T. Koyama

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Citations132
Highly Influential Citations3
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Phosphorylation of farnesol by a cell-free system from Botryococcus braunii.
TLDR
In in vitro experiments with a 10,000 x g supernatant of cell homogenate, squalene was synthesized from farnesyl diphosphate in the presence of NADPH or NADH, but botryococcenes were not synthesized under the same conditions.
Alteration of the product specificities of prenyltransferases by metal ions.
TLDR
Effect of several kinds of metal ions on the chain-length distribution of reaction products of polyprenyl diphosphate synthases was investigated and remarkable effects were observed with Mn2+ than with Co2+.
Variable product specificity of solanesyl pyrophosphate synthetase.
Formation of farnesal and 3-hydroxy-2,3-dihydrofarnesal from farnesol by protoplasts of Botryococcus braunii.
TLDR
Feeding experiments showed that both farnesal and 3-hydroxy-2,3-dihydrofarnesal were efficiently incorporated into botryococcenes, triterpenoid hydrocarbons of the alga.
Isolation of 10-hydroxypheophorbide a as a photosensitizing pigment from alcohol-treated Chlorella cells.
A new pigment causing intense photosensitivity in rats was isolated from alcohol-treated Chlorella cells and identified as 10-hydroxypheophorbide a by chemical analysis, chromatography, and visible,…
Different roles of the diphosphate moieties of allylic and homoallylic diphosphates in prenyltransferase reaction.
Formation of a stable and catalytically active complex of the two essential components of hexaprenyl diphosphate synthase from Micrococcus luteus B-P 26.
A selective inactivation of dimethylallyl-transfering activity of prenyltransferase.
Phase relation among serpentine, brucite and forsterite from 200 to 500atm water pressure.
Phase relation among serpentine, brucite and forsterite was examined by test-tube type hydrothermal synthetic experiments at water pressures from 200 to 500 atm. It was confirmed that the tie line…
Substrate specificity of squalene synthetase.
TLDR
Results indicate that the carbon chain length rather than 10,11-double bond is important for the reactivity as substrate for squalene synthetase of pig liver microsomes.