A comparison of the immunochemical affinity of cytoplasmic, mitochondrial and nuclear proteins of winter rye (Secale cereale L.) to a 310 kD stress protein in control plants and during exposure to cold stress

An investigation of immunochemical affinity to stress protein CSP 310 prote ins among the native cytoplasmic, mitochondrial and nuclear proteins of win ter rye (Secale cereale L.) was carried out by PAGE-electrophoresis in cont rol plants and in plants during exposure to cold stress. Western blotting s howed that among the native proteins of all cellular fractions of control p lants investigated there was immunochemical affinity to CSP 310 proteins wi th molecular weights about 230 and to a number of proteins of about 140 kD. The protein with molecular weight 310 kD was found only in cytoplasmic and mitochondrial fractions of control plants. Proteins with molecular weights 470 kD and 320-330 kD with immunochemical affinity to CSP 310, were also f ound in the nuclear fraction of control plants. By ethidium bromide stainin g, a cytoplasmic protein with molecular weight 310 kD, as well as nuclear p roteins with weights 470 kD and 320-330 kD, were shown to be nucleoprotein complexes. It was shown that during exposure to cold stress the amounts of cytoplasmic proteins 310 and 470 kD and nuclear protein 320 kD are arises. In mitochondrial fraction new proteins appear of molecular weight 320 and 4 70 kD. By ethidium bromide staining, a cytoplasmic protein with molecular w eight 310 kD, as well as nuclear proteins with weights 470 kD and 320-330 k D;, were shown not to be nucleoprotein complexes during exposure to cold st ress. At the same time cytoplasmic protein with molecular weight 470 kD was shown to be nucleoprotein complex during exposure to cold stress. (C) 2000 Elsevier Science Ltd. All rights reserved.