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In molecular biology, the five-prime cap (5′ cap) is a specially altered nucleotide on the 5′ end of some primary transcripts such as precursor messenger RNA.This process, known as mRNA capping, is highly regulated and vital in the creation of stable and mature messenger RNA able to undergo translation during protein synthesis.
The NAD+ 5' cap has been observed in bacteria, [3] contrary to the long-held belief that prokaryotes lacked 5'-capped RNA, [4] as well as on the 5' cap of eukaryotic mRNA, [5] in place of the m7G cap. This modification also potentially allows for selective degradation of RNA]within prokaryotes as different pathways are involved in the ...
mRNA-4157/V940 is an mRNA based cancer vaccine. When administered, it will produce one of several dozen possible abnormal proteins commonly found in cancerous tissues. The production of those proteins is intended to invoke an immune response. mRNA-4157/V940 is given to patients after their tumors have been sequenced and abnormal proteins ...
Capping changes the five prime end of the mRNA to a three prime end by 5'-5' linkage, which protects the mRNA from 5' exonuclease, which degrades foreign RNA. The cap also helps in ribosomal binding. In addition, it represents a unique mark for a correct gene. Therefore, it helps to select the mRNA that is going to be translated.
Transcription of mRNAs initiated by viral polymerase using cap snatching. The first step of transcription for some negative, single-stranded RNA viruses is cap snatching, in which the first 10 to 20 residues of a host cell RNA are removed (snatched) and used as the 5′ cap and primer to initiate the synthesis of the nascent viral mRNA. [1]
It has a molecular weight of ~800 kDa and controls the assembly of the 40S ribosomal subunit on mRNA that have a 5' cap or an IRES. eIF3 may use the eIF4F complex, or alternatively during internal initiation, an IRES, to position the mRNA strand near the exit site of the 40S ribosomal subunit, thus promoting the assembly of a functional pre ...
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