Abstract:
:Non-productive cellulase adsorption onto lignin is a major inhibitory mechanism preventing enzymatic hydrolysis of lignocellulosic feedstocks. Therefore, understanding of enzyme-lignin interactions is essential for the development of enzyme mixtures and processes for lignocellulose hydrolysis. We have studied cellulase-lignin interactions using model enzymes, Melanocarpus albomyces Cel45A endoglucanase (MaCel45A) and its fusions with native and mutated carbohydrate-binding modules (CBMs) from Trichoderma reesei Cel7A. Binding of MaCel45A to lignin was dependent on pH in the presence and absence of the CBM; at high pH, less enzyme bound to isolated lignins. Potentiometric titration of the lignin preparations showed that negatively charged groups were present in the lignin samples and that negative charge in the samples was increased with increasing pH. The results suggest that electrostatic interactions contributed to non-productive enzyme adsorption: Reduced enzyme binding at high pH was presumably due to repulsive electrostatic interactions between the enzymes and lignin. The CBM increased binding of MaCel45A to the isolated lignins only at high pH. Hydrophobic interactions are probably involved in CBM binding to lignin, because the same aromatic amino acids that are essential in CBM-cellulose interaction were also shown to contribute to lignin-binding.
journal_name
Enzyme Microb Technoljournal_title
Enzyme and microbial technologyauthors
Rahikainen JL,Evans JD,Mikander S,Kalliola A,Puranen T,Tamminen T,Marjamaa K,Kruus Kdoi
10.1016/j.enzmictec.2013.07.003subject
Has Abstractpub_date
2013-10-10 00:00:00pages
315-21issue
5eissn
0141-0229issn
1879-0909pii
S0141-0229(13)00155-5journal_volume
53pub_type
杂志文章abstract::We report a new colorimetric assay to quantify endo-polygalacturonase activity, which hydrolyzes polygalacturonic acid to produce smaller chains of galacturonate. Some of the reported polygalacturonase assays measure the activity by detecting the appearance of reducing ends such as the Somogyi-Nelson method. As a resu...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2010.04.004
更新日期:2011-02-08 00:00:00
abstract::The fatty acid methyl esters and fatty acid ethyl esters are known as biodiesels which are considered to be renewable, nontoxic and biodegradable biofuels. However, the conventional biodiesels show a high crystallization temperature which is one of the most critical obstacles against the widespread biodiesel usage. Th...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2017.03.012
更新日期:2017-07-01 00:00:00
abstract::The kinetics of erythromycin production were dependent on the identity of the growth rate-limiting nutrient during batch cultures of Saccharopolyspora erythraea. Semilogarithmic linear regression provided a single estimate of growth rate during the exponential phase, but partial cubic spline curve fit derivatives prov...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/0141-0229(93)90065-a
更新日期:1993-08-01 00:00:00
abstract::The selected thermotolerant, lactose-utilizing yeast strain Kluyveromyces marxianus NBIMCC 8362 possesses high specific d-amino acid oxidase activity (60Ug(-1)), which was increased nine-fold (545Ug(-1)) by design of the growth medium and conditions for d-amino oxidase induction. Applying an optimized simple and rapid...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2007.08.010
更新日期:2008-01-01 00:00:00
abstract::Phenylalanine ammonia-lyase (PAL) gene plays an important role in the synthesis of flavones, lignin, and other bioactive compounds in living organisms. Inonotus baumii, the only known flavone-producing filamentous fungus, is of great importance in the investigation of flavone metabolic pathways. To study the function ...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2017.10.010
更新日期:2018-05-01 00:00:00
abstract::In this work, a biosensor using a glassy carbon electrode modified with gold nanoparticles (AuNPs) and tyrosinase (Tyr) within a dihexadecylphosphate film is proposed. Cystamine and glutaraldehyde crosslinking agents were used as a support for Tyr immobilization. The proposed biosensor was characterized by scanning el...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2015.12.004
更新日期:2016-03-01 00:00:00
abstract::Microorganism selection is critical to deglycosylation in soybean fermentation for producing beneficial phytochemicals. This study investigated isoflavone bioconversion in soybean extract inoculated with Lactobacillus plantarum K2-12 and Lactobacillus curvatus JD0-31 exhibiting different enzyme activities. L. plantaru...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2019.109394
更新日期:2020-01-01 00:00:00
abstract::A method to stably immobilize microbes on electrodes was developed. Resting cells of Methylobacterium extorquens AM1(MeAM1) were caged within multiwalled carbon nanotubes (MWNTs)by adding the cells to a water dispersion of MWNTs then allowing the resulting mixture to dry on electrodes. The MeAM1-MWCNTs electrode thus ...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2018.06.004
更新日期:2018-10-01 00:00:00
abstract::Glucose is the typical carbon source for producing microbial polyunsaturated fatty acids (PUFA) with single cell microorganisms such as thraustochytrids. We assessed the use of a fish oil derived glycerol by-product (raw glycerol), produced by a fish oil processing plant, as a carbon source to produce single cell oil ...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2010.11.008
更新日期:2011-03-07 00:00:00
abstract::Industrial use of Novozym 435 in synthesis of structured lipids and biodiesel via alcoholysis is limited by mass transfer effects of the glycerides through immobilized enzymes and its low operational stability under operation conditions. To better understand this, differently modified Novozym 435 preparations, differi...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2016.04.007
更新日期:2016-08-01 00:00:00
abstract::Crocin, one of the major carotenoid pigments of Crocus sativus (saffron), is responsible for antioxidant activity, neuroprotection, and the inhibition of tumor cell proliferation. In order to improve the functionality of crocin, α-glucosyl-(1→6)-trans-crocins (C-Gs) were synthesized using sucrose and dextransucrase fr...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2020.109630
更新日期:2020-10-01 00:00:00
abstract::By using very active and very stable penicillin G acylase (PGA)--agarose derivatives we have studied the industrial design of equilibrium-controlled synthesis of lactamic antibiotics. In the presence of high concentrations of organic cosolvents we have carried out the direct enzymatic condensation of phenylacetic acid...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/0141-0229(91)90106-k
更新日期:1991-11-01 00:00:00
abstract::Filamentous fungal secretomes comprise highly dynamic sets of proteins, including multiple carbohydrate active enzymes (CAZymes) which are able to hydrolyze plant biomass polysaccharides into products of biotechnological interest such as fermentable sugars. In recent years, proteomics has been used to identify and qua...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章,评审
doi:10.1016/j.enzmictec.2017.08.007
更新日期:2018-02-01 00:00:00
abstract::Magnetosomes are intracellular structures produced by magnetotactic bacteria and are magnetic nanoparticles surrounded by a lipid bilayer membrane. Magnetosomes reportedly possess intrinsic enzyme mimetic activity similar to that found in horseradish peroxidase (HRP) and can scavenge reactive oxygen species depending ...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2015.02.009
更新日期:2015-05-01 00:00:00
abstract::Recently enzymatic catalysts have replaced organic and organometallic catalysts in the synthesis of bio-resorbable polymers. Enzymatic polymerization is considered as an alternative to conventional polymerization as they are less toxic, environmental friendly and can operate under mild conditions. In this research, th...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2018.12.001
更新日期:2019-03-01 00:00:00
abstract::Direct esterifications using a nylon-immobilized lipase from Candida cylindracea were carried out in batch and continuous-flow reactors. The immobilized enzyme was effective in catalyzing the synthesis of ethylpropionate, isoamylpropionate, and isoamylbutyrate. With ethanol dissolved in hexane as a substrate, the maxi...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/0141-0229(92)90054-r
更新日期:1992-11-01 00:00:00
abstract::Foaming, a proficient method for the recovery of surface active solutes from dilute solutions, was successfully applied for the concentration of the lipopeptide biosurfactant Surfactin from B. subtilis ATCC 21332 cell culture broths. Foaming was only partially successful in concentrating Surfactin when applied as a se...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/s0141-0229(00)00327-6
更新日期:2001-03-08 00:00:00
abstract::Phospholipase C (PLC) activity secreted by bacteria as a virulence factor is commonly detected by use of the artificial substrate p-nitrophenylphosphorylcholine (p-NPPC). We examined several commercially available enzymes (phosphodiesterases, phosphomonoesterases, phospholipase A, lipase, protease) for their hydrolyti...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/s0141-0229(99)00190-8
更新日期:2000-03-01 00:00:00
abstract::In the paper, a green and efficient biosynthetical technique was reported for preparing cadmium sulfide (CdS) quantum dots, in which Escherichia coli (E. coli) was chosen as a biomatrix. Fluorescence emission spectra and fluorescent microscopic photographs revealed that as-produced CdS quantum dots had an optimum fluo...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2016.09.017
更新日期:2017-01-01 00:00:00
abstract::An intracellular alcohol oxidase (AOX) was isolated from the white-rot basidiomycete Phanerochaete chrysosporium (Pch), grown on l-lactate induction medium, and purified to electrophoretic homogeneity. The dimeric protein consisted of two identical 75kDa subunits. The open reading frame of 1,956bp resulted in a monome...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2014.04.001
更新日期:2014-07-01 00:00:00
abstract::In our previous study, we produced α-keto acids by using an L-amino acid deaminase PmiLAAD (wide-type) from Proteus mirabilis, however, the catalytic efficiency was low due to its low substrate affinity. In this study, protein engineering of PmiLAAD was performed to improve the α-keto acid production. PmiLAAD was engi...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2019.109393
更新日期:2020-01-01 00:00:00
abstract::Enzymatic synthesis of cephalothin from 7-aminocephalosporanic acid (7-ACA) and amide derivatives of 2-thienylacetic acid (2-TA) using penicillin G acylase (pen G acylase) was studied. Two amide derivatives of 2-TA namely 2-thienylacetamide (2-TAA) and 2-thienylacetohydroxamic acid (2-TAH) were used in this study. The...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/s0141-0229(99)00153-2
更新日期:2000-02-01 00:00:00
abstract::We demonstrate the feasibility of growing crystals of protein in volumes as small as 1 nanoliter. Advances in the handling of very small volumes (i.e. through inkjet and other technologies) open the way towards fully automated systems. The rationale for these experiments is the desire to develop a system that speeds u...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/s0141-0229(01)00496-3
更新日期:2002-03-13 00:00:00
abstract::A colorimetric platform based on enzyme-inorganic hybrid nanoflowers was used for ultraviolet-visible detection of hydrogen peroxide (H2O2). The hybrid nanoflowers were prepared via incubation at room temperature using horseradish peroxidase (HRP) and copper phosphate (Cu3(PO4)2) as the organic and inorganic component...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2020.109620
更新日期:2020-10-01 00:00:00
abstract::Phytate is the major storage form of phosphorus in plants. It is present in cereals and raw materials of vegetable origin used in animal and human diets. However, non-ruminant animals have little phytase activity in their guts and, therefore, cannot digest phytate. As a result, almost all dietary phytate is discharged...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2020.109533
更新日期:2020-06-01 00:00:00
abstract::Mycobacterium tuberculosis acetohydroxyacid synthase (M. tuberculosis AHAS) has been proposed to bean essential target for novel herbicide- and chemical-based antibacterial agents. Therefore, here we investigated the roles of multiple conserved herbicide-binding site residues (R318, A146, Q148, M512, and V513) in M. t...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2015.06.009
更新日期:2015-10-01 00:00:00
abstract::In the present investigation, the bacterium Escherichia coli (VM1) was isolated from a marine sediments of Ennore coastal water along southeast coast of India was exploited for its capability of Ag NPs synthesis. The derived nanoparticles were characterized employing ultraviolet-visible (UV-vis) spectroscopy, Fourier ...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2016.09.008
更新日期:2016-12-01 00:00:00
abstract::In this study, we report the enzymatic production of glycerol acetate from glycerol and methyl acetate. Lipases are essential for the catalysis of this reaction. To find the optimum conditions for glycerol acetate production, sequential experiments were designed. Type of lipase, lipase concentration, molar ratio of re...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2014.11.004
更新日期:2015-02-01 00:00:00
abstract::Fremyella diplosiphon is a freshwater cyanobacterium that has great potential as a biofuel agent due to its ability to grow in low light intensity and acclimation to different wavelengths. To enhance its halotolerance for growth in 35gL-1 sodium chloride (NaCl), plasmids harboring hemolysin B (hlyB) and malate dehydro...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2017.04.009
更新日期:2017-08-01 00:00:00
abstract::Gamma glutamyl transpeptidase from Bacillus pumilus KS12 (GGTBP) was cloned, expressed in pET-28-E. coli expression system as a heterodimeric enzyme with molecular weights of 45 and 20 kDa for large and small subunit, respectively. It was purified by nickel affinity chromatography with hydrolytic and transpeptidase ac...
journal_title:Enzyme and microbial technology
pub_type: 杂志文章
doi:10.1016/j.enzmictec.2011.08.005
更新日期:2012-03-10 00:00:00