Abstract
The SELB protein from Escherichia coli is a specialized elongation factor required for the UGA-directed insertion of the amino acid selenocysteine into selenopolypeptides. Discrimination of the UGA codon requires the presence of a recognition element within the mRNA, which is located at the 3' side of the UGA codon; a hairpin structure can be formed within this mRNA region. By gel shift assays, a specific interaction between SELB and the mRNA recognition element could be demonstrated. Footprinting experiments, using nucleases or iodine as cleaving agents, showed that SELB binds to the loop region of the hairpin structure. In the presence of selenocysteinyl-tRNA, SELB formed a complex with the charged tRNA and the mRNA. The results indicate that targeted insertion of selenocysteine is accomplished by the binding of the SELB protein to this mRNA recognition element, resulting in the formation of a selenocysteinyl-tRNA.SELB complex at the mRNA in the immediate neighborhood of the UGA codon.
MeSH Terms
Bacterial Proteins/isolation & purification,metabolism
Base Sequence
Escherichia coli/genetics,metabolism
Formate Dehydrogenases/genetics
Genes, Bacterial
Hydrogenase/genetics
Models, Genetic
Molecular Sequence Data
Multienzyme Complexes/genetics
Nucleic Acid Conformation
Peptide Elongation Factors/isolation & purification,metabolism
Protein Binding
Protein Biosynthesis
Proteins/genetics
RNA, Messenger/genetics,isolation & purification,metabolism
RNA, Transfer, Amino Acyl/metabolism
Selenoproteins
Substrate Specificity
Transcription, Genetic
Chemicals
Bacterial Proteins
Multienzyme Complexes
Peptide Elongation Factors
Proteins
RNA, Messenger
RNA, Transfer, Amino Acyl
SelB protein, Bacteria
Selenoproteins
selenocysteinyl-tRNA
Hydrogenase
Formate Dehydrogenases
formate hydrogenlyase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Baron C
Lehrstuhl für Mikrobiologie, Universität München, Germany.
Heider J
Böck A
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