AA9 family lytic polysaccharide monooxygenase A

UniProtKB accession:  A0A0S2GKZ1

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UniProtKB description:  Lytic polysaccharide monooxygenase (LPMO) that depolymerizes crystalline and amorphous polysaccharides via the oxidation of scissile alpha- or beta-(1-4)-glycosidic bonds, yielding C1 or C4 oxidation product (PubMed:26928935, PubMed:29057953, PubMed:32818374). Catalysis by LPMOs requires the reduction of the active-site copper from Cu(II) to Cu(I) by a reducing agent and H(2)O(2) or O(2) as a cosubstrate (PubMed:26928935, PubMed:29057953). Is able to cleave phosphoric acid swollen cellulose (PASC) in the presence of a reducing agent, yielding a range of cellooligosaccharides dominated by cellobiose and cellotriose (PubMed:26928935). Activity is less sensitive to the reducing agent potential when cleaving xylan, suggesting that distinct catalytic mechanisms exist for xylan and glucan cleavage (PubMed:29057953).