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Domain II of elongation factor SelB This subfamily represents the domain of elongation factor SelB that is homologous to domain II of EF-Tu. SelB may function by replacing EF-Tu. In prokaryotes, the incorporation of selenocysteine as the 21st amino acid, encoded by TGA, requires several elements: SelC is the tRNA itself, SelD acts as a donor of reduced selenium, SelA modifies a serine residue on SelC into selenocysteine, and SelB is a selenocysteine-specific translation elongation factor. 3' or 5' non-coding elements of mRNA have been found as probable structures for directing selenocysteine incorporation.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",