Identification and functional study of AA11 family polysaccharide monooxygenase genes in filamentous fungus Podospora anserina
Received date: 2023-08-21
Revised date: 2023-10-28
Online published: 2023-11-10
Supported by
National Key R&D Program of China(2021YFA0910800);Basic and Applied Basic Research Fund of Guangdong Province(2021A1515012166);Basic and Applied Basic Research Fund of Guangdong Province(2021A1515012118);National Natural Science Foundation of China(31601014);National Natural Science Foundation of China(22078199)
The lytic polysaccharide monooxygenase (LPMO) in the auxiliary active protein family (AA family) catalyzes the oxidative depolymerization of various refractory carbohydrates including cellulose, chitin and starch. While accumulating studies investigate the enzymology of LPMO, the research on the inactivation of LPMO genes has been rarely explored. In this study, five LPMO genes PaLPMO11A (Pa_4_4790), PaLPMO11B (Pa_1_5310), PaLPMO11C (Pa_2_7840), PaLPMO11D (Pa_2_8610) and PaLPMO11E (Pa_3_9420) of the AA11 family in the filamentous fungus Podospora anserina were knocked out by homologous recombination. Single mutants ΔPaLPMO11A (ΔA), ΔPaLPMO11B (ΔB), ΔPaLPMO11C (ΔC), ΔPaLPMO11D (ΔD) and ΔPaLPMO11E (ΔE) were constructed, and then all polygenic mutants were constructed via genetic crosses. The differences in the growth rate and sexual reproduction between wild type and mutant strains were observed on different carbon source media. The alteration of oxidative stress and cellulose degradation ability were found on DAB and NBT staining and cellulase activity determination. These results implicated that LPMO11 genes play a key role in the growth, development, and lignocellulose degradation of P. anserina. The results showed that the spore germination efficiency, growth rate and reproductive capacity of mutant strains including ΔBΔCΔE, ΔAΔBΔCΔE, ΔAΔCΔDΔE and ΔAΔBΔCΔDΔE was significantly decreased on different cellulose carbon sources and the remaining strains have no difference. The reduced utilization of various carbon sources, the growth rate, the spore germination rate, the number of fruiting bodies, the normal fruiting bodies, the shortened life span and the ability to degrade cellulose were found in strains which all five genes in the PaLPMO11 family were deleted. However, the strain still had 45% cellulase activity compared to wild type. These results suggest that LPMO11 genes may be involved in the growth and development, sexual reproduction, senescence and cellulose degradation of P. anserina. This study provides information for systematically elucidating the regulatory mechanism of lignocellulose degradation in filamentous fungus P. anserina.
Wenzhen Du, Yuanjing Li, Jialing Wu, Siyu Chen, Liang Jiang, Gang Liu, Ning Xie . Identification and functional study of AA11 family polysaccharide monooxygenase genes in filamentous fungus Podospora anserina[J]. Hereditas(Beijing), 2023 , 45(12) : 1128 -1146 . DOI: 10.16288/j.yczz.23-223
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