Plasma membrane-associated malate dehydrogenase of maize (Zea mays L.) roots: Native versus recombinant protein
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Plasma membrane-associated malate dehydrogenase of maize (Zea mays L.) roots: Native versus recombinant protein. / Menckhoff, Ljiljana; Mielke-Ehret, Nicole; Buck, Friedrich; Vuletić, Mirjana; Lüthje, Sabine.
In: J PROTEOMICS, Vol. 80C, 10.01.2013, p. 66-77.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Plasma membrane-associated malate dehydrogenase of maize (Zea mays L.) roots: Native versus recombinant protein
AU - Menckhoff, Ljiljana
AU - Mielke-Ehret, Nicole
AU - Buck, Friedrich
AU - Vuletić, Mirjana
AU - Lüthje, Sabine
N1 - Copyright © 2013 Elsevier B.V. All rights reserved.
PY - 2013/1/10
Y1 - 2013/1/10
N2 - Malate dehydrogenase (MDH, EC 1.1.1.37) is involved in several cellular processes including plant development, nutrient uptake and oxidative stress. Evidence for a plasma membrane-associated MDH has been presented for maize (Zea mays L.) roots. In the present study isoenzymes of MDH were purified from highly enriched plasma membrane preparations of maize and compared with soluble isoenzymes (Km, pH optima, pI and molecular masses). Modified SDS-PAGE analyses revealed monomers of 41kDa for membrane-associated MDH, whereas monomers (35kDa) and dimers (70kDa) were detected for soluble isoenzymes. Membrane-associated MDH of cauliflower (Brassica oleracea L.) inflorescences and spinach (Spinacia oleracea L.) leaves showed molecular masses similar to the membrane-associated MDH of maize. The specific maize MDH involved was identified by mass spectrometry (ESI-QTOF-MS/MS, MALDI-TOF-MS). The corresponding gene was cloned and the protein was characterised after heterologous expression in Escherichia coli. Enzyme kinetics and properties of the recombinant and native proteins were compared. The function of thiol groups and the presence of disulphide bonds were analysed by the effect of N-ethylmaleimide, diagonal electrophoresis and labelling. Semiquantitative reverse transcription polymerase chain reaction of maize root transcripts demonstrated a constitutive expression of the gene encoding plasma membrane-associated MDH.
AB - Malate dehydrogenase (MDH, EC 1.1.1.37) is involved in several cellular processes including plant development, nutrient uptake and oxidative stress. Evidence for a plasma membrane-associated MDH has been presented for maize (Zea mays L.) roots. In the present study isoenzymes of MDH were purified from highly enriched plasma membrane preparations of maize and compared with soluble isoenzymes (Km, pH optima, pI and molecular masses). Modified SDS-PAGE analyses revealed monomers of 41kDa for membrane-associated MDH, whereas monomers (35kDa) and dimers (70kDa) were detected for soluble isoenzymes. Membrane-associated MDH of cauliflower (Brassica oleracea L.) inflorescences and spinach (Spinacia oleracea L.) leaves showed molecular masses similar to the membrane-associated MDH of maize. The specific maize MDH involved was identified by mass spectrometry (ESI-QTOF-MS/MS, MALDI-TOF-MS). The corresponding gene was cloned and the protein was characterised after heterologous expression in Escherichia coli. Enzyme kinetics and properties of the recombinant and native proteins were compared. The function of thiol groups and the presence of disulphide bonds were analysed by the effect of N-ethylmaleimide, diagonal electrophoresis and labelling. Semiquantitative reverse transcription polymerase chain reaction of maize root transcripts demonstrated a constitutive expression of the gene encoding plasma membrane-associated MDH.
U2 - 10.1016/j.jprot.2012.12.015
DO - 10.1016/j.jprot.2012.12.015
M3 - SCORING: Journal article
C2 - 23313174
VL - 80C
SP - 66
EP - 77
JO - J PROTEOMICS
JF - J PROTEOMICS
SN - 1874-3919
ER -