Artículo

Duek, P.D.; Wolosiuk, R.A. "Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins" (2001) Biochimica et Biophysica Acta - Protein Structure and Molecular Enzymology. 1546(2):299-311
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Abstract:

The stroma of higher plant chloroplasts contains two thioredoxins (Trx) with different specificity for the reduction of protein disulfide bonds. Based upon electrostatic features of domains that participate in the thiol/disulfide exchange, we prepared mutants of rapeseed Trx-m bearing opposite charges at a single position and subsequently analyzed their action on the activation of rapeseed chloroplast fructose 1,6-phosphate (CFBPase). The replacement of Pro-35 with lysine and glutamic residues enhanced and impaired, respectively, the stimulation of CFBPase relative to the wild-type and the P35A mutant. Furthermore, the shielding of electrostatic interactions with high concentrations of KCl greatly increased and concurrently made indistinguishable the affinity of all variants for CFBPase. The capacity to stimulate the enzyme activity likewise was enhanced concertedly by fructose-1,6-bisphosphate and Ca2+ but, at variance with the action of KCl, remained sensitive to charges in the side chain of mutants. These results were consistent with a mechanism in which intermolecular electrostatic interactions and intramolecular non-covalent interactions control the formation of the non-covalent complex between reduced Trx and oxidized CFBPase and, in so doing, modulate the thiol/disulfide exchange. © 2001 Elsevier Science B.V.

Registro:

Documento: Artículo
Título:Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins
Autor:Duek, P.D.; Wolosiuk, R.A.
Filiación:Instituto Leloir, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Patricias Argentinas 435, 1405 Buenos Aires, Argentina
Palabras clave:Chloroplast fructose 1,6-phosphate; Electrostatic interaction; Rapeseed; Redox regulation; Thioredoxin; calcium ion; disulfide; fructose 1,6 bisphosphate; fructose bisphosphatase; glutamic acid; isoenzyme; lysine; mutant protein; potassium chloride; proline; protein; thiol; thioredoxin; article; Brassica; chloroplast; concentration response; electrochemistry; enzyme activation; enzyme activity; molecular interaction; phytochemistry; priority journal; protein domain; protein protein interaction; reaction analysis; reduction; surface charge; Amino Acid Substitution; Brassica; Calcium; Chloroplasts; Computer Simulation; Electrophoresis, Polyacrylamide Gel; Enzyme Activation; Fructose-Bisphosphatase; Fructosediphosphates; Models, Molecular; Molecular Sequence Data; Mutagenesis, Site-Directed; Potassium Chloride; Protein Binding; Protein Folding; Structure-Activity Relationship; Substrate Specificity; Thermodynamics; Thioredoxin; Embryophyta; Sinapis arvensis
Año:2001
Volumen:1546
Número:2
Página de inicio:299
Página de fin:311
DOI: http://dx.doi.org/10.1016/S0167-4838(01)00150-9
Título revista:Biochimica et Biophysica Acta - Protein Structure and Molecular Enzymology
Título revista abreviado:Biochim. Biophys. Acta Protein Struct. Mol. Enzymol.
ISSN:01674838
CODEN:BBAED
CAS:Calcium, 7440-70-2; fructose-1,6-diphosphate, 488-69-7; Fructose-Bisphosphatase, EC 3.1.3.11; Fructosediphosphates; Potassium Chloride, 7447-40-7; Thioredoxin, 52500-60-4
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01674838_v1546_n2_p299_Duek

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Citas:

---------- APA ----------
Duek, P.D. & Wolosiuk, R.A. (2001) . Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins. Biochimica et Biophysica Acta - Protein Structure and Molecular Enzymology, 1546(2), 299-311.
http://dx.doi.org/10.1016/S0167-4838(01)00150-9
---------- CHICAGO ----------
Duek, P.D., Wolosiuk, R.A. "Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins" . Biochimica et Biophysica Acta - Protein Structure and Molecular Enzymology 1546, no. 2 (2001) : 299-311.
http://dx.doi.org/10.1016/S0167-4838(01)00150-9
---------- MLA ----------
Duek, P.D., Wolosiuk, R.A. "Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins" . Biochimica et Biophysica Acta - Protein Structure and Molecular Enzymology, vol. 1546, no. 2, 2001, pp. 299-311.
http://dx.doi.org/10.1016/S0167-4838(01)00150-9
---------- VANCOUVER ----------
Duek, P.D., Wolosiuk, R.A. Rapeseed chloroplast thioredoxin-m modulation of the affinity for target proteins. Biochim. Biophys. Acta Protein Struct. Mol. Enzymol. 2001;1546(2):299-311.
http://dx.doi.org/10.1016/S0167-4838(01)00150-9