panB Ketopantoate hydroxymethyltransferase 3-methyl-2-oxobutanoate hydroxymethyltransferase Reut_A2780 PANB_CUPPJ MSYLLDPSRKTVTITRLQAMRDAGEKIAMLTAYDSSFAALLDYCGVEVILVGDSLGNVMQGQQTTLPVTLEHMAYHTECVARANQTALLVTDLPFGTYGTPEMAFASAVTLMRAGAHMVKLEGGDWLAPTVKFLVERSIPVCAHIGLTPQSVHAFGGFKVQGKTDEGAAQLRRDAQAMEAAGAQIVLMEAVPATLAGEITQMLKVPTIGIGAGADCSGQVLVLQDMINVYPGRKAKFVRNFMDGQTTIEGAIRAYVAAVKDGSFPAAEHTFSA 273 Catalyzes the reversible reaction in which hydroxymethyl group from 5,10-methylenetetrahydrofolate is tranferred onto alpha-ketoisovalerate to form ketopantoate (By similarity).