>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=97.26  E-value=0.00058  Score=41.75  Aligned_cols=63  Identities=13%  Similarity=0.116  Sum_probs=50.3

Q ss_pred             EEEEEECCCCCHHHHHHHHHHHCCCCEEEEEEE-CCCCCCEEEEEEEECCCCC-----------HHHHHHHHC-CC
Q ss_conf             999998287866889998997369963227742-1478981899999478899-----------899999864-98
Q 537021.9.peg.3   25 MICIVNADILGIVVFVGNILGEYGINIAHFHLG-RSQSTEHAISFLCIDGSIL-----------NSVLEKLSV-NV   87 (100)
Q Consensus        25 ~L~i~~~D~PG~I~~v~~~L~~~~INIa~m~l~-r~~~g~~A~~ii~vD~~i~-----------~~vl~~i~~-~~   87 (100)
T Consensus         2 ~Ll~~CpD~kGlva~is~f~~~~g~NIi~~dq~~~D~~~g~Ff~R~e~~~~~~~~nteikeq~~~~L~~~~~~ala   77 (294)
T TIGR00655         2 ILLVSCPDQKGLVAAISTFIAKHGANIISNDQFSVDPETGRFFMRVELQLEGFRLNTEIKEQEESELLAAFKSALA   77 (294)
T ss_pred             EEEEECCCCCCHHHHHHHHHHHCCCCEEECCCEEECCCCCCEEEEEEEECCCCCCCCHHHCCCHHHHHHHHHHHHH
T ss_conf             0123159788728999999997489867417564415777131234440368731200001405899999986434