Function
Alpha-galacturonidase able to catalyze the hydrolysis of the chromogenic substrate p-nitrophenyl-alpha-D-galacturonic acid (pNPalphaGalUA), and of the probable natural substrate alpha-1,4-di-galacturonate (GalUA(2)). Can neither hydrolyze pNPbetaGalUA, nor the stereoisomeric pNPalphaGlcUA. Does not display alpha- or beta-glucosidase activity as it fails to hydrolyze melibiose, raffinose, lactose and the chromogenic analogs, pNPalphaGal and pNPbetaGal. Cannot use the following compounds as substrates: pNP-N-acetyl-alpha- and beta-D-galactosaminide, pNP-N-acetyl-alpha- and beta-D-glucosaminide, pNP-alpha-L- and beta-L-arabinopyranoside, pNP-alpha- and beta-D-glucuronide, pNP-alpha- and beta-D-glucopyranoside, pNP-alpha- and beta-D-glucopyranoside 6-phosphate, pNP-alpha-D-galactopyranoside 6-phosphate and oNP-beta-D-galactopyranoside 6-phosphate.
Sequence
MFHISTLDQIKIAYIGGGSQGWARSLMSDLSIDERMSGTVALYDLDFEAAQKNEVIGNHSGNGRWRYEAVSTLKKALSAADIVIISILPGSLDDMEVDVHLPERCGIYQSVGDTVGPGGIIRGLRAVPIFAEIARAIRDYAPESWVINYTNPMSVCTRVLYKVFPGIKAIGCCHEVFGTQKLLAEMVTERLGIEVPRREDIRVNVLGINHFTWITKASYRHIDLLPIFREFSAHYGESGYELEGECWRDSVFCSAHRVAFDLFETYGAIPAAGDRHLAEFLPGPYLKQPEVWKFHLTPISFRKQDRAEKRQETERLIVQQRGVAEKASGEEGVNIIAALLGLGELVTNVNMPNQGQVLNLPIQAIVETNAFITRNRVQPILSGALPKGVEMLAARHISNQEAVADAGLTKDTGLAFQAFLNDPLVQIDRSDAEQLFNDMLQCIMQS