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Biophysical Journal 54: 731-736 (1988)
© 1988 the Biophysical Society

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Picosecond absorption studies on the photodissociation of alpha- and beta-nitrosyl hemoglobin monomers.

C R Guest and L J Noe

Department of Chemistry, University of Wyoming, Laramie 82071.

ABSTRACT

Transient absorption studies of the pump-probe type were performed on the NO forms of the alpha- and beta-monomers of hemoglobin using a Nd3+ phosphate-glass laser. A second harmonic 531-nm, 8-ps fwhm pulse pumped the Q-band while a delayed continuum generated pulse was used to monitor pi pi* Soret absorption changes in the 410-453-nm region. Photodissociation of nitrosyl alpha- and beta-monomers was found to differ markedly from the tetramer in what we believe to be the formation of a five-coordinate HbNO (with proximal imidazole detached) photoproduct within the first 50 ps after photon absorption.






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Copyright © 1988 by the Biophysical Society.