Progress in Microbial Degradation of Feather Waste

Li, Qingxin

doi:10.3389/fmicb.2019.02717

Cited by 98 publications

(57 citation statements)

References 162 publications

(122 reference statements)

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“…Tight packing of individual α-helix or β-sheet motifs of the polymer chains into a supercoiled strand confers mechanical stability to the resultant structure (Onifade et al, 1998). Also, keratin is categorized as hard or soft in relation to the sulfur group content, site of occurrence, and functional involvement of the polypeptide (Li, 2019). The keratin in nails, feathers, horns, and hooves are said to be hard due to their involvement in structural and protective roles against predation and abiotic factors, hence the toughness (Wang B. et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Microbial Keratinase: Next Generation Green Catalyst and Prospective Applications

et al. 2020

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The search for novel renewable products over synthetics hallmarked this decade and those of the recent past. Most economies that are prospecting on biodiversity for improved bio-economy favor renewable resources over synthetics for the potential opportunity they hold. However, this field is still nascent as the bulk of the available resources are non-renewable based. Microbial metabolites, emphasis on secondary metabolites, are viable alternatives; nonetheless, vast microbial resources remain under-exploited; thus, the need for a continuum in the search for new products or bio-modifying existing products for novel functions through an efficient approach. Environmental distress syndrome has been identified as a factor that influences the emergence of genetic diversity in prokaryotes. Still, the process of how the change comes about is poorly understood. The emergence of new traits may present a high prospect for the industrially viable organism. Microbial enzymes have prominence in the bio-economic space, and proteases account for about sixty percent of all enzyme market. Microbial keratinases are versatile proteases which are continuously gaining momentum in biotechnology owing to their effective bio-conversion of recalcitrant keratin-rich wastes and sustainable implementation of cleaner production. Keratinase-assisted biodegradation of keratinous materials has revitalized the prospects for the utilization of cost-effective agro-industrial wastes, as readily available substrates, for the production of high-value products including amino acids and bioactive peptides. This review presented an overview of keratin structural complexity, the potential mechanism of keratin biodegradation, and the environmental impact of keratinous wastes. Equally, it discussed microbial keratinase; vis-à-vis sources, production, and functional properties with considerable emphasis on the ecological implication of microbial producers and catalytic tendency improvement strategies. Keratinase applications and prospective high-end use, including animal hide processing, detergent formulation, cosmetics, livestock feed, and organic fertilizer production, were also articulated.

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Section: Introductionmentioning

confidence: 99%

Microbial Keratinase: Next Generation Green Catalyst and Prospective Applications

et al. 2020

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“…Главным их преимуществом является способность связываться с нерастворимыми субстратами и расщеплять дисульфидные связи, которые неподатливы действию протеаз других групп (Qiu et al, 2020). Кератиназы способны расщеплять белки растительного и животного происхождения (Lin et al, 1996;Gradišar et al, 2005).…”

Section: кормопроизводство кормление с/х животныхunclassified

“…Выявлено лишь небольшое количество кератиназ, которое соответствует этим требованиям (Huang et al, 2015). Несмотря на прогресс в изучении механизма действия кератиназ, требуются дополнительные исследования для изучения ферментов, разлагающих кератин (Li, 2019).…”

Section: кормопроизводство кормление с/х животныхunclassified

Proteases in the diet of monogastric animals

Крюков¹,

Зиновьев

Некрасов³

2021

Agrarnaâ nauka

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There are many proteases, and about 2% of the human genome is involved in the regulation of their formation. The share of proteases involved in digestion accounts for only a small part. Despite this, the mechanisms of action of digestive proteases are less studied than carbohydrases and lipases. The incorporation of exogenous proteases into young animal feeds is often accompanied by improved utilization of protein and other nutrients. Exogenous proteases degrade inhibitors of the endogenous protease and lectins in feed. Alkaline proteases are of interest due to their broader substrate specificity and activity throughout the entire gastrointestinal tract. This group includes keratinases, which digest proteins inaccessible for cleavage by proteases and peptidases of animals. Keratinases digest agglutinins, glycinin and b-conglycinin and connective tissue proteins, which are resistant to the action of gastrointestinal enzymes and a number of exogenous proteases. The alleged reasons for the inconsistent results when using feed proteases are described. Their mediated positive effects not associated with proteolysis are indicated. It is advisable to use proteases with keratinolytic activity as fodder proteases.

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“…Specifically, arabitol is well known as fungal spore tracer (Jia and Fraser, 2011;Yang et al, 2012). In addition, Pro is a widely recognized degradation product of the organic matter by bacteria and fungi (Li, 2019).…”

Section: Potential Elucidation Of Chemical Signals From Microbes In Amentioning

confidence: 99%

“…Bacteria, typical size range from 0.6 to 7.0 µm, can be found in the atmosphere as individual cells, attached to other particles or as an agglomerate (Lighthart, 1997). Bacterial air emission depends on many factors such as seasonality, meteorological factors, variability of bacterial sources and anthropogenic influence (Fang et al, 2018).…”

mentioning

confidence: 99%

Chemical and microbiological characterization of primary biological aerosol particles at the boreal forest

Ruiz‐Jiménez

Okuljar

Sietiö

et al. 2020

Preprint

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Abstract. Primary biological aerosol particles (PBAPs) play an important role in the interaction between biosphere, atmosphere and climate, affecting cloud and precipitation formation processes. The contribution of pollen, plant fragments, spores, bacteria, algae and viruses to PBAPs is well known. In order to explore the complex interrelationships between airborne and particulate chemical traces (amino acids, saccharides), gene copy numbers, gas phase chemistry and the particle size distribution, 84 size-segregated aerosol samples from four particle size fractions ( 10 µm) were collected at SMEAR II station, Finland in autumn 2017. The gene copy numbers and size distribution of bacteria, Pseudomonas and fungi in PBAPs were determined by DNA extraction and amplification. In addition, free amino acids (19) and saccharides (8) were analyzed in aerosol samples by hydrophilic interaction liquid chromatography -mass spectrometry (HILIC-MS). Different machine learning (ML) approaches, such as cluster analysis, discriminant analysis, neural network and multiple linear regression (MLR) were used for the clarification of several aspects related to the PBAPs composition. Clear variations were observed for the composition of PBAPs as a function of the particle size. In most cases, the highest concentration values, gene copy numbers in the case of microbes, were observed for 2.5–10 µm particles followed by > 10 µm, 1–2.5 µm and

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Progress in Microbial Degradation of Feather Waste

Cited by 98 publications

References 162 publications

Microbial Keratinase: Next Generation Green Catalyst and Prospective Applications

Microbial Keratinase: Next Generation Green Catalyst and Prospective Applications

Proteases in the diet of monogastric animals

Chemical and microbiological characterization of primary biological aerosol particles at the boreal forest

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