Some aspects of the phosphomonoesterase activity of Endamoeba histolytica

Blumenthal, Herbert; Michaelson, Joseph B.; DeLamater, James N.

doi:10.1016/0014-4894(55)90025-4

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Cited by 5 publications

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“…Acid phosphatases appear to be more prevalent than alkaline phosphatases in heterotrophic protists due to the role of these enzymes in digestive processes (Müller, 1967;Eeckhout, 1973). Like phytoplankton, however, some heterotrophic protists also have phosphatases that are active in the alkaline pH range (Blumenthal et al, 1955;Hunter, 1957;Bowers and Korn, 1973;Letelier et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Phosphatase activity in the heterotrophic dinoflagellate Pfiesteria shumwayae

2006

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Section: Introductionmentioning

confidence: 99%

Phosphatase activity in the heterotrophic dinoflagellate Pfiesteria shumwayae

2006

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Distribution in Nature

McComb

Bowers

Posen

1979

Alkaline Phosphatase

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A comparison of the non-specific acid phosphomonoesterase activity in the larva ofPhocanema decipiens (Nematoda) with that of the muscle of its host the codfish (Gadus morhua)

Goil

Harpur

1979

Z. Parasitenkd.

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The non-specific phosphomonoesterase (enzyme I) extracted from the larva of the codworm (Phocanema decipiens) is different from the enzyme (enzyme II) from the muscle of its host, the codfish (Gadus morhua). The pH optima were 4.0 and 4.5, and the KM values for p-nitrophenyl phosphate hydrolysis were 1.8 mM and 6.5 mM for enzymes I and II respectively. The specific specific activity in units (0.01 mumol/min) per mg protein was 4.80 +/- 0.85 and 0.54 +/- 0.07 for enzymes I and II respectively. The specific activity from uninfected muscles was only 0.39 (SD +/- 0.017) units per mg of protein. Both enzymes were inhibited by NaF, HgCl2, and cysteine but were stimulated by 2-mercaptoethanol. EDTA and iodoacetamide had no effect on enzyme I but enzyme II was activated by EDTA and inhibited by iodoacetamide. Cadmium ions inhibited both the enzymes but a conspicuous feature with enzyme II was in the increase in percentage inhibition by lowering the concentration of CD2+.

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Some aspects of the phosphomonoesterase activity of Endamoeba histolytica

Cited by 5 publications

References 10 publications

Phosphatase activity in the heterotrophic dinoflagellate Pfiesteria shumwayae

Phosphatase activity in the heterotrophic dinoflagellate Pfiesteria shumwayae

Distribution in Nature

A comparison of the non-specific acid phosphomonoesterase activity in the larva ofPhocanema decipiens (Nematoda) with that of the muscle of its host the codfish (Gadus morhua)

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