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2014 ; 94
(3
): 739-77
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Selenoproteins: molecular pathways and physiological roles
#MMPMID24987004
Labunskyy VM
; Hatfield DL
; Gladyshev VN
Physiol Rev
2014[Jul]; 94
(3
): 739-77
PMID24987004
show ga
Selenium is an essential micronutrient with important functions in human health
and relevance to several pathophysiological conditions. The biological effects of
selenium are largely mediated by selenium-containing proteins (selenoproteins)
that are present in all three domains of life. Although selenoproteins represent
diverse molecular pathways and biological functions, all these proteins contain
at least one selenocysteine (Sec), a selenium-containing amino acid, and most
serve oxidoreductase functions. Sec is cotranslationally inserted into nascent
polypeptide chains in response to the UGA codon, whose normal function is to
terminate translation. To decode UGA as Sec, organisms evolved the Sec insertion
machinery that allows incorporation of this amino acid at specific UGA codons in
a process requiring a cis-acting Sec insertion sequence (SECIS) element. Although
the basic mechanisms of Sec synthesis and insertion into proteins in both
prokaryotes and eukaryotes have been studied in great detail, the identity and
functions of many selenoproteins remain largely unknown. In the last decade,
there has been significant progress in characterizing selenoproteins and
selenoproteomes and understanding their physiological functions. We discuss
current knowledge about how these unique proteins perform their functions at the
molecular level and highlight new insights into the roles that selenoproteins
play in human health.