>cd00553 NAD_synthase NAD+ synthase is a homodimer, which catalyzes the final step in de novo nicotinamide adenine dinucleotide (NAD+) biosynthesis, an amide transfer from either ammonia or glutamine to nicotinic acid adenine dinucleotide (NaAD). The conversion of NaAD to NAD+ occurs via an NAD-adenylate intermediate and requires ATP and Mg2+. The intemediate is subsequently cleaved into NAD+ and AMP. In many prokaryotes, such as E. coli , NAD synthetase consists of a single domain and is strictly ammonia dependent. In contrast, eukaryotes and other prokaryotes have an additional N-terminal amidohydrolase domain that prefer glutamine, Interestingly, NAD+ synthases in these prokaryotes, can also utilize ammonia as an amide source .

Probab=98.27 E-value=6.9e-06 Score=55.54 Aligned_cols=156 Identities=19% Similarity=0.084 Sum_probs=72.0 Q ss_pred CCCCEEEEEECCHHHHHHHHHHHHC-C-CEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHHHHHCCCCCEEEECHHHCC Q ss_conf 5994899980965699999999974-9-8399999767788777279999999999999888752035615875011032 Q gi|254781031|r 7 KAPSALLLFSGGQDSSTCLSWALDR-F-DRVETLSFDYGQRNKVELECRLCVRKKIVELMPKWKDSLGEDHILPLAILGD 84 (240) Q Consensus 7 ~~~~av~l~SGGlDS~~~l~~l~~~-~-~~v~~i~~~ygq~~~~~~~~a~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 84 (240) T Consensus 22 g~~~~viGlSGGIDSav~a~La~~Alg~~~v~~v~mP~~~ss~~s~~~A~~la~~l----------gi~~~~i~I~~~~~ 91 (248) T cd00553 22 GFKGVVLGLSGGIDSALVAALAVRALGRENVLALFMPSRYSSEETREDAKELAEAL----------GIEHVNIDIDPAVE 91 (248) T ss_pred CCCCEEEECCCCHHHHHHHHHHHHHCCCCEEEEEECCCCCCCHHHHHHHHHHHHHH----------CCCEEEECHHHHHH T ss_conf 99919995888899999999999972887599988999789875899999999995----------89168715599999 Q ss_pred CCCCCCCCCHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEECCCCCCCCCCCCCCCHHHHHHHHHHHHHCCCC Q ss_conf 24443322201100012331011111112233377777743399365114544443455544302477777677530643 Q gi|254781031|r 85 ISHSSLTKNVAMKIQDNNLPNTFVPGRNIIFLVFAATLAYRLGITNIVIGVCETDYSGYPDCRHDTIRAIETAINLGMES 164 (240) Q Consensus 85 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~a~~~g~~~i~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 164 (240) T Consensus 92 ~~~~~~~~~~~~~~~~~~~~NiqaRl----Rm~~Ly~~An~~~~lVlgTgNksE~~~Gy~-----------T----kyGD 152 (248) T cd00553 92 AFLALLGESGGSELEDLALGNIQARL----RMVILYALANKLGGLVLGTGNKSELLLGYF-----------T----KYGD 152 (248) T ss_pred HHHHHHHHHCCCCHHHHHHHHHHHHH----HHHHHHHHHHHCCCEEECCCCHHHHHHCCC-----------E----ECCC T ss_conf 99998644048705567874248788----899999999744998962874607875721-----------0----0078 Q ss_pred CEEEEEEECCCCHHHHHHHHHHHCCCH Q ss_conf 216775313898899999999828200 Q gi|254781031|r 165 HVTVHTPLMWLKKYETWKLAQDIGGQD 191 (240) Q Consensus 165 ~~~i~~P~~~~tK~eI~~~~~~~~~~~ 191 (240) T Consensus 153 ~~~d~~Pi~~L~Kt~V~~la~~l~vp~ 179 (248) T cd00553 153 GAADINPIGDLYKTQVRELARYLGVPE 179 (248) T ss_pred CCCCCCCCCCCCHHHHHHHHHHHCCHH T ss_conf 775822136884999999999968889

HHsearch alignment for GI: 254781031 and conserved domain: cd00553