Abstract:
:The triplet state absorption and phosphorescence of Zn and Pd derivatives of myoglobin were compared. Both metal derivatives exhibit long triplet state lifetimes at room temperature, but whereas the Pd derivative showed exponential decay and an isosbestic point in the transient absorption spectra, the decay of the Zn derivative was nonsingle exponential and the transient absorption spectra showed evidence of more than one excited state species. No difference was seen in triplet quenching by oxygen for either derivative, indicating that differences in the polypeptide chain between the two derivatives are not large enough to affect oxygen penetrability. Quenching was also observed by anthraquinone sulfonate. In this case, the possibility of long-range transfer by an exchange mechanism is considered.
journal_name
Biophys Jjournal_title
Biophysical journalauthors
Papp S,Vanderkooi JM,Owen CS,Holtom GR,Phillips CMdoi
10.1016/S0006-3495(90)82363-8subject
Has Abstractpub_date
1990-07-01 00:00:00pages
177-86issue
1eissn
0006-3495issn
1542-0086pii
S0006-3495(90)82363-8journal_volume
58pub_type
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