RNA 3-terminal phosphate cyclase(RTCA) Homo sapiens This gene encodes a member of the RNA 3-phosphate cyclase family. The encoded protein plays a role in RNA metabolism by catalyzing the ATP-dependent conversion of the 3-phosphate of RNA substrates to a 2,3-cyclic phosphodiester. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Feb 2012],catalytic activity:ATP + RNA 3-terminal-phosphate = AMP + diphosphate + RNA terminal-2,3-cyclic-phosphate.,function:Catalyzes the conversion of 3-phosphate to a 2,3-cyclic phosphodiester at the end of RNA. The mechanism of action of the enzyme occurs in 3 steps: (A) adenylation of the enzyme by ATP, (B) the enzyme acts on RNA-N3P to produce RNA-N3PP5A, (C) a non catalytic nucleophilic attack by the adjacent 2hydroxyl on the phosphorus in the diester linkage to produce the cyclic end product. The biological role of this enzyme is unknown but it is likely to function in some aspects of cellular RNA processing.,similarity:Belongs to the RNA 3-terminal cyclase family. Type 1 subfamily.,subunit:Monomer.,tissue specificity:Ubiquitous.,
