Ligand binding kinetics of hemoglobin from the earthworm

K. J. Boelts, L. J. Parkhurst

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Kinetic measurements of CO and O2 binding by the high molecular weight (ca. 3,000,000) hemoglobin from Lumbricus terrestris reveal that: (1) the high co-operativity is associated with a much lower value for 1′ ("on" constant for CO) than in mammalian hemoglobins and (2) the value of 1′ for the subunits is at least 20 times that for the intact polymer. Co-operativity in O2 binding is also manifested kinetically in the O2 dissociation reaction in the absence and presence of CO as a replacement ligand.

Original languageEnglish (US)
Pages (from-to)637-643
Number of pages7
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - May 7 1971

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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