|Superclasses:||Reactions Classified By Conversion Type → Simple Reactions → Chemical Reactions|
|Reactions Classified By Substrate → Macromolecule Reactions → Polynucleotide-Reactions → RNA-Reactions → tRNA-Reactions|
EC Number: 188.8.131.52
Supersedes EC number: 184.108.40.206
Note that this reaction equation differs from the official Enzyme Commission reaction equation for this EC number, which can be found here .
The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.
Mass balance status: Balance undetermined; a substrate lacks a chemical formula
Enzyme Commission Primary Name: exoribonuclease II
Enzyme Commission Synonyms: ribonuclease II, ribonuclease Q, BN ribonuclease, Escherichia coli exo-RNase II, RNase II, exoribonuclease (misleading), 5'-exoribonuclease (misleading)
Enzyme Commission Summary:
Preference for single-stranded RNA. The enzyme processes 3′-terminal extra-nucleotides of monomeric tRNA precursors, following the action of EC 220.127.116.11 ribonuclease P.
Instance reaction of [a tRNA precursor + H2O → a tRNA + a nucleoside 5'-monophosphate] (18.104.22.168):
i1: a tRNA precursor with a 5' extension and a long 3' trailer + H2O → a tRNA precursor with a 5' extension + a ribonucleoside 5'-monophosphate (22.214.171.124)
Schmidt78: Schmidt FJ, McClain WH (1978). "An Escherichia coli ribonuclease which removes an extra nucleotide from a biosynthetic intermediate of bacteriophage T4 proline transfer RNA." Nucleic Acids Res 5(11);4129-39. PMID: 364422
Shimura78: Shimura Y, Sakano H, Nagawa F (1978). "Specific ribonucleases involved in processing of tRNA precursors of Escherichia coli. Partial purification and some properties." Eur J Biochem 86(1);267-81. PMID: 350582
Sporn69: Sporn MB, Lazarus HM, Smith JM, Henderson WR (1969). "Studies on nuclear exoribonucleases. 3. Isolation and properties of the enzyme from normal and malignant tissues of the mouse." Biochemistry 8(4);1698-706. PMID: 5805304
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