Wyniki wyszukiwania

1

The plant Nudix hydrolase family

100%

Kraszewska E.

Acta Biochimica Polonica

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2008

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tom 55

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nr 4

663-671

Nudix hydrolases are a family of proteins defined by a conserved amino-acid sequence GX5-EX7REUXEEXGU, where U is a hydrophobic residue. These enzymes are widely distributed among all classes of organisms and catalyze, with varying degrees of substrate specificity, the hydrolysis of a variety of nucleoside diphosphate derivatives: nucleoside di- and triphosphates and their oxidized forms, dinucleoside polyphosphates, nucleotide sugars, NADH, coenzyme A and the mRNA cap. Nudix proteins are postulated to control the cellular concentration of these compounds. The genome of the model plant Arabidopsis thalianacontains 29 genes coding for putative Nudix hydrolases. Recently, several Arabidopsis Nudix genes have been cloned and their products characterized. This review summarizes current knowledge on these plant enzymes and discusses their possible cellular functions.

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Research on catecholases, laccases and cresolases in plants. Recent progress and future needs.

100%

Aniszewski T., Lieberei R., Gulewicz K.

Acta Biologica Cracoviensia. Series Botanica

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2008

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tom 50

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nr 1

Polyphenol oxidases (PPOs) reveal a range of forms and occur in all plants and crops. PPOs are comprised of three enzymes (catecholase, laccase, cresolase) with very different activities and specificities. Cresolase has a dualistic form (cresolase is only in plants and tyrosinase is only in animals and microorganisms). Very often in the literature the generic word "PPO" is used inappropriately as one enzyme. This should be avoided in future studies, as clear systematics and correct nomenclature of PPOs are needed for proper research. PPOs have different substrate specificities and typical inhibitors, and they catalyze hydroxylation and oxidation processes in plants. Pigment formation in cells and cellular systems is affected by active PPOs. Catecholases, laccases and cresolases are encoded by nuclear genes of plants. Various PPO DNA sequences have been found, and PPOs occur in multiple gene families. The protective potential of PPOs in plants and enhanced herbivory resistance is debated, and the final evidence has not yet appeared. The activity of PPOs in germination is recognized, but its mechanism is still not clear. Seed testa coloration in Arabidopsis thaliana is effected by laccase and not by catecholase. The TT10 gene encoding laccase in the Arabidopsis seed testa has been isolated. Arabidopsis genome analysis led to the identification of 16 other putative laccases and their genes, named AtLAC1 to AtLAC17 according to their position in the genome. Challenging areas of research for the future are seed testa PPOs and their mobilization in endosperm and micropylar regions, and PPOs as a part of the plant defense system and immunity.

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Composition of fractions of esterase and maleic dehydrogenase in the leaves of healthy pea plants and infected with bean yellow mosaic virus

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Kaniewski W., Micinski B., Blaszczak W.

Prace Naukowe Instytutu Ochrony Roślin

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1980

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tom 22

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nr 2

4

Methanetrisphosphonate and its adenine nucleotide derivatives as inhibitors of human and plant diadenosine tetraphosphate hydrolases

100%

Maksel D., Gayler K., Liu X., Blackburn M., McLennan A. G., Guranowski A.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 3

5

Plasmalemma H - ATPase of plant and yeast origin

100%

Kotyk A.

Biophysics of Membrane Transport

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1992

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tom 11

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nr 1

Ograniczanie wyników

1 Acta Biochimica Polonica

1 Acta Biologica Cracoviensia. Series Botanica

1 Biophysics of Membrane Transport

1 Cellular and Molecular Biology Letters

1 Prace Naukowe Instytutu Ochrony Roślin

1 Aniszewski T.

1 Blackburn M.

1 Blaszczak W.

1 Gayler K.

1 Gulewicz K.

1 Guranowski A.

1 Kaniewski W.

1 Kotyk A.

1 Kraszewska E.

1 Lieberei R.

1 Liu X.

1 Maksel D.

1 McLennan A. G.

1 Micinski B.

2 2008

1 1999

1 1992

1 1980

The plant Nudix hydrolase family

Research on catecholases, laccases and cresolases in plants. Recent progress and future needs.

Composition of fractions of esterase and maleic dehydrogenase in the leaves of healthy pea plants and infected with bean yellow mosaic virus

Methanetrisphosphonate and its adenine nucleotide derivatives as inhibitors of human and plant diadenosine tetraphosphate hydrolases

Plasmalemma H - ATPase of plant and yeast origin