>cd01713 PAPS_reductase This domain is found in phosphoadenosine phosphosulphate (PAPS) reductase enzymes or PAPS sulphotransferase. PAPS reductase is part of the adenine nucleotide alpha hydrolases superfamily also including N type ATP PPases and ATP sulphurylases. A highly modified version of the P loop, the fingerprint peptide of mononucleotide-binding proteins, is present in the active site of the protein, which appears to be a positively charged cleft containing a number of conserved arginine and lysine residues. Although PAPS reductase has no ATPase activity, it shows a striking similarity to the structure of the ATP pyrophosphatase (ATP PPase) domain of GMP synthetase, indicating that both enzyme families have evolved from a common ancestral nucleotide-binding fold. The enzyme uses thioredoxin as an electron donor for the reduction of PAPS to phospho-adenosine-phosphate (PAP) . It is also found in NodP nodulation protein P from Rhizobium meliloti which has ATP sulphurylase acti

Probab=98.29 E-value=2.3e-05 Score=58.57 Aligned_cols=164 Identities=21% Similarity=0.224 Sum_probs=103.6 Q ss_pred CEEEEECCCCHHHHHHHHHHHHCCC--CEEEEEECCCCCCCCCHHHHHHHHHHCCCCCEEEEEHHHHHHHH----HCCCC Q ss_conf 0366405640477999999862236--56999973895515627899998862369857997588999999----66898 Q gi|254780414|r 224 RVICAVSGGVDSTVAAFLIYEAIGI--NLTCVLVDHGFMRKNEVENIISLFKGYPNFPLRVVDASERFIRK----LKNIV 297 (520) Q Consensus 224 kVi~~lSGGVDStV~A~Ll~kAig~--~l~~vfVD~GllRknE~~~v~~~~~~~~~~~l~~vda~~~Fl~~----L~gv~ 297 (520) T Consensus 1 ~~~vsfSGGKDS~vll~L~~~~~~~~~~~~vvf~DTg~e-~pet~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 79 (173) T cd01713 1 NVVVSFSGGKDSTVLLHLALKALPELKPVPVIFLDTGYE-FPETYEFVDRVAERYGLPLVVVRPPDSPAEGLALGLKGFP 79 (173) T ss_pred CEEEEECCHHHHHHHHHHHHHHCCCCCCEEEEEECCCCC-CHHHHHHHHHHHHHCCCEEEEEECCCCHHHHHHHHCCCCC T ss_conf 959996464999999999999665558837999688898-9899999999998739907999689728999986135779 Q ss_pred CHHHHHHHHHH-HHHHHHHHHHHHCCCCEEEEECCCCCHHHHHHCCCCCCCCEEEEEECCCCHHHHHCCCHHHHHHHHHH Q ss_conf 88999988756-58999999997439970998646220245420246777630344302320113203202237898738 Q gi|254780414|r 298 DPETKRKVIGQ-LFIEVFEEEAKKIGGAQFLGQGTLYPDVIESISFFGGPSSIIKSHHNVGGLPEHMDMKLVEPLKELFK 376 (520) Q Consensus 298 DPE~KRkiIG~-~Fi~vf~~~a~~~~~~~~L~QGTlypDvIES~~~~~~~~~~IKsHHNvgglp~~~~~~liEPl~~l~K 376 (520) T Consensus 80 ~~~~~~~~c~~~~K~~P~~~~~~~~-~~~~~~~GiR~~---Es~~R--~~~~~~~~~~~---~~---~~~~~~Pi~~Wt~ 147 (173) T cd01713 80 LPSPDRRWCCRILKVEPLRRALKEL-GVVAWITGIRRD---ESARR--ALLPVVWTDDG---KG---GILKVNPLLDWTY 147 (173) T ss_pred CCCCCHHHHHHHHHHHHHHHHHHHC-CCCEEEEECCCC---CCHHH--CCCCCCCCCCC---CC---CEEEEECHHHCCH T ss_conf 9832268898888078999999832-982899941214---62444--43762343268---89---9899932285999 Q ss_pred HHHHHHHHHHCCCHHHHCCCCCCC Q ss_conf 999999998199988942688898 Q gi|254780414|r 377 DEVRLLGKELRLPDSFVERHPCPG 400 (520) Q Consensus 377 dEVR~lg~~Lglp~~~~~RhPFPG 400 (520) T Consensus 148 ~dVw~yi~~~~l~~~~LY~~gy~s 171 (173) T cd01713 148 EDVWAYLARHGLPYNPLYDQGYRS 171 (173) T ss_pred HHHHHHHHHCCCCCCCHHHCCCCC T ss_conf 999999998399999178758987

HHsearch alignment for GI: 254780414 and conserved domain: cd01713