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Biomedical subjects

M Ono

Publications and source records attributed to M Ono.

At least 937 records · Page 52Linked to original sources
PubMed1978

Membrane-bound arylamidase from human hepatoma cells having the same electrophoretic mobility as placental membrane-bound arylamidase.

A membrane-bound arylamidase from well-differentiated hepatocellular carcinoma having the same electrophoretic mobility as placental membrane-bound arylamidase was found. The enzyme was found to be a sialoprotein and was activated by Co2+. Hepatoma membrane-bound arylamidase had a similar molecular weight (240 000) and kinetic properties to normal liver membrane-bound arylamidase, but differed from the liver enzyme with respect to electrophoretic mobility, heat stability and urea inactivation.

Aminopeptidases↗
PubMed1977

Gene affecting longevity of messenger RNA: a mutant of Escherichia coli with altered mRNA stability.

We have screened 897 temperature sensitive growth mutants of E. coli for mutant strains showing longer mRNA half-life. The fate of pulse-labelled RNA was examined at 42 degrees C after cessation of RNA synthesis and with prior exposure to nonpermissive temperature (42 degrees C). Eight stains showed altered turnover of RNA (presumably mRNA), and further analysis on mutant strain JE15144 indicated that the stability of pulse-labeled RNA as well as of tryptophan (trp) mRNA increased four to seven fold over its parental strain at 42 degrees C. At 4 min or 10 min after addition of rifampicin, some 70 to 80% of polyribosome in the growing cells could still be conserved in JE15144 cultured at the nonpermissive temperature while little, if any, polyribosomes remained in its parental strain (PA3092) under the same condition. Two generation times were required for complete stoppage of growth of this mutant strain after shifting to 42 degrees C, and protein synthesis continued at a significant, but slightly reduced, rate at 42 degrees C. However, functional decay of mRNA in the mutant strain, with respect to the capacity for producing peptides, appeared to be similar to the parent strain, with half-lives of 3.5 min in PA3092 and 4.7 min in JE15144.

Bacterial Proteins↗
PubMed1977

Genetic analysis of mutations affecting ribonuclease II in Escherichia coli.

Exonuclease activity in an Escherichia coli K12 mutant S296 is less than 1% of that in the wild type strain (Nikolaev et al., 1976). Another mutant N464 has thermolabile ribonuclease II (Castles and Singer, 1968; Kuwano et al., 1969). Genetic analysis of these mutants by Hfr conjugation and P1 transduction indicates that the structural gene (rnb) for ribonuclease II is located near the pyrF gene (28 min on the E. coli genetic map of Bachmann, Low and Taylor (1976)), and the most probable gene order is tyrT-trp-pyrF-rnb.

Chromosome Mapping↗