Tobacco acid pyrophosphatase
Appearance
Tobacco Acid Pyrophosphatase (TAP) is an enzyme that catalyses the hydrolysis of a phosphoric ester bond in a broad spectrum of molecules[1], including the 5'-end of mRNA.
During mRNA maturation the 5' triphosphate of the new mRNA molecule is rapidly removed. The diphosphate 5' end then attacks the α-phosphorus atom of a methylated GTP to form a very unusual 5'-5' triphosphate linkage, called cap.[2] The advantage of the TAP lies in its specificity to hydrolyse a phosphodiester bound of this particular structure, releasing a mRNA molecule with only one phosphate group in the 5'-end.[3]
References
- ^ Shinshi H, Miwa M, Kato K, Noguchi M, Matsushima T, Sugimura T. (1976). "A novel phosphodiesterase from cultured tobacco cells". Biochemistry. 18: 2185-90. PMID 6041.
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: CS1 maint: multiple names: authors list (link) - ^ JEREMY M. BERG; JOHN L. TYMOCZKOL; LUBERT STRYER (2002). Biochemistry (28.3.1 ed.).
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: CS1 maint: multiple names: authors list (link)Online version - ^ Lockard, RE; Rieser, L; Vournakis JN. (1981). "Labeling of eukaryotic messenger RNA 5' terminus with phosphorus -32: use of tobacco acid pyrophosphatase for removal of cap structures". Gene Amplif Anal. 2: 229–51.
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: CS1 maint: multiple names: authors list (link)