[Multifunctional protein complex NAC (nascent polypeptide associated complex]статья

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[1] Kogan G. L., Gvozdev V. A. [multifunctional protein complex nac (nascent polypeptide associated complex] // Molekuliarnaia biologiia. — 2014. — Vol. 48, no. 2. — P. 223–231. The functions of the evolutionary conservative complex NAC (Nascent polypepetide Associated Complex) and its subunits are discussed. The heterodimeric NAC protein contains alpha- and beta-subunits and is found to be reversibly bounded to the ribosome in all eukaryotes, from yeast to humans. NAC contacts the nascent polypeptide and protects it from proteolysis. NAC participates in polypeptide chain folding and modulates protein secretion and transmembrane protein formation. Mutations and deletions of genes, encoding NAC subunits are lethal in early development of multicellular eukaryotes. NAC is involved in the ribosome biogenesis. The beta-subunit interacts with caspase-3 and may be involved in the regulation of the apoptotic pathway. The variants of NAC proteins can be considered as chaperone complexes, involved in the response of the cell and the organism to stress factors, as well as regulators of apoptosis. The genes encoding beta-subunits are rapidly evolved, their duplications cause the formation of tissue specific beta-subunit variants with a different number of putative caspase cleavage sites. The homodimer of alpha-subunits is shown to be the RNA/DNA binding protein and acts as a transcriptional cofactor. The diversity in the functioning of NAC is a prime example of a protein that performs a variety of biological functions (moonlighting protein).

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