>TIGR00078 nadC nicotinate-nucleotide pyrophosphorylase; InterPro: IPR004393 Nicotinate-nucleotide pyrophosphorylase (2.4.2.19 from EC), also known as quinolinate phosphoribosyltransferase (decarboxylating), catalyses the conversion of nicotinate D-ribonucleotide, pyrophosphate and carbon dioxide into pyridine-2,3-dicarboxylate and 5-phospho-alpha-D-ribose 1-diphosphate. This enzyme is a type II phosphoribosyltransferase which provides the de novo source of nicotinate mononucleotide (NAMN) for NAD biosynthesis in both prokaryotes and eukaryotes , . Structural studies have shown that the active form of this enzyme is a homodimer with an unsual fold , , . The N-terminal forms a mixed alpha/beta domain, while the C-terminal region forms a multi-stranded, open alpha/beta barrel. The active site is found at the C-terminal ends of the beta strands of the alpha/beta barrel, and is bordered by the N-terminal domain of the second subunit of the dimer. It contains several conserved charged residues thought to be important determinants of substrate binding and catalysis. ; GO: 0004514 nicotinate-nucleotide diphosphorylase (carboxylating) activity, 0019363 pyridine nucleotide biosynthetic process.

Probab=95.34 E-value=0.26 Score=28.72 Aligned_cols=121 Identities=20% Similarity=0.317 Sum_probs=72.5 Q ss_pred EEEEEEEE---C-CHHHHHHCCC-C---------CCEEEE---ECCCCCCHHHHHHHHHHCCCEEEEEEECCCC---HHH Q ss_conf 85678851---2-0336764047-7---------607999---7066421589998677649825998523334---478 Q gi|254780975|r 66 DCHLMISS---I-DSHINIIADA-G---------CDIITF---HPESSPHIRRSLRTIHAMGKKTGVAINPETP---VAI 125 (224) Q Consensus 66 dvHLMv~~---P-~~~i~~~~~~-g---------~d~i~~---H~E~~~~~~~~i~~i~~~g~k~Giai~p~T~---~~~ 125 (224) T Consensus 122 ~~~i~dTRKTTPGLR~~EKyAVr~GGG~nHR~~LsDavmiKDNHi~~~Gs~~~Av~~aR~~---~~~~~kiEVEVenlE~ 198 (276) T TIGR00078 122 KVRIADTRKTTPGLRLLEKYAVRVGGGDNHRLGLSDAVMIKDNHIAAAGSIEKAVKRARAA---LPFAKKIEVEVENLEE 198 (276) T ss_pred CEEEEEEECCCCCCCCEEEEEEEECCCCCCCCCCCCEEEEEECEEECCCCHHHHHHHHHHH---CCCCCEEEEEECCHHH T ss_conf 3389985257874301023135535885786888773897502066068989999999984---8998079986289899 Q ss_pred HHHHH-HHCCEEEEEEEECCCCCCCCCCHHHHHHHHHHHHHHCC--CCEEEEECCCCHHHHHHHHHCCCCEEEECHHHH Q ss_conf 99886-20140289983067765332201357789986543138--652698158998899999967998999742663 Q gi|254780975|r 126 LEDVI-DEIDMILIMTVNPGFGGQQLIESTIPKIRQAKALIGKR--SISLEVDGGVTSRNIKSLVQAGADLLVVGSSFF 201 (224) Q Consensus 126 i~~~l-~~~D~vliM~V~PG~~Gq~f~~~~l~kI~~l~~~~~~~--~~~I~vDGGvn~~~i~~l~~~Gad~~V~Gsaif 201 (224) T Consensus 199 a~eA~~AGADiImL---------DNm~p~~~---~~av~~~~~~~p~~~~EaSGGitl~n~~~ya~~gVD~IS~G~lTh 265 (276) T TIGR00078 199 AEEAAEAGADIIML---------DNMKPEEI---KEAVELLKGRNPNVLVEASGGITLDNIEEYAETGVDVISSGALTH 265 (276) T ss_pred HHHHHHCCCCEEEC---------CCCCHHHH---HHHHHHHHHCCCEEEEEEECCCCHHHHHHHHHCCCCEEECCCHHH T ss_conf 99999709959980---------69894799---999999970299089998369987899998408975883274112

HHsearch alignment for GI: 254780975 and conserved domain: TIGR00078