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Use of IRES sequences in molecular biology soon became common as a tool for expressing multiple genes from a single transcriptional unit in a genetic vector. In such vectors, translation of the first cistron is initiated at the 5' cap, and translation of any downstream cistron is enabled by an IRES element appended at its 5' end. [3]
The Tobamovirus internal ribosome entry site (IRES) is an element that allows cap and end-independent translation of mRNA in the host cell. [1] The IRES achieves this by mediating the internal initiation of translation by recruiting a ribosomal 43S pre-initiation complex directly to the initiation codon and eliminates the requirement for the eukaryotic initiation factor, eIF4F.
This family represents the Picornavirus internal ribosome entry site (IRES) element present in their 5' untranslated region. [1] These elements were discovered in picornaviruses. [ 2 ] They are cis-acting RNA sequences that adopt diverse three-dimensional structures, recruit the translation machinery and that often operate in association with ...
The RBS in prokaryotes is a region upstream of the start codon. This region of the mRNA has the consensus 5'-AGGAGG-3', also called the Shine-Dalgarno (SD) sequence. [1] The complementary sequence (CCUCCU), called the anti-Shine-Dalgarno (ASD) is contained in the 3’ end of the 16S region of the smaller (30S) ribosomal subunit.
HAV IRES, entero-/rhinovirus and cardio-/apthovirus IRES are all approximately 450 nt but differ greatly in their structures. A cardiovirus, EMCV, and an apthovirus, foot-and-mouth disease virus (FMDV) share about 50% identical IRES elements. HCV-like picornavirus IRES incorporates the most difference in IRES elements from the other three classes.
The N-myc internal ribosome entry site (IRES) is an RNA element found in the n-myc gene. The myc family of genes when expressed are known to be involved in the control of cell growth, differentiation and apoptosis. n-myc mRNA has an alternative method of translation via an internal ribosome entry site where ribosomes are recruited to the IRES located in the 5' UTR thus bypassing the typical ...
The c-sis internal ribosome entry site (IRES) is a RNA element found in the 5' UTR of the PDGF beta chain gene. The internal ribosome entry site contains three modules that can individually mediate internal ribosome entry. However, the full length sequence is required for maximal IRES activity.
The c-myc internal ribosome entry site (IRES) is an RNA element present in the 5' UTR of the mRNA of C-myc and allows cap-independent translation. The mammalian c-myc gene is a proto-oncogene which is required for cell proliferation, transformation and death. c-myc mRNA has an alternative method of translation via internal ribosome entry where ribosomes are recruited to the IRES located in the ...