Properties of plasma membrane H+ -ATPase in salt-treated Populus euphratica callus.
The plasma membrane (PM) vesicles from Populus euphratica (P. euphratica) callus were isolated to investigate the properties of the PM H(+)-ATPase. An enrichment of sealed and oriented right-side-out PM vesicles was demonstrated by measurement of the purity and orientation of membrane vesicles in the upper phase fraction. Analysis of pH optimum, temperature effects and kinetic properties showed that the properties of the PM H(+)-ATPase from woody plant P. euphratica callus were consistent with those from herbaceous species. Application of various thiol reagents to the reaction revealed that reduced thiol groups were essential to maintain the PM H(+)-ATPase activity. In addition, there was increased H(+)-ATPase activity in the PM vesicles when callus was exposed to NaCl. Western blotting analysis demonstrated an enhancement of H(+)-ATPase content in NaCl-treated P. euphratica callus compared with the control.
Yang
Yingli
Y
School of Life Science, Northwest Normal University, Lanzhou, PR China. yangyingli2006@sohu.com
Zhang
Feng
F
Zhao
Meigui
M
An
Lizhe
L
Zhang
Lixin
L
Chen
Nianlai
N
D002462:Cell Membrane / Q000201:enzymology*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010940:Plant Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry; D032107:Populus / Q000737:chemistry / Q000201:enzymology* / Q000254:growth & development; D006180:Proton-Translocating ATPases / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000378:metabolism*; D012965:Sodium Chloride / Q000494:pharmacology; D013439:Sulfhydryl Reagents / Q000494:pharmacology; D013696:Temperature
D010940:Plant Proteins; D013439:Sulfhydryl Reagents; D012965:Sodium Chloride; D006180:Proton-Translocating ATPases