An efficient method for isolation of auxotrophs of Penicillium chyrysogenum involving mutagenesis with ethyl methanesulfonate followed by enrichment with sodium pentachlorophenate was developed. The auxotroph frequencies obtained were 30 to 40%.
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http://dx.doi.org/10.1128/am.24.6.995-996.1972 | DOI Listing |
Biotechnol Lett
June 2023
National Key Laboratory of Enzyme and Protein Technology, University of Science, Vietnam National University, Hanoi (VNU), 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam.
Objectives: This work aimed to construct a versatile, effective, and food-grade Agrobacterium tumefaciens-mediated transformation (ATMT) system for recombinant expression in the filamentous fungus Penicillium rubens (also known as Pencillium chrysogenum).
Results: In this study, the wild-type P. chrysogenum VTCC 31172 strain was re-classified as P.
Biochim Biophys Acta Proteins Proteom
January 2020
Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky Pr. 33/2, Moscow 119071, Russia; Department of Chemistry, M. V. Lomonosov Moscow State University, Vorobyovy Gory 1/11, Moscow 119991, Russia.
Two forms of C1/C4-oxidizing lytic polysaccharide monooxygenase (PvLPMO9A) from Penicillium verruculosum (Talaromyces verruculosus) homologously expressed in P. verruculosum B1-537 auxotrophic strain were isolated in a homogeneous state using two-stage chromatography. The PvLPMO9A-hm form represented a full-size enzyme encoded by the intact lpmo1 gene, while the PvLPMO9A-lm was a truncated enzyme variant consisting of a conserved catalytic core of AA9 family LPMOs and lacking a C-terminal extra peptide sequence that is present in PvLPMO9A-hm.
View Article and Find Full Text PDFMol Biol Rep
April 2019
Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky Pr. 33/2, Moscow, 119071, Russia.
The gene lpmo1 encoding Penicillium verruculosum lytic polysaccharide monooxygenase (PvLPMO9A) was sequenced and homologously overexpressed in P. verruculosum B1-537 (ΔniaD) auxotrophic strain under the control of the cbh1 gene promoter in combination with either the cbh1 signal sequence (sCBH1-X series of samples) or the native lpmo1 signal sequence (sLPMO1-X series). Three enzyme samples of the sCBH1-X series were characterized by a lower overall content of cellobiohydrolases (CBHs: 26-45%) but slightly higher content of endoglucanases (EGs: 17-23%) relative to the reference B1-537 preparation (60% of CBHs and 14% of EGs), while the PvLPMO9A content in them made up 9-21% of the total secreted protein.
View Article and Find Full Text PDFFront Microbiol
July 2018
Departamento de Protección Vegetal, Subdirección General de Investigación y Tecnología (SGIT), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain.
Strain 212 of (PO212) is an effective fungal biological control agent against a broad spectrum of diseases of horticultural plants. A pyrimidine auxotrophic isolate of PO212, PO21218.2, carrying an inactive gene, has been used as host for transformation by positive selection of vectors containing the gene complementing the mutation.
View Article and Find Full Text PDFInt J Biol Macromol
November 2017
Federal State Institution "Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences", Leninsky Pr. 33, Moscow 119071, Russia; Department of Chemistry, M.V. Lomonosov Moscow State University, Vorobyovy Gory 1/11, Moscow 119991, Russia.
In order to investigate factors affecting the thermostability of GH10 xylanase A from Penicillium canescens (PcXylA) and to obtain its more stable variant, the wild-type (wt) enzyme and its mutant forms, carrying single amino acid substitutions, were cloned and expressed in Penicillium verruculosum B1-537 (niaD-) auxotrophic strain under the control of the cbh1 gene promoter. The recombinant PcXylA-wt and I6V, I6L, L18F, N77D, Y125R, H191R, S246P, A293P mutants were successfully expressed and purified for characterization. The mutations did not affect the enzyme specific activity against xylan from wheat as well as its pH-optimum of activity.
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