Penicillium purpurogenum produces a novel endo-1,5-arabinanase, active on debranched arabinan, short arabinooligosaccharides and on the artificial substrate p-nitrophenyl arabinofuranoside

Active site model comparison between: A) Enzyme with high activity on p-nitrophenyl arabinofuranoside (pNPAra); B) Enzyme with low activity on pNPAra; C) Enzyme with no activity on pNPAra. Underlined are the catalytic residues.272