
JournalBiophysical Journal
Volume73
Issue number5
StatePublished - 1997

ASJC Scopus subject areas

  • Biophysics

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