>TIGR01035 hemA glutamyl-tRNA reductase; InterPro: IPR000343 Tetrapyrroles are large macrocyclic compounds derived from a common biosynthetic pathway . The end-product, uroporphyrinogen III, is used to synthesise a number of important molecules, including vitamin B12, haem, sirohaem, chlorophyll, coenzyme F430 and phytochromobilin . The first stage in tetrapyrrole synthesis is the synthesis of 5-aminoaevulinic acid ALA via two possible routes: (1) condensation of succinyl CoA and glycine (C4 pathway) using ALA synthase (2.3.1.37 from EC), or (2) decarboxylation of glutamate (C5 pathway) via three different enzymes, glutamyl-tRNA synthetase (6.1.1.17 from EC) to charge a tRNA with glutamate, glutamyl-tRNA reductase (1.2.1.70 from EC) to reduce glutamyl-tRNA to glutamate-1-semialdehyde (GSA), and GSA aminotransferase (5.4.3.8 from EC) to catalyse a transamination reaction to produce ALA. The second stage is to convert ALA to uroporphyrinogen III, the first macrocyclic tetrapyrrolic structure in the pathway. This is achieved by the action of three enzymes in one common pathway: porphobilinogen (PBG) synthase (or ALA dehydratase, 4.2.1.24 from EC) to condense two ALA molecules to generate porphobilinogen; hydroxymethylbilane synthase (or PBG deaminase, 2.5.1.61 from EC) to polymerise four PBG molecules into preuroporphyrinogen (tetrapyrrole structure); and uroporphyrinogen III synthase (4.2.1.75 from EC) to link two pyrrole units together (rings A and D) to yield uroporphyrinogen III. Uroporphyrinogen III is the first branch point of the pathway. To synthesise cobalamin (vitamin B12), sirohaem, and coenzyme F430, uroporphyrinogen III needs to be converted into precorrin-2 by the action of uroporphyrinogen III methyltransferase (2.1.1.107 from EC). To synthesise haem and chlorophyll, uroporphyrinogen III needs to be decarboxylated into coproporphyrinogen III by the action of uroporphyrinogen III decarboxylase (4.1.1.37 from EC) . This entry represents glutamyl-tRNA reductase (1.2.1.70 from EC), which reduces glutamyl-tRNA to glutamate-1-semialdehyde during the first stage of tetrapyrrole biosynthesis by the C5 pathway , . This enzyme required NADPH as a coenzyme.; GO: 0008883 glutamyl-tRNA reductase activity, 0050661 NADP binding, 0033014 tetrapyrrole biosynthetic process.

Probab=93.63  E-value=0.29  Score=27.80  Aligned_cols=67  Identities=19%  Similarity=0.305  Sum_probs=37.7

Q ss_pred             HCCCEEEEECCCHHHHHHHHHHHHCC-CEEEEEECCCHHHH-HHHHCCC-EEECCCC-------CCCCCCCEEEECC
Q ss_conf             18987999836854899999999859-86999818964788-9997898-9964531-------5722588899888
Q gi|254781099|r    6 FRNHSIAVFGLGRSGLSAACALKDSG-VHVIAWDDHPCAVK-QAKDMGI-EVIDFRE-------IPWSIISFLVLSP   72 (468)
Q Consensus         6 ~~~k~v~i~G~G~sG~s~A~~l~~~G-~~V~~~D~~~~~~~-~l~~~g~-~~~~~~~-------~~~~~~d~vv~Sp   72 (468)
T Consensus       183 L~~~~~LliGAGeMg~Lva~~L~~~~v~~~~i~NRt~~rA~~LA~e~~~P~~~~f~~La~~~L~~~L~~~DivissT  259 (436)
T TIGR01035       183 LKGKKVLLIGAGEMGELVAKHLREKGVGKVLIANRTYERAEKLAKELGGPEAVKFEALALEKLEEALAEADIVISST  259 (436)
T ss_pred             CCCCEEEEEECCHHHHHHHHHHHHCCCCEEEEECCCHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHCCEEEEEC
T ss_conf             16641899827457999999996489528988556778999999870786645444554899999974288999855