ECHEVARRÍA RUIZ DE VARGAS , Cristina

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El objeto de este trabajo es el estudio de la regulación del proceso de fosforilación in vitro de la PEPC fotosintética (EC 4,1,1,31) de plantas C4 (Sorghun vulgare) y CAM (Kalanchoe blossfeldiana) nuestros resultados muestran que: 1) En extractos crudos de hojas de Sorgo y de Kalanchoe la fosforilación in vitro a partir de 32p-atp de la PEPC...

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Conceptos generales del metabolismo; crecimiento y desarrollo; actividades enzimáticas; niveles de adenilatos; efecto del nitrógeno; actividad nitrato reductasa en relación con la nutrición nitrogenada; la fosfoenolpiruvato piruvato carboxilasa; inhibición del espigado; niveles de prolina; respuesta varietal al estrés hídrico e identificación y...

Species in 47 families of the Odiel Maarshes Natural Park were examined for the presence (+) or absence (—) of the Kranz leaf anatomy type. as well for a circadian variation in tritatable acidity and cellular pH. Species of Cyperaceae. Poeceae. Chenopodiaceae and Eilphorbiaceae posseses Kranz (+) leaf anatomy and a significative circandian...

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Maize leaf phosphoenolpyruvate carboxylase [PEPC; orthophosphate:oxaloacetate carboxy-lyase (phosphorylating), EC 4.1.1.31] protein-serine kinase (PEPC-PK) phosphorylates serine-15 of its target enzyme, thus leading to an increase in catalytic activity and a concomitant decrease in malate sensitivity of this cytoplasmic C4 photosynthesis enzyme...

Nitrate reductase from spinach (Spinacia oleracea L.) leaves, which had been inactivated in vitro by incubation with N A D H and cyanide, was fully reactivated in minutes when irradiated in anaerobic conditions with red light in the presence o f m ethylene blue. Both the rate and the extent of reactivation increased with light intensity ( 6 to...

Phosphoenolpyruvate carboxylase (PEPC; E.C. 4.1.1.31) was characterized in developing and germinating sorghum seeds, focusing on the transcript and polypeptide abundance of multiple plant-type phosphoenolpyruvate carboxylase (PTPC) genes, and the post-translational modification of each isoenzyme by phosphorylation versus monoubiquitination...

Three plant-type phosphoenolpyruvate carboxylase (PPC1 to PPC3) and two phosphoenolpyruvate carboxylase kinase (PPCKs: PPCK1 and 2) genes are present in the Arabidopsis thaliana genome. In seeds, all PPC genes were found to be expressed. Examination of individual ppc mutants showed little reduction of PEPC protein and global activity, with the...

The photosynthetic phosphoenolpyruvate carboxylase (C4-PEPC) is regulated by phosphorylation by a phosphoenolpyruvate carboxylase kinase (PEPC-k). In Digitaria sanguinalis mesophyll protoplasts, this light-mediated transduction cascade principally requires a phosphoinositide-specific phospholipase C (PI-PLC) and a Ca2+-dependent step. The...