Relevância de compostos de baixa massa molar produzidos por fungos e envolvidos na biodegradação da madeira

Arantes, Valdeir; Milagres, Adriane M. F.

doi:10.1590/s0100-40422009000600043

Cited by 27 publications

(16 citation statements)

References 100 publications

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“…Despite this, 40% of the isolates were able to transform Azure B from blue to pink. These same isolates showed a strong reaction over the syringaldazine, suggesting that laccase might be involved in the transformation of Azure B (Arantes and Milagres 2009). In a previous study (Sin et al 2002), a pair of strains (Periconia sp.…”

Section: Plate Screening For Degrading Enzymes Of Plant Cell Wall Commentioning

confidence: 80%

Native Macrofungi that Produce Lignin-Modifying Enzymes, Cellulases, and Xylanases with Potential Biotechnological Applications

et al. 2015

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With the aim of identifying and exploiting the mycological resources available in the Mexican Sierra Madre Oriental, the lignocellulolytic and pectinolytic potential of autochthonous fungi were evaluated in the present work. A solid media selection system was established in which 74 isolated strains were tested and compared to six international reference strains. The macrofungi Xylaria sp CS121, Inonotus sp CU7, Basidiomycete CH32, Basidiomycete CH23, Xylaria poitei, and Trametes maxima CU1 showed the highest cellulolytic and pectinolytic potential. The greatest lignolytic capability was exhibited by T. maxima CU1 and Pycnoporus sanguineus CS43. Under stirred submerged culture, T. maxima CU1 (cellulases, cellobiose dehydrogenase, manganese peroxidase (MnP), and laccase, with 200, 359, 51, and 267 U/L, respectively) and Xylaria sp CS121 (198 U/L of xylanases) were the highest enzymatic producers. Under stationary conditions, the best producers were Inonotus sp CU7 for cellulases, P. sanguineus CS43 for cellobiose dehydrogenase and laccase, and T. maxima CU1 for xylanases and MnP (242, 467, 35, 165, and 31 U/L, respectively). These results demonstrate the efficiency of enzymatic profiling as a tool for enzyme discovery with Mexican native fungi.

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Section: Plate Screening For Degrading Enzymes Of Plant Cell Wall Commentioning

confidence: 80%

Native Macrofungi that Produce Lignin-Modifying Enzymes, Cellulases, and Xylanases with Potential Biotechnological Applications

et al. 2015

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“…The aforementioned findings coupled with more recent evidence (reviewed elsewhere- Arantes and Milagres 2009) show that plant cell wall deconstructing enzymes are too large to penetrate into the intact nonmodified wood cell wall. Earlier works (Blanchette et al 1997;Flournoy et al 1991) supported the hypothesis of the involvement of smaller agents in the initiation of brown-rot decay.…”

Section: Fenton Chemistrymentioning

confidence: 91%

Peculiarities of brown-rot fungi and biochemical Fenton reaction with regard to their potential as a model for bioprocessing biomass

Arantes

Jellison

Goodell

2012

Appl Microbiol Biotechnol

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287

214

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This work reviews the brown-rot fungal biochemical mechanism involved in the biodegradation of lignified plant cell walls. This mechanism has been acquired as an apparent alternative to the energetically expensive apparatus of lignocellulose breakdown employed by white-rot fungi. The mechanism relies, at least in the incipient stage of decay, on the oxidative cleavage of glycosidic bonds in cellulose and hemicellulose and the oxidative modification and arrangement of lignin upon attack by highly destructive oxygen reactive species such as the hydroxyl radical generated non-enzymatically via Fenton chemistry [Formula: see text]. Modifications in the lignocellulose macrocomponents associated with this non-enzymatic attack are believed to aid in the selective, near-complete removal of polysaccharides by an incomplete cellulase suite and without causing substantial lignin removal. Utilization of this process could provide the key to making the production of biofuel and renewable chemicals from lignocellulose biomass more cost-effective and energy efficient. This review highlights the unique features of the brown-rot fungal non-enzymatic, mediated Fenton reaction mechanism, the modifications to the major plant cell wall macrocomponents, and the implications and opportunities for biomass processing for biofuels and chemicals.

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“…Low molecular weight peptides or phenolate-type compounds produced by 'brown rot' wood-decaying fungi (mainly Basidiomycota) are thought to mediate the non-hydrolytic/nonenzymatic attack of the lignocellulose matrix [71-73]. This attack is thought to increase pore size, consequently enhancing the diffusion of cellulases within the substrate [71-78].…”

Section: Other Non-hydrolytic Proteinsmentioning

confidence: 99%

Access to cellulose limits the efficiency of enzymatic hydrolysis: the role of amorphogenesis

Arantes

Saddler

2010

Biotechnol Biofuels

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503

340

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The efficient enzymatic saccharification of cellulose at low cellulase (protein) loadings continues to be a challenge for commercialization of a process for bioconversion of lignocellulose to ethanol. Currently, effective pretreatment followed by high enzyme loading is needed to overcome several substrate and enzyme factors that limit rapid and complete hydrolysis of the cellulosic fraction of biomass substrates. One of the major barriers faced by cellulase enzymes is their limited access to much of the cellulose that is buried within the highly ordered and tightly packed fibrillar architecture of the cellulose microfibrils. Rather than a sequential 'shaving' or 'planing' of the cellulose fibrils from the outside, it has been suggested that these inaccessible regions are disrupted or loosened by non-hydrolytic proteins, thereby increasing the cellulose surface area and making it more accessible to the cellulase enzyme complex. This initial stage in enzymatic saccharification of cellulose has been termed amorphogenesis. In this review, we describe the various amorphogenesis-inducing agents that have been suggested, and their possible role in enhancing the enzymatic hydrolysis of cellulose.

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Relevância de compostos de baixa massa molar produzidos por fungos e envolvidos na biodegradação da madeira

Cited by 27 publications

References 100 publications

Native Macrofungi that Produce Lignin-Modifying Enzymes, Cellulases, and Xylanases with Potential Biotechnological Applications

Native Macrofungi that Produce Lignin-Modifying Enzymes, Cellulases, and Xylanases with Potential Biotechnological Applications

Peculiarities of brown-rot fungi and biochemical Fenton reaction with regard to their potential as a model for bioprocessing biomass

Access to cellulose limits the efficiency of enzymatic hydrolysis: the role of amorphogenesis

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