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Although they are called untranslated regions, and do not form the protein-coding region of the gene, uORFs located within the 5' UTR can be translated into peptides. [1] The 5' UTR is upstream from the coding sequence. Within the 5' UTR is a sequence that is recognized by the ribosome which allows the ribosome to bind and initiate translation.
The Atlas of UTR Regulatory Activity (AURA), [1] a biological database, now at its second version, [2] is a manually curated and comprehensive catalog of human 5' and 3' untranslated sequences (UTR) and UTR regulatory annotations. It includes basic annotation, phylogenetic conservation, binding sites for RNA-binding proteins and miRNA, cis ...
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Another form of translational regulation in eukaryotes comes from unique elements on the 5′ UTR called upstream open reading frames (uORF). These elements are fairly common, occurring in 35–49% of all human genes. [17] A uORF is a coding sequence located in the 5′ UTR located upstream of the coding sequences initiation site.
In molecular genetics, the three prime untranslated region (3′-UTR) is the section of messenger RNA (mRNA) that immediately follows the translation termination codon. The 3′-UTR often contains regulatory regions that post-transcriptionally influence gene expression .
The first 150 to 200 nucleotides within the 5′ UTR of Alphacoronaviruses are highly structured and shown to be conserved on the structural level. The 5′ UTRs are predicted to contain three conserved stem-loops: [3] SL1 is important for viral replication, most likely playing a role in the template-switch of viral subgenomic RNA (sgRNA ...
The 3′ UTR of Alphacoronaviruses consists of two small hairpins (PK-SL2) which can form an alternate conformation (PK-SL1) where the loop region of the second hairpin interacts with the stem of the first hairpin (see Coronavirus 3′ UTR pseudoknot). PK-SL2 has been confirmed in HCoV-229E and HCoV-NL63 by in vitro structure probing experiments.