>TIGR00655 PurU formyltetrahydrofolate deformylase; InterPro: IPR004810 An Escherichia coli gene designated purU has been identified and characterised. The gene codes for a 280-amino-acid protein, PurU (P37051 from SWISSPROT, 3.5.1.10 from EC). PurU is an enzyme that catalyses the hydrolysis of 10-formyltetrahydrofolate (formyl-FH4) to FH4 and formate ,. 10-formyltetrahydrofolate + H(2)O = formate +tetrahydrofolate Formyl-FH4 hydrolase generates the formate that is used by purT-encoded 5'-phosphoribosylglycinamide transformylase for step three of de novo purine nucleotide synthesis. Formyl-FH4 hydrolase, a hexamer of 32kDa subunits, is activated by methionine and inhibited by glycine. Heterotropic cooperativity is observed for activation by methionine in the presence of glycine and for inhibition by glycine in the presence of methionine. These results suggest that formyl-FH4 hydrolase is a regulatory enzyme whose main function is to balance the pools of FH4 and C1-FH4 in response to changing growth conditions. The enzyme uses methionine and glycine to sense the pools of C1-FH4 and FH4, respectively. ; GO: 0008864 formyltetrahydrofolate deformylase activity, 0006189 'de novo' IMP biosynthetic process.

Probab=99.83 E-value=7.6e-21 Score=152.36 Aligned_cols=166 Identities=22% Similarity=0.273 Sum_probs=138.4 Q ss_pred EEEEECCCHHHHHHHHHHHH---CC---CCEEEEEECCCCCCCCCCCCCCCCHHHHHHHHCCCCEEEECCCCC------- Q ss_conf 69997798688999999996---79---849999827578227578756789889999985997997024344------- Q gi|255764462|r 4 RVVFMGTSEFAVATLQALVS---SS---HSIVSVYTQPPRPAGRRGLKSVLSAVHKKAQEFSLPALVPTKLGQ------- 70 (310) Q Consensus 4 kI~f~G~~~~~~~~l~~l~~---~~---~~i~~vvt~~d~~~~~~~~~~~~~~v~~~a~~~~ip~~~~~~~~~------- 70 (310) T Consensus 94 rvai~vsKe~--HCL~DLL~r~~~GeL~~ei~~VIsNH~~-------------lr~lve~F~iPF~~~p~~~~~r~e~Ek 158 (294) T TIGR00655 94 RVAILVSKED--HCLGDLLWRWYSGELDAEIALVISNHED-------------LRELVERFGIPFHYIPATKDTRLEHEK 158 (294) T ss_pred EEEEEEECCH--HHHHHHHHHHCCCCCEEEEEEEECCCHH-------------HHHHHHHCCCCEEEECCCCCHHHHHHH T ss_conf 6899840412--0358999987389823799998649878-------------998866538988986378850568999 Q ss_pred CCHHHHHHC------CCCCEEEECCCCCCCCCCCCCCCCCHHHHCCCCCCCHHHHHHHHHHHHCCCCCCCCCEEEECCCC Q ss_conf 200234210------45731320242112443001211001010232221033200244443103454543202201233 Q gi|255764462|r 71 EEYEQFLSF------NADVAVVVAYGLVIPQRILNATKLGFYNGHASLLPRWRGAAPIQRAIMAGDNETGIAIMKMDKHL 144 (310) Q Consensus 71 ~~~~~l~~~------~~D~~v~~~~~~ii~~~il~~~~~g~iN~H~s~LP~yRG~~pi~wai~~g~~~~g~t~~~~~~~~ 144 (310) T Consensus 159 ~~Lell~~yelkh~~~~DlvVLAkYMqIL~p~Fv~~~pN~iINIHHSFLPAFiGA~PY~rA~eRGVKiIGATAHYVt~~L 238 (294) T TIGR00655 159 KELELLKQYELKHKYQVDLVVLAKYMQILSPDFVKRYPNKIINIHHSFLPAFIGANPYQRAYERGVKIIGATAHYVTEEL 238 (294) T ss_pred HHHHHHHCCCCCEECCCCEEEEEHHCCCCCHHHHHHCCCCEEECCCCCCCCCCCCCCHHHHHCCCCEEEECCEEEECCCC T ss_conf 99998740332110275469821010217835774457931211235245544676237887088337702001003357 Q ss_pred CHHHHHHHCCCCCCCCCCHHHHHHCCCCCCHHHHHHHCCH Q ss_conf 2034542014543332210110000023301122320000 Q gi|255764462|r 145 DTGPVAFMRKVPISSNINTAGLQQELSVLCAHAMVEAMDK 184 (310) Q Consensus 145 D~G~Ii~q~~~~I~~~~t~~~L~~kl~~~~~~ll~~~l~~ 184 (310) T Consensus 239 DeGPIIeQDv~rVdH~~~~e~l~r~GrDiEk~VLaRAv~~ 278 (294) T TIGR00655 239 DEGPIIEQDVVRVDHTDNVEDLIRAGRDIEKVVLARAVKL 278 (294) T ss_pred CCCCCEEECCEEECCCCCHHHHHHCCCCHHHHHHHHHHHH T ss_conf 8889025330452766777899860675126789999999

HHsearch alignment for GI: 255764462 and conserved domain: TIGR00655