>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=96.60  E-value=0.025  Score=35.07  Aligned_cols=109  Identities=13%  Similarity=0.196  Sum_probs=65.8

Q ss_pred             HCCCCEEEEECCCCCCHHHHHHHHHHHHCC-CEEEEEECCHHHHHHHHHHHHCCCCEEEEECCCCCHHHHHHHHHHHHHH
Q ss_conf             229978999488988417999999999889-8899984898899999999713892899988899999999999999998
Q gi|254781166|r    7 LMKDKRGIVLGVANNRSLAWSIAKMCHAAG-AKVALTWQGDATKKRIEGLVEGMDFFMAGHCNVSNSETIDDVFRNLEKE   85 (284)
Q Consensus         7 ~L~~K~~iVtGa~g~~GIG~aiA~~la~~G-a~Vvi~~~~~~~~~~~~~~~~~~~~~~~~~~Dv~~~~~v~~~~~~~~~~   85 (284)
T Consensus       182 rL~~~~~LliGAGe---Mg~Lva~~L~~~~v~~~~i~NRt~~rA~~LA~e~~~P~---~~~f~~L---a~~~L~~~L---  249 (436)
T TIGR01035       182 RLKGKKVLLIGAGE---MGELVAKHLREKGVGKVLIANRTYERAEKLAKELGGPE---AVKFEAL---ALEKLEEAL---  249 (436)
T ss_pred             CCCCCEEEEEECCH---HHHHHHHHHHHCCCCEEEEECCCHHHHHHHHHHCCCCC---CCCCCHH---HHHHHHHHH---
T ss_conf             11664189982745---79999999964895289885567789999998707866---4544455---489999997---


Q ss_pred             HCCCCEEEECCCCCCCCCCCCCCCCCCHHHHHHHHCCC----CCHHHHHHHHHHH
Q ss_conf             47988999627212742125862135899985564026----4023223467887
Q gi|254781166|r   86 WGTIDFLVHAIAFSDKAELTGPYINTTRENFLNTMDVS----VYSFTALAARASS  136 (284)
Q Consensus        86 ~G~iD~lInnag~~~~~~~~~~~~~~~~e~~~~~~~vn----l~~~~~~~k~~~~  136 (284)
T Consensus       250 -~~~DivissTgA~~pi--------~~~~~~e~a~~~Rr~de~~~pl~~~DIAvP  295 (436)
T TIGR01035       250 -AEADIVISSTGAPEPI--------VSKEDVERALKERRRDEAARPLFIVDIAVP  295 (436)
T ss_pred             -HHCCEEEEECCCCCCC--------CCCHHHHHHHHHHCCCCCCCCEEEEECCCC
T ss_conf             -4288999855765310--------020348999997222001588699975889