Leader: Andrey B. Vartapetian
The Department of Chemistry and Biochemistry of Nucleoproteins was established in 1969 by Prof. Alexey A. Bogdanov, Academician of The Russian Academy of Sciences. Since 2003, the Department has been headed by Prof. Andrey B. Vartapetian. The research focus of the Department teams is in the field of molecular and cellular biology. Investigations are aimed at the elucidation of molecular mechanisms of programmed cell death, protein biosynthesis, cell signaling, and plant-pathogen interactions. Research areas We are investigating:
Mechanisms of programmed cell death in plants Programmed cell death (PCD) in animals and plants display both common features and important distinctions. Plants lack caspases that are key proteases involved in apoptosis in animals. We have identified plant proteolytic enzymes as a plant counterpart of caspases and named these novel proteases ‘phytaspases’ (Chichkova et al., Plant Cell 2004; EMBO J. 2010). Though being structurally distinct from caspases, phytaspases share aspartate cleavage specificity (Galiullina et al., J. Biol. Chem. 2015) and a role in PCD analogous to that of caspases. The most striking distinction of phytaspases is their dynamic localization that is dependent on vesicular membrane trafficking. After being constitutively processed/activated and secreted from healthy plant cells (Chichkova et al., EMBO J. 2010), phytaspases utilize clathrin-mediated endocytosis to re-enter cells committed to cell death (Trusova et al., J. Exp. Bot. 2019). Several protein targets of phytaspases were identified. These studies have uncovered a role for phytaspases in mediating defense signaling in plants through precursor processing and maturation of the wound hormone systemin (Beloshistov et al., New Phytol. 2018). Thus, phytaspases appear to possess multiple functions. Regulatory proteins Results in other directions are coming soon. Educational activities
State Prize of the Russian Federation in Science and Technology (I.Shatsky, 1986; Y.Dorokhov, 1994), State Young Scientist Prize (А.Vartapetian, 1982), European Academy Prize (S.Dmitriev, 2005; D.Andreev, 2007; I.Terenin, 2009), Russian Academy of Sciences Medal for Young Scientists (S.Dmitriev, 2008). |
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Laboratories
In human cells, the mechanism of activation of the p53 tumor suppressor in response to mitochondrial dysfunction is being studied. We are investigating anti-apoptotic and proliferation-related properties of the nuclear human protein Prothymosin alpha.
Laboratory is concerned with mechanisms of translation in eukaryotes and translational control. Main directions: cap-independent translation initiation of viral and cellular mRNA in mammalian cells, regulatory mechanisms using 5'- and 3'-UTR, functions of initiation factors of translation etc.
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