Lactate dehydrogenase in Phycomyces blakesleeanus

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Lactate dehydrogenase in Phycomyces blakesleeanus.

1. An NAD-specific L(+)-lactate dehydrogenase (EC 1.1.1.27) from the mycelium of Phycomyces blakesleeanus N.R.R.L. 1555 (-) was purified approximately 700-fold. The enzyme has a molecular weight of 135,000-140,000. The purified enzyme gave a single, catalytically active, protein band after polyacrylamide-gel electrophoresis. It shows optimum activity between pH 6.7 and 7.5. 2. The Phycomyces bl...

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Isocitrate lyase from Phycomyces blakesleeanus

Isocitrate lyase was purified from Phycomyces blakesleeanus N.R.R.L. 1555(-). The native enzyme has an Mr of 240000. The enzyme appeared to be a tetramer with apparently identical subunits of Mr 62000. The enzyme requires Mg2+ for activity, and the data suggest that the Mg2+-isocitrate complex is the true substrate and that Mg2+ ions act as a nonessential activator. The kinetic mechanism of the...

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Mutations affecting sexual development in Phycomyces blakesleeanus.

Although zygospore (mature zygote) formation in P. blakeslleeanus occurs in liquid glucoseglutamate medium, morphological observations are made more easily when cultures are grown on 1-mm-thick agar medium. Zygophores (sexually differentiated hyphae) develop prior to physical contact in crosses of (plus) and (minus) wild types. Zygophores interlock upon contact and then undergo six successive m...

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Isolation and characterization of Phycomyces blakesleeanus ferritin.

Ferritin was isolated from the fungus Phycomyces blakesleeanus and compared biochemically and immunologically with horse spleen ferritin. Phycomyces and horse spleen ferritins were shown to exhibit similar electrophoretic patterns on polyacrylamide gels. Both preparations yielded an identical single band on sodium dodecyl sulfate-containing polyacrylamide gels. Tryptic digests of Phycomyces fer...

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Inhibition of Carotene Biosynthesis in Cell Extracts of Phycomyces blakesleeanus

Cell extracts o f the Cl 15 (^-carotene-accumulating) strain o f Phycomyces blakesleeanus were incubated with either [2-l4C]MVA or [1-I4C]IPP and a range o f possible inhibitors of carotenogenesis, including bleaching herbicides, biphenyl com pounds and geranylacetone. Several o f these compounds were potent inhibitors o f /7-carotene formation and caused the accumulation o f phytoene. No other...

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ژورنال

عنوان ژورنال: Biochemical Journal

سال: 1982

ISSN: 0264-6021

DOI: 10.1042/bj2030383