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(Received for publication, January 14, 1997, and in revised form, February 27, 1997)
From the Department of Molecular Physiology and Biological Physics,
University of Virginia Medical School,
Charlottesville, Virginia 22906
Chromatography on immobilized antibodies specific
to nucleoside diphosphate (NDP) kinase was utilized for affinity
purification of this enzyme from detergent extracts of frog heart
post-mitochondrial fractions. SDS-polyacrylamide gel electrophoresis
analysis of eluates from these supports shows that five polypeptides
co-purify with nucleoside diphosphate (NDP) kinase. Tryptic digests of
each band were analyzed by mass spectrometric microsequencing. Data base searches by peptide mass matching and sequence homology led to the
identification of these proteins as glyceraldehyde-3-phosphate dehydrogenase (40 kDa), creatine kinase (45 kDa), vimentin (55 kDa),
pyruvate kinase (60 kDa), and a putative member of the antioxidant protein family (28 kDa). Distinct protein compositions were found in
eluates of lung and liver extracts processed in a like manner. The
28-kDa band and vimentin were associated with NDP kinase from all
tissues, but co-purification of pyruvate kinase was seen only in liver,
while creatine kinase and glyceraldehyde-3-phosphate dehydrogenase were
absent from eluates from lung and liver. The results suggest that while
NDP kinase is associated with vimentin intermediate filaments and an
antioxidant protein in most tissues, it interacts with energy
metabolism enzymes in a tissue-specific manner.
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