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ELECTRON MICROSCOPIC LOCALIZATION OF MITOCHONDRIAL ADENOSINE TRIPHOSPHATASE ACTIVITY

I. WILLIAM GROSSMAN 1 and DALE H. HEITKAMP 1

1 Biomedical Department, Biophysics Laboratory, Research Laboratories, Edgewood Arsenal, Edgewood Arsenal, Maryland

Magnesium-dependent adenosine triphosphatase (ATPase) activity of unfixed, isolated, intact skeletal muscle mitochondria, frozen-thawed mitochondria and digitonin-disrupted submitochondrial particles was localized ultrastructurally after incubation in a Wachstein-Meisel reaction medium and correlated with chemical ATPase activity. The reaction precipitate was localized within the matrix of intact and partially disrupted mitochondria and between membranous fragments in the submitochondrial particles. These findings are consistent with an ATPase activity residing within the headpieces of the elementary particles of mitochondrial cristae with deposition of reaction precipitate within the adjacent matrix.

Submitted on January 12, 1968


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