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Biophysical Journal 38: 15-18 (1982)
© 1982 the Biophysical Society

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Kinetics and temperature dependence of carboxymyoglobin ligand photodissociation.

A H Reynolds and P M Rentzepis

ABSTRACT

We have observed the rate of oxymyoglobin (MbO2) photodissociation at room temperature and carboxymyoglobin (MbCO) photodissociation as a function of temperature (260-10 K) by means of picosecond spectroscopy. The Mb + O2 and Mb + CO photodissociated states have also been characterized. Based on the picosecond experimental data, we postulate that the photodissociation of ligated myoglobin is a nonactivitated process, and the mechanism involves either a small enthalpy barrier or none at all.




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Copyright © 1982 by the Biophysical Society.