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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
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Presence of selenocysteine in proteins in E.coli is a consequence of
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The Sec residues are ribosomally incorporated into these proteins by a unique tRNA, tRNASec, bearing a UCA anticodon that is specified by a particular (in the mRNA) UGA codon. The Sec–tRNASec is synthesized by the aminoacylation of tRNASec with L-serine by the same Ser-tRNA synthetase that charges tRNASer, followed by the enzymatic selenylation of the resulting Ser residue. Sec–tRNASec bound by a specific elongation factor named SELB, a homolog of EF-Tu, that in its complex with GTP is recruited to a ribosomally bound mRNA stem–loop structure in the selenoprotein coding region on the 3' side of the UGA codon specifying Sec.