>TIGR02666 moaA molybdenum cofactor biosynthesis protein A; InterPro: IPR013483 The majority of molybdenum-containing enzymes utilise a molybdenum cofactor (MoCF or Moco) consisting of a Mo atom coordinated via a cisdithiolene moiety to molybdopterin (MPT). MoCF is ubiquitous in nature, and the pathway for MoCF biosynthesis is conserved in all three domains of life. MoCF-containing enzymes function as oxidoreductases in carbon, nitrogen, and sulphur metabolism , . In Escherichia coli, biosynthesis of MoCF is a three stage process. It begins with the MoaA and MoaC conversion of GTP to the meta-stable pterin intermediate precursor Z. The second stage involves MPT synthase (MoaD and MoaE), which coverts precursor Z to MPT; MoeB is involved in the recycling of MPT synthase. The final step in MoCF synthesis is the attachment of mononuclear Mo to MPT, a process that requires MoeA and which is enhanced by MogA in an Mg2 ATP-dependent manner . MoCF is the active co-factor in eukaryotic and some prokaryotic molybdoenzymes, but the majority of bacterial enzymes requiring MoCF, need a modification of MTP for it to be active; MobA is involved in the attachment of a nucleotide monophosphate to MPT resulting in the MGD co-factor, the active co-factor for most prokaryotic molybdoenzymes. Bacterial two-hybrid studies have revealed the close interactions between MoeA, MogA, and MobA in the synthesis of MoCF . Moreover the close functional association of MoeA and MogA in the synthesis of MoCF is supported by fact that the known eukaryotic homologues to MoeA and MogA exist as fusion proteins: CNX1 () of Arabidopsis thaliana (Mouse-ear cress), mammalian Gephryin (e.g. Q9NQX3 from SWISSPROT) and Drosophila melanogaster (Fruit fly) Cinnamon (P39205 from SWISSPROT) . This entry represents the bacterial form of MoaA (molybdenum cofactor biosynthesis protein A). The MoaA protein is a member of the wider S-adenosylmethionine(SAM)-dependent enzyme family which catalyze the formation of protein and/or substrate radicals by reductive cleavage of SAM via a [4Fe-4S] cluster. Monomeric and homodimeric forms of MoaA have been observed in vivo, and it is not clear what the physiologically relevant form of the enzyme is . The core of each monomer consists of an incomplete TIM barrel, formed by the N-terminal region of the protein, containing a [4Fe-4S] cluster. The C-terminal region of the protein, which also contains a [4Fe-4S] cluster consists of a beta-sheet covering the lateral opening of the barrel, an extended loop and three alpha helices. The N-terminal [4Fe-4S] cluster is coordinated with 3 cysteines and an exchangeable SAM molecule, while the C-terminal [4Fe-4S], also coordinated with 3 cysteines, is the binding and activation site for GTP .; GO: 0046872 metal ion binding, 0006777 Mo-molybdopterin cofactor biosynthetic process.

Probab=98.86  E-value=1.3e-07  Score=76.65  Aligned_cols=199  Identities=17%  Similarity=0.242  Sum_probs=141.1

Q ss_pred             CEEEEE--ECCCCCCCCCCCCHHHH-------HHHHHHHHHHHHHHHHHHHHHCCCCEEEEECCCCCEEEECCCCCCCCC
Q ss_conf             257874--12332446811100122-------137641005889998876310133105873145411341134443100
Q gi|255764472|r  176 VTAFLT--IQEGCDKFCTFCVVPYT-------RGIEISRSLSQVVDEARKLIDNGVCEITLLGQNVNAWRGKGLDGEKCT  246 (469)
Q Consensus       176 ~~a~ik--I~~GC~~~CsfC~ip~~-------RG~~rSr~~~~Iv~ei~~l~~~G~kEi~L~g~d~~~Y~g~~~~~~~~~  246 (469)
T Consensus         8 ~~~YLRiSvTDRCNlRC~YCMP~~~FG~~~~f~~~~~~Lt~eEi~rl~~~~v~~Gv~KvRlTG-------GEPL--lR~~   78 (346)
T TIGR02666         8 RIDYLRISVTDRCNLRCVYCMPEEGFGEGLDFLPKEELLTFEEIERLVRAFVGLGVRKVRLTG-------GEPL--LRKD   78 (346)
T ss_pred             EEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHCCCEEEEEEC-------CCCC--CCCC
T ss_conf             323577876164787246668865678876678755668989999999999974971687527-------7744--1367


Q ss_pred             CCHHHHHHHCCCC--CCCCCCCCCCCCCCCCHHHHHHCCCCCCCCCEEEEEECCCHHHHHHHCC-CCCCCHHHHHHHHHH
Q ss_conf             0216788620444--3001354421000100036652022111220133211145789987303-334411467899987
Q gi|255764472|r  247 FSDLLYSLSEIKG--LVRLRYTTSHPRDMSDCLIKAHGDLDVLMPYLHLPVQSGSDRILKSMNR-RHTAYEYRQIIDRIR  323 (469)
Q Consensus       247 l~~Ll~~l~~i~~--~~riR~~s~~P~~~~~~li~~~~~~~~i~~~lhlpiQSgs~~vLk~M~R-~~~~e~~~~~i~~~r  323 (469)
T Consensus        79 l~~lv~~~~~~~g~~~~di~lTT-NG~~L-~~~a~~L~eAG--L~rvNvSLDsLd~~~F~~It~~~~~l~~Vl~Gi~aA~  154 (346)
T TIGR02666        79 LVELVARLAALPGIEIEDIALTT-NGLLL-ERHAKDLKEAG--LKRVNVSLDSLDPERFAKITRRGGRLEQVLAGIDAAL  154 (346)
T ss_pred             HHHHHHHHHHCCCCCCCEEEECC-CHHHH-HHHHHHHHHCC--CCCEEEEEECCCHHHHHHHHCCCCCHHHHHHHHHHHH
T ss_conf             58999999842785433554100-52235-88999999718--8803654014888999998578998889999999999


Q ss_pred             HH-CCCCCCCEEEECCCCCCHHHHHHHHHHHHHHHHHHHCCCHHEEECCCH-HHHHCCCCCCHHHHHHHH
Q ss_conf             40-134432000001352201247898863322101110020000111201-232143688989999999
Q gi|255764472|r  324 SV-RPDIAISSDFIVGFPGETDDDFRATMDLVDKIGYAQAFSFKYSPRLGT-PGSNMLEQVDENVKAERL  391 (469)
Q Consensus       324 ~~-~p~~~i~tdiIvGfPgETeedf~~Tl~~i~~~~~~~~~vf~yS~r~gT-~Aa~m~~qV~~~vk~~R~  391 (469)
T Consensus       155 ~~Gl~~vKlN~V~~---~G~Nd~Ei~~l~~~~~~~~~~lRFI-E~MP~G~~~~~~~~~~~~~~~~~l~~~  220 (346)
T TIGR02666       155 EAGLKPVKLNTVVL---RGVNDDEIVDLAEFAKERGVTLRFI-ELMPLGEGGNGWRGKEFVSADEILERL  220 (346)
T ss_pred             HCCCCCEEEEEEEC---CCCCHHHHHHHHHHHHHCCCEEEEE-EECCCCCCCCCCCCCCCCCHHHHHHHH
T ss_conf             65998314766762---7889778999999997579607887-515467630000003453589999999