2',3'-cyclic-nucleotide 2'-phosphodiesterase/5'- or 3'-nucleotidase, 5'-nucleotidase family [Nucleotide transport and metabolism, Defense mechanisms].

Escherichia coli CpdB and related proteins, N-terminal metallophosphatase domain. CpdB is a bacterial periplasmic protein with an N-terminal metallophosphatase domain and a C-terminal 3'-nucleotidase domain. This alignment model represents the N-terminal metallophosphatase domain, which has 2',3'-cyclic phosphodiesterase activity, hydrolyzing the 2',3'-cyclic phosphates of adenosine, guanosine, cytosine and uridine to yield nucleoside and phosphate. CpdB also hydrolyzes the chromogenic substrates p-nitrophenyl phosphate (PNPP), bis(PNPP) and p-nitrophenyl phosphorylcholine (NPPC). CpdB is thought to play a scavenging role during RNA hydrolysis by converting the non-transportable nucleotides produced by RNaseI to nucleosides which can easily enter a cell for use as a carbon source. This family also includes YfkN, a Bacillus subtilis nucleotide phosphoesterase with two copies of each of the metallophosphatase and 3'-nucleotidase domains. The N-terminal metallophosphatase domain belongs to a large superfamily of distantly related metallophosphatases (MPPs) that includes: Mre11/SbcD-like exonucleases, Dbr1-like RNA lariat debranching enzymes, YfcE-like phosphodiesterases, purple acid phosphatases (PAPs), YbbF-like UDP-2,3-diacylglucosamine hydrolases, and acid sphingomyelinases (ASMases). MPPs are functionally diverse, but all share a conserved domain with an active site consisting of two metal ions (usually manganese, iron, or zinc) coordinated with octahedral geometry by a cage of histidine, aspartate, and asparagine residues. The conserved domain is a double beta-sheet sandwich with a di-metal active site made up of residues located at the C-terminal side of the sheets. This domain is thought to allow for productive metal coordination.

multifunctional 2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase/5'-nucleotidase.

bifunctional 2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase.

bifunctional 2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase.

ChainA, 5' nucleotidase family protein [Staphylococcus aureus subsp. aureus COL]

ChainA, Uncharacterized protein [Staphylococcus aureus subsp. aureus NCTC 8325]

Crystalstructure of calcineurin-like phosphoesterase YfkN from Bacillus subtilis [Bacillus subtilis subsp. subtilis str. 168],3GVE_B Crystal structure of calcineurin-like phosphoesterase YfkN from Bacillus subtilis [Bacillus subtilis subsp. subtilis str. 168]

1.45Angstrom Crystal Structure of Bifunctional 2',3'-cyclic Nucleotide 2'-phosphodiesterase/3'-Nucleotidase Periplasmic Precursor Protein from Yersinia pestis with Phosphate bound to the Active site [Yersinia pestis CO92]

Putative5'-Nucleotidase (c4898) from Escherichia Coli in complex with Uridine [Escherichia coli O6],3IVD_B Putative 5'-Nucleotidase (c4898) from Escherichia Coli in complex with Uridine [Escherichia coli O6],3IVE_A Putative 5'-Nucleotidase (c4898) from Escherichia Coli in complex with Cytidine [Escherichia coli O6]

Trifunctional nucleotide phosphoesterase protein YfkN OS=Bacillus subtilis (strain 168) OX=224308 GN=yfkN PE=1 SV=1

2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase OS=Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) OX=71421 GN=cpdB PE=3 SV=1

2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase OS=Escherichia coli (strain K12) OX=83333 GN=cpdB PE=1 SV=2

2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase OS=Yersinia enterocolitica OX=630 GN=cpdB PE=3 SV=1

2',3'-cyclic-nucleotide 2'-phosphodiesterase/3'-nucleotidase OS=Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) OX=99287 GN=cpdB PE=3 SV=2