Tomoko Ohshima

Learn More
Although cyclin-dependent kinase 5 (Cdk5) is closely related to other cyclin-dependent kinases, its kinase activity is detected only in the postmitotic neurons. Cdk5 expression and kinase activity are correlated with the extent of differentiation of neuronal cells in developing brain. Cdk5 purified from nervous tissue phosphorylates neuronal cytoskeletal(More)
The cerebral cortex of mice with a targeted disruption in the gene for cyclin-dependent kinase 5 (cdk5) is abnormal in its structure. Bromodeoxyuridine labeling reveals that the normal inside-out neurogenic gradient is inverted in the mutants; earlier born neurons are most often found superficial to those born later. Despite this, the early preplate layer(More)
Although the precise mechanisms of the conversion of predentin to dentin are not well understood, several lines of evidence implicate the noncollagenous proteins (NCPs) as important regulators of dentin biomineralization. Here we compared the in vivo temporospatial expression patterns of two dentin NCP genes, dentin matrix protein 1 (Dmp1), and dentin(More)
Fabry disease is an X-linked inherited metabolic disorder that is caused by a deficiency of alpha-galactosidase A (alpha-Gal A). Progressive deposition of neutral glycosphingolipids that have terminal a-linked galactosyl moieties in vascular endothelial cells causes renal failure along with premature myocardial infarctions and strokes in patients with this(More)
Glutamate dehydrogenase (L-glutamate: NADP oxidoreductase, deaminating, EC from the hyperthermophilic archaebacteria Pyrococcus woesei and P. furiosus were purified to homogeneity from crude extracts. The enzymes had similar enzymological properties: molecular mass, subunit structure, optimum pHs for the oxidative deamination and reductive(More)
The distribution of bacterial leucine dehydrogenase (L-leucine:NAD+ oxidoreductase, deaminating, EC was investigated, and Bacillus sphaericus (IFO 3525) was found to have the highest activity of the enzyme. Leucine dehydrogenase, which was purified to homogeneity and crystallized from B. sphaericus, has a molecular weight of about 245,000 and(More)
Cyclin-dependent kinase 5 (Cdk5) is a member of the family of cell cycle-related kinases. Previous neuropathological analysis of cdk5(-/-) mice showed significant changes in CNS development in regions from cerebral cortex to brainstem. Among the defects in these animals, a disruption of the normal pattern of cell migrations in cerebellum was particularly(More)
Over the last decade, amino acid dehydrogenases such as alanine dehydrogenase (Ala DH), leucine dehydrogenase (Leu DH), and phenylalanine dehydrogenase (Phe DH) have been applied to the enantiomer-specific synthesis and analysis of various amino acids. In perticular, amino acid dehydrogenases from thermophiles have received much attention because of their(More)
The distribution of dye-linked L-amino acid dehydrogenases was investigated in several hyperthermophiles, and the activity of dye-linked L-proline dehydrogenase (dye-L-proDH, L-proline:acceptor oxidoreductase) was found in the crude extract of some Thermococcales strains. The enzyme was purified to homogeneity from a hyperthermophilic archaeon, Thermococcus(More)
Cyclin-dependent kinase 5 (Cdk5) null mice exhibit a unique phenotype characterized by perinatal mortality, disrupted cerebral cortical layering attributable to abnormal neuronal migration, lack of cerebellar foliation, and chromatolytic changes of neurons in the brainstem and the spinal cord. Because Cdk5 is expressed in both neurons and astrocytes, it has(More)