title: End group analysis of the cytosolic and mitochondrial fumarases from rat liver.
abstract: Some molecular properties of the cytosolic and mitochondrial fumarases were compared. The carboxyl(C)-terminal amino acid of both the cytosolic and mitochondrial fumarases of rat liver cell was identified as leucine by using carboxypeptidase (CPase) A. As the amino(N)-terminal amino acid of both the cytosolic and mitochondrial fumarases could not be identified by the dansyl chloride method or by the cyanate method, the N-termini of these two fumarases seems to be masked. Both fumarases, after S-carboxymethylation, were completely digested with pronase E and CPase A and B, and the amino acids with blocked amino group were analyzed by high voltage paper electrophoresis and amino acid analysis after acid hydrolysis of these amino acid derivatives. The N-termini of the mitochondrial and cytosolic fumarases were identified as pyroglutamic acid and N-acetylalanine, respectively. To compare the primary structures of the two fumarases in detail, each fumarase was digested with an arginine-specific protease or cleaved with cyanogen bromide. The electrophoretic profiles of the digests of these fumarases were indistinguishable from each other.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002268:Carboxypeptidases / Q000378:metabolism; D003488:Cyanogen Bromide; D003600:Cytosol / Q000201:enzymology; D005649:Fumarate Hydratase / Q000302:isolation & purification*; D007527:Isoenzymes / Q000302:isolation & purification; D007700:Kinetics; D008099:Liver / Q000201:enzymology*; D008297:Male; D008930:Mitochondria, Liver / Q000201:enzymology*; D010446:Peptide Fragments / Q000032:analysis; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000596:Amino Acids; D007527:Isoenzymes; D010446:Peptide Fragments; D002268:Carboxypeptidases; D005649:Fumarate Hydratase; D003488:Cyanogen Bromide