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Biophysical Journal 53: 659-664 (1988)
© 1988 the Biophysical Society

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Time-resolved circular dichroism and absorption studies of the photolysis reaction of (carbonmonoxy)myoglobin.

S J Milder, S C Bjorling, I D Kuntz and D S Kliger

Department of Chemistry, University of California, Santa Cruz 95064.

ABSTRACT

Time-resolved circular dichroism (TRCD) and absorption spectroscopy are used to follow the photolysis reaction of (carbonmonoxy)myoglobin (MbCO). Following the spectral changes associated with the initial loss of CO, a subtle change is observed in the visible absorption spectrum of the Mb product on a time scale of a few hundred nanoseconds. No changes are seen in the CD spectrum of Mb in the visible and near-UV regions subsequent to the loss of CO. The data suggest the existence of an intermediate found after ligand loss from MbCO that is similar in structure to the final Mb product.






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Copyright © 1988 by the Biophysical Society.