>TIGR00557 pdxA 4-hydroxythreonine-4-phosphate dehydrogenase; InterPro: IPR005255 Pyridoxal phosphate is the active form of vitamin B6 (pyridoxine or pyridoxal). PLP is a versatile catalyst, acting as a coenzyme in a multitude of reactions, including decarboxylation, deamination and transamination , , . PLP-dependent enzymes are primarily involved in the biosynthesis of amino acids and amino acid-derived metabolites, but they are also found in the biosynthetic pathways of amino sugars and in the synthesis or catabolism of neurotransmitters; pyridoxal phosphate can also inhibit DNA polymerases and several steroid receptors . Inadequate levels of pyridoxal phosphate in the brain can cause neurological dysfunction, particularly epilepsy . PLP enzymes exist in their resting state as a Schiff base, the aldehyde group of PLP forming a linkage with the epsilon-amino group of an active site lysine residue on the enzyme. The alpha-amino group of the substrate displaces the lysine epsilon-amino group, in the process forming a new aldimine with the substrate. This aldimine is the common central intermediate for all PLP-catalyzed reactions, enzymatic and non-enzymatic . In Escherichia coli, the pdx genes involved in vitamin B6 have been characterised , , . This entry represents 4-hydroxythreonine-4-phosphate dehydrogenase (PdxA, 1.1.1.262 from EC). PdxA takes part in vitamin B6 biosynthesis, forming pyridoxine 5'-phosphate from 4-(phosphohydroxy)-L-threonine and 1-deoxy-D-xylulose-5-phosphate.; GO: 0050570 4-hydroxythreonine-4-phosphate dehydrogenase activity, 0051287 NAD binding, 0008615 pyridoxine biosynthetic process.

Probab=100.00 E-value=0 Score=770.29 Aligned_cols=320 Identities=36% Similarity=0.600 Sum_probs=304.4 Q ss_pred CCEEEECCCCCCCCHHHHHHHHCCCCHHCCCCEEEECCHHHHHHHHHHCCCCCCEEECCCCHHCCCCCCCE-EEECCCCC Q ss_conf 83899718987747899999842852324898999939999999999818997447538610111267853-76103332 Q gi|254780397|r 5 LPLILTQGDPAGIGPDISLKAWASRQITAIPPFIYIGDVDVLNARAKQLNLSVPLYETDCKNAVSIFKKAL-PIISSPCG 83 (343) Q Consensus 5 ~pI~IT~GDPaGIGpEIilKal~~~~~~~~~~~viigd~~~l~~~~k~l~~~~~i~~i~~~~~~~~~~~~i-~i~~~~~~ 83 (343) T Consensus 2 kki~It~GdpaGiGpeLilk~~--k~~~~~~e~v~~~d~~lL~~a~~llg~~l~~k~~~~~~~A~~~tag~~~~~p~~L~ 79 (325) T TIGR00557 2 KKIAITLGDPAGIGPELILKLA--KRVEEKVELVVLADEKLLEEAAKLLGLKLELKKLEKVEEAKERTAGVLLLAPVALK 79 (325) T ss_pred CEEEEECCCCCCCCHHHHHHHH--HHHHHCCCEEEECCHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHH T ss_conf 5478616875561688999987--77510331588656789999998617721032158775310456777876434430 Q ss_pred CCCCCCCCCCCCCHHHHHHHHHHHHHHHCCCCCEEEECHHHHHHHHHHCCCCCCHHHHHHHHHCCCCCCCCCCCCCCCCC Q ss_conf 20013553100000246778877664301234304432234477764101325647899998342358866521123322 Q gi|254780397|r 84 AKIVTGTPNPQTASSTIANIEKAVSLTLSGQALAIVTNPIAKFLLYQEKFKFPGHTEFLAELAKKNTGITFKPVMMLSGP 163 (343) Q Consensus 84 ~~~~~G~~s~~~g~~~~~sl~~A~~l~~~g~~~alVT~PInK~~l~~aG~~f~GhTE~La~~~~~~~~~~~~~~Mll~~~ 163 (343) T Consensus 80 ~pvt~g~vs~~sG~y~ve~larAc~~a~~ge~~gi~T~PinK~~~~~Agipf~GhTeFl~~rs~~k-----~~~MMl~~e 154 (325) T TIGR00557 80 APVTAGKVSVESGKYAVESLARACEDALSGEVDGILTLPINKLVIKKAGIPFVGHTEFLKKRSKAK-----KVVMMLASE 154 (325) T ss_pred CCCCCCCHHHHCCHHHHHHHHHHHHHHHCCCCCEEEECCHHHHHHHCCCCCCCCCHHHHHHHHCCC-----CEEEEECCC T ss_conf 544466100101268999999998764125711565065115788606897443508999852486-----278761154 Q ss_pred CCEEEEECCCCCHHHHHHHCCHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCCCCCCCCCCCCCHHHHHHHHHHH-- Q ss_conf 112665304531333432010245678889899999853134567079996366544531000012102445888642-- Q gi|254780397|r 164 QLRTVPVTIHIPIADICRILSTKRIIETSDTVYNAMKKYFGINNPRIAISGLNPHAGENATIGIEEKNIIIPAITYLR-- 241 (343) Q Consensus 164 ~L~V~l~TtHiPLk~V~~~it~~~I~~ki~~~~~~l~~~~gi~~PkIaV~gLNPHAGE~G~~G~EE~~iI~PaI~~~~-- 241 (343) T Consensus 155 kL~V~L~ttH~PL~dv~~~i~~~~l~k~~~~~~k~~~~KfG~~EP~i~VcGlNPHAGE~G~~G~EEie~Iipa~~e~~qt 234 (325) T TIGR00557 155 KLKVALLTTHVPLKDVADLIKKEALLKVVLLLRKELREKFGKAEPLIKVCGLNPHAGEEGELGREEIEEIIPAVEEAKQT 234 (325) T ss_pred CCEEEEEECCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCEEEECCCCCCCCCCCCCCHHHHHHHHHHHHHHHH T ss_conf 20245421577756576440388999999999898886532117714773368877888998851356789999986544 Q ss_pred HCCCCCCCCCCCHHHEECCCCCCCCEEEEEECCHHHHHHHHHCCCCEEEEEEECCEEEECCCCCCCHHHCCCCCCCHHHH Q ss_conf 15876434555112100022366768999851202255554144772799920876475588755222133686683899 Q gi|254780397|r 242 NDNKNIIGPLPADSMFHHSARQCYDVAICMYHDQALIPIKTLDFNQTVNITLGLPFVRTSPDHGTAFDIAGSSLTQEESL 321 (343) Q Consensus 242 ~~g~~v~GP~paDt~F~~~~~~~~D~vlamYHDQglip~K~l~f~~~Vn~t~GLp~irtSpdHGTafdiagk~~a~~~s~ 321 (343) T Consensus 235 ~~g~k~~GPLpaD~aF~p~~~~~~d~~l~MyHD~GL~plK~l~FdegvN~tLglPfiRTS~DHGTA~diA~~nKA~~~S~ 314 (325) T TIGR00557 235 KEGIKLVGPLPADSAFAPKKREIADVYLAMYHDQGLAPLKALAFDEGVNVTLGLPFIRTSVDHGTAFDIAYKNKADEKSY 314 (325) T ss_pred CCCEEEECCCCCCCCCCCCCCCCCCEEEEEECCCCCHHHHHHHCCCCEEEEECCCHHCCCCCCHHHHHHHCCCCCCCCHH T ss_conf 08456437888441347875457866898325666067776434771466408761013786104788620134563008 Q ss_pred HHHHHHHHHH Q ss_conf 9999999999 Q gi|254780397|r 322 VSALKIAAQL 331 (343) Q Consensus 322 ~~ai~~a~~~ 331 (343) T Consensus 315 l~Al~l~~~l 324 (325) T TIGR00557 315 LNALKLLADL 324 (325) T ss_pred HHHHHHHHHH T ss_conf 9999999983

HHsearch alignment for GI: 254780397 and conserved domain: TIGR00557