Peer-Reviewed Journal Details
Mandatory Fields
Karmous, I,Chaoui, A,Jaouani, K,Sheehan, D,El Ferjani, E,Scoccianti, V,Crinelli, R
2014
March
Plant Physiology and Biochemistry
Role of the ubiquitin-proteasome pathway and some peptidases during seed germination and copper stress in bean cotyledons
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WOS: 28 ()
Optional Fields
Aminopeptidase Chymotrypsin Copper Germination Proteasome Trypsin Ubiquitin PROTEIN-DEGRADATION OXIDATIVE STRESS 20S PROTEASOME PHASEOLUS-VULGARIS HIGHER-PLANTS CADMIUM RESPONSES ACCUMULATION INHIBITORS ENZYMES
76
77
85
The role of the ubiquitin (Ub)-proteasome pathway and some endo- and aminopeptidases (EPs and APs, respectively) was studied in cotyledons of germinating bean seeds (Phaseolus vulgaris L). The Ub system appeared to be important both in the early (3 days) and late (9 days) phases of germination. In the presence of copper, an increase in protein carbonylation and a decrease in reduced -SH pool occurred, indicating protein damage. This was associated with an enhancement in accumulation of malondialdehyde, a major product of lipid peroxidation, and an increase in content of hydrogen peroxide (H2O2), showing oxidative stress generation. Moreover, copper induced inactivation of the Ub-proteasome (EC 3.4.25) pathway and inhibition of leucine and proline aminopeptidase activities (EC 3.4.11.1 and EC 3.4.11.5, respectively), thus limiting their role in modulating essential metabolic processes, such as the removal of regulatory and oxidatively-damaged proteins. By contrast, total trypsin and chymotrypsin-like activities (EC 3.4.21.4 and EC 3.4.21.1, respectively) increased after copper exposure, in parallel with a decrease in their inhibitor capacities (i.e. trypsin inhibitor and chymotrypsin inhibitor activity), suggesting that these endoproteases are part of the protective mechanisms against copper stress. (C) 2014 Elsevier Masson SAS. All rights reserved.
10.1016/j.plaphy.2013.12.025
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