Spectrosopic studies of an insect hemoglobin from the backswimmer Buenoa margaritacea (hemiptera:notonectidae)

Paweł A. Osmulski, Charles R. Vossbrinck, Vijaya Sampath, Winslow S. Caughey, Peter G. Debrunner

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Hemoglobin (Hb) isolated from the backswimmer Buenoa margaritacea has been analyzed spectroscopically. The met form at pH < 6 shows a 30nm red shift in the Qv and Qo bands and a 5nm red shift in the Soret band compared to mammalian Hb, while only minor differences are seen in the spectra of the CO and O2 adducts of Hb from Buenoa and mammals. EPR spectra of the metHb show a superposition of signals; at low pH they are mainly of axial high-spin character, while at high pH a low-spin signal predominates with an O-type g-tensor (2.54, 2.61, 1.85) comparable to that of hydroxy myoglobin. Infrared spectra of Hb12C-16O at pH 8.2 reveal two major absorption bands at 1934 cm-1 and 1967 cm-1, which shift to 1892 cm-1 and 1923 cm-1, respectively, for Hb12C-18O. As isolated the Buenoa Hb consists of several isozymes, all of which have a histidine as the proximal ligand of the heme iron.

Original languageEnglish (US)
Pages (from-to)570-576
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume187
Issue number2
DOIs
StatePublished - Sep 16 1992
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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