RPSBLAST alignment for GI: 254780787 and conserved domain: cd01889

>gnl|CDD|133289 cd01889, SelB_euk, SelB subfamily. SelB is an elongation factor needed for the co-translational incorporation of selenocysteine. Selenocysteine is coded by a UGA stop codon in combination with a specific downstream mRNA hairpin. In bacteria, the C-terminal part of SelB recognizes this hairpin, while the N-terminal part binds GTP and tRNA in analogy with elongation factor Tu (EF-Tu). It specifically recognizes the selenocysteine charged tRNAsec, which has a UCA anticodon, in an EF-Tu like manner. This allows insertion of selenocysteine at in-frame UGA stop codons. In E. coli SelB binds GTP, selenocysteyl-tRNAsec and a stem-loop structure immediately downstream of the UGA codon (the SECIS sequence). The absence of active SelB prevents the participation of selenocysteyl-tRNAsec in translation. Archaeal and animal mechanisms of selenocysteine incorporation are more complex. Although the SECIS elements have different secondary structures and conserved elements between archaea and eukaryotes, they do share a common feature. Unlike in E. coli, these SECIS elements are located in the 3' UTRs. This group contains eukaryotic SelBs and some from archaea. Length = 192
 Score = 67.0 bits (164), Expect = 2e-11
 Identities = 44/167 (26%), Positives = 76/167 (45%), Gaps = 24/167 (14%)

Query: 386 VTIMGHVDHGKTSLLDAI-RKADVA------KGEIGGITQHIG------------AYQVA 426
           V ++GHVD GKTSL  A+   A  A      + +  GIT  +G               + 
Sbjct: 3   VGVLGHVDSGKTSLAKALSEIASTAAFDKNPQSQERGITLDLGFSSFYVDKPKHLRELIN 62

Query: 427 YQGKN--ITFLDTPGHAAFYEMRARGARVTDIAVLVLAADEEIMPQAIESINHAKAADVS 484
              +N  IT +D PGHA+       GA++ D+ +LV+ A + I  Q  E +   +     
Sbjct: 63  PGEENLQITLVDCPGHASLIRTIIGGAQIIDLMLLVVDATKGIQTQTAECLVIGEILCKK 122

Query: 485 IIVAINKIDKLGADPQKVRMSLLK---HDVFVESMGGDILDVEISAK 528
           +IV +NKID +  + ++ ++  +K        ++   +   + +SAK
Sbjct: 123 LIVVLNKIDLIPEEERERKIEKMKKKLQKTLEKTRFKNSPIIPVSAK 169