Hong-Min Zhou's scientific contributionswhile working at Anhui University (Hefei, China) and other institutions

Publications (3)

Publications citing this author (55)

    • Summaries of heterologously expressed laccases can be found in recent publications (Kittl et al., 2012;Mate and Alcalde, 2015; AntošovˇaAntošovˇa and Sychrová, 2016;Ergün and Çalık, 2016). Occasionally, high recombinant laccase activity is obtained (Hong et al., 2002Hong et al., , 2007Nishibori et al., 2013), but many recombinant laccases are expressed at levels below 10 U/mL, which can be even lower than that in the native strain (Yang et al., 2016b). An appropriate host is needed for heterologous expression of laccases, but " the best host " remains elusive (Piscitelli et al., 2010;Rivera-Hoyos et al., 2013).
    [Show abstract] [Hide abstract] ABSTRACT: Laccases are a family of copper-containing oxidases with important applications in bioremediation and other various industrial and biotechnological areas. There have been over two dozen reviews on laccases since 2010 covering various aspects of this group of versatile enzymes, from their occurrence, biochemical properties, and expression to immobilization and applications. This review is not intended to be all-encompassing; instead, we highlighted some of the latest developments in basic and applied laccase research with an emphasis on laccase-mediated bioremediation of pharmaceuticals, especially antibiotics. Pharmaceuticals are a broad class of emerging organic contaminants that are recalcitrant and prevalent. The recent surge in the relevant literature justifies a short review on the topic. Since low laccase yields in natural and genetically modified hosts constitute a bottleneck to industrial-scale applications, we also accentuated a genus of laccase-producing white-rot fungi, Cerrena, and included a discussion with regards to regulation of laccase expression.
    Full-text · Article · May 2017
    • However, as shown inTable 1, the expression of various laccases in yeasts turned out to be relatively difficult with yields usually far below 50 mg L −1 thus hampering detailed studies on structure and applications of these biotechnologically attractive enzymes or complicate attempts to engineer laccases. So far, only sophisticated high cell density fermentations were able to boost recombinant laccase production above 100 mg L −1 (Zhou et al., 2007). The use of fungal expression systems gives good yields (200–1000 mg L −1 (Andberg et al., 2009; Baker and White, 2001)), but genetic manipulation is difficult.
    [Show abstract] [Hide abstract] ABSTRACT: Fungal laccases from basidiomycetous fungi are thoroughly investigated in respect of catalytic mechanism and industrial applications, but the number of reported and well characterized ascomycetous laccases is much smaller although they exhibit interesting catalytic properties. We report on a highly chloride tolerant laccase produced by the plant pathogen ascomycete Botrytis aclada, which was recombinantly expressed in Pichia pastoris with an extremely high yield and purified to homogeneity. In a fed-batch fermentation, 495 mg L(-1) of laccase was measured in the medium, which is the highest concentration obtained for a laccase by a yeast expression system. The recombinant B. aclada laccase has a typical molecular mass of 61,565 Da for the amino acid chain. The pI is approximately 2.4, a very low value for a laccase. Glycosyl residues attached to the recombinant protein make up for approximately 27% of the total protein mass. B. aclada laccase exhibits very low K(M) values and high substrate turnover numbers for phenolic and non-phenolic substrates at acidic and near neutral pH. The enzyme's stability increases in the presence of chloride ions and, even more important, its substrate turnover is only weakly inhibited by chloride ions (I(50)=1.4M), which is in sharp contrast to most other described laccases. This high chloride tolerance is mandatory for some applications such as implantable biofuel cells and laccase catalyzed reactions, which suffer from the presence of chloride ions. The high expression yield permits fast and easy production for further basic and applied research.
    Full-text · Article · Dec 2011