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The process of messenger RNA decapping consists of hydrolysis of the 5' cap structure on the RNA exposing a 5' monophosphate. In eukaryotes, this 5' monophosphate is a substrate for the 5' exonuclease Xrn1 [1] and the mRNA is quickly destroyed. There are many situations which may lead to the removal of the cap, some of which are discussed below ...
This type of cap, with just the (m 7 G) in position is called a cap 0 structure. The ribose of the adjacent nucleotide may also be methylated to give a cap 1. Methylation of nucleotides downstream of the RNA molecule produce cap 2, cap 3 structures and so on. In these cases the methyl groups are added to the 2' OH groups of the ribose sugar.
In many cells these pits and complexes begin to concentrate in one area of a cell. Cytochemically, this appears as patches of label on the cell surface (patching). Eventually, the patches coalesce to form a cap at one pole of the cell (capping). Not all cells form caps, but most do form patches.
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]
A capping agent is used during nanoparticle synthesis to inhibit particle growth and aggregation. The chemical blocks or reduces reactivity at the periphery of the particle—a good capping agent has a high affinity for the new nuclei. [112] Citrate ions or tannic acid function both as a reducing agent and a capping agent.
An Ag + species and a capping agent are added (although the polyol itself is also often the capping agent). The Ag + species is then reduced by the polyol to colloidal nanoparticles. [ 25 ] The polyol process is highly sensitive to reaction conditions such as temperature, chemical environment, and concentration of substrates.
Dimercaprol has long been the mainstay of chelation therapy for lead or arsenic poisoning, [7] and it is an essential drug. [6] It is also used as an antidote to the chemical weapon Lewisite . Nonetheless, because it can have serious adverse effects , researchers have also pursued development of less toxic analogues, [ 7 ] such as succimer .
CAPS is the common name for 3-(Cyclohexylamino)-1-propanesulfonic acid, a chemical used as buffering agent in biochemistry. The similar substance N-cyclohexyl-2-hydroxyl-3-aminopropanesulfonic acid (CAPSO) is also used as buffering agent in biochemistry. Its useful pH range is 9.7-11.1.