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Biophysical Journal 12: 625-635 (1972)
© 1972 the Biophysical Society

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Manganous Ion as a Spin Label in Studies of Mitochondrial Uptake of Manganese

T. E. Gunter and J. S. Puskin

ABSTRACT

Manganous ion (Mn2+) has been used as a spin label for studies of divalent cation uptake by rat liver mitochondria. Spin exchange, observed in the electron paramagnetic resonance (EPR) spectrum of a fraction of the transported Mn2+, shows that this fraction is bound in regions of high local concentration within the mitochondria. The average separation of manganese ions in that fraction is estimated to be 4.0 ±0.6 A at the time of greatest concentration.






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Copyright © 1972 by the Biophysical Society.