Protein
Bifunctional oligoribonuclease and PAP phosphatase NrnA
Organism
Mycoplasma pneumoniae (strain ATCC 29342 / M129)
Function
Bifunctional enzyme which has both oligoribonuclease and pAp-phosphatase activities. Degrades RNA and DNA oligonucleotides with a length of 5 nucleotides and shorter, with a preference for longer oligomers. Also degrades 11- and 24-mers, but less efficiently. Directionality is controversial; shown to degrade 5-mers and less in a 3' to 5' direction (PubMed:22114320), and 11-mers in a 5' to 3' direction (PubMed:21087930). Converts 3'(2')-phosphoadenosine 5'-phosphate (PAP) to AMP.
Similarity
Belongs to the NrnA oligoribonuclease family.
Sequence
MNSQVHRKGSIAEAVSAIQAHDKIVIFHHIRPDGDCLGAQHGLARLIQTNFPHKQVFCVGDPKHNFPWLEMVFTPKEQITPELMQQALAVIVDANYKERIECRDLLDQNQFKAVLRIDHHPNEDDLNTTHNFVDASYIAAAEQVVDLAVQAKWKLSPPAATALYLGIYTDSNRFLYSNTSWRTLYLGSMLYRAQANIAKIHDELNHTSLKDIQFKQYVFKNFQTFQNVIYFVADKKFQKKLKVTPLECARVNILANIEQFHIWLFFIEEGKNHYRVEFRSNGINVREVALKYGGGGHIQASGAVLKSKRDIIRVVQDCQKQIAV