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The D-Helix in Myoglobin and in the β Subunit of Hemoglobin Is Required for the Retention of Heme

✍ Scribed by Whitaker, Timothy L.; Berry, Michael B.; Ho, Emai L.; Hargrove, Mark S.; Phillips, George N.; Komiyama, Noboru H.; Nagai, Kiyoshi; Olson, John S.


Book ID
127020882
Publisher
American Chemical Society
Year
1997
Tongue
English
Weight
30 KB
Volume
36
Category
Article
ISSN
0006-2960

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Fluorescence polarization measurements of protoporphyrin embedded in the heme-pockets of myoglobin and hemoglobin reveal three different rotational regimes of the porphyrin which are temperature-dependent. At very low temperatures, porphyrin motions in the cavity depend upon the viscosity of the ext