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Aitkhozhin Institute of Molecular Biology and Biochemistry, Dosmukhamedov str., 80, Almaty, 050012, Republic of KazakhstanR.KryldakovM.А. Aitkhozhin Institute of Molecular Biology and Biochemistry, Dosmukhamedov str., 80, Almaty, 050012, Republic of KazakhstanB.IskakovM.А. Aitkhozhin Institute of Molecular Biology and Biochemistry, Dosmukhamedov str., 80, Almaty, 050012, Republic of KazakhstanTranscriptional factor DEHYDRATION-RESPONSIVE ELEMENT BINDING PROTEIN 2A (DREB2A) induces the expression of many genes in dehydration, heat shock, and salinity in Arabidopsis. Deletion of sequence coding the 30 amino acid central region transforms full length (FL) protein DREB2A FL into a more stable and constitutively active form known as DREB2A CA. Here, using agrobacteria, a leaf disc transformation of Nicotiana tabacum v. Samsun NN was carried out by transgenes AtDREB2A-FL and AtDREB2A-CA coding the proteins with His-tag on the С-end. The effects of combinations of constitutive 35S CaMV promoter or inducible rd29A promoter with different viral or artificial 5’-untranslated regions (UTR), 5’TMV, 5’PVY, 5’AMV or 5’ARC1, known as translational enhancers were evaluated on the both transgenes’ expression. Using an antibody to His-tag, recombinant protein synthesis was detected in transgenic plants in normal and heat shock conditions. After comparative analysis, it was shown that the properties of different 5’-UTRs vary greatly and depended on separate conjunction of promoter and transgene. The integration of AtDREB2A CA under control of the rd29A promoter and 5’TMV or 5’AMV in genome effectively improved tolerance of tobacco transgenic plants to 400 mM NaCl and to drought.7192021719202126027432https://www.naun.org/main/NAUN/bio/2021/a622010-032(2021).pdf10.46300/91011.2021.15.32https://www.naun.org/main/NAUN/bio/2021/a622010-032(2021).pdf10.1007/s00018-012-0990-9L.W. Barrett, S. Fletcher, S.D. 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