共 288 篇

Biochemical characterization of the carotenoid 1,2-hydratases (CrtC) from Rubrivivax gelatinosus and Thiocapsa roseopersicina

Applied Microbiology and Biotechnology · 2011 · 10.1007/s00253-011-3324-1 · 含路线图 · 有原文

核心问题:表征两种光合细菌来源的类胡萝卜素1,2-水合酶(CrtC)的生化特性,评估其作为生物催化剂用于绿色水合反应合成叔醇的潜力。

关键发现:两种CrtC均无需辅因子即可催化番茄红素水合生成1-HO-番茄红素和1,1'-(HO)2-番茄红素,转化率30%,单/双羟基化产物比例2:1 等 8 条

酶工程 BiocatalysisCarotenoid hydrataseCrtCEnzyme kineticsHydro-lyaseRecombinant expression Escherichia coli BL21... Escherichia coli BL21...

cDNA cloning of a novel gene codifying for the enzyme lycopene β-cyclase from Ficus carica and its expression in Escherichia coli

Applied Microbiology and Biotechnology · 2011 · 10.1007/s00253-011-3488-8 · 含路线图 · 有原文

核心问题:无花果中类胡萝卜素合成途径的基因尚未被鉴定,β-胡萝卜素作为重要营养素和抗氧化剂市场需求大,而生物法产量低,需要克隆关键酶基因用于异源生产。

关键发现:克隆的Lyc-βFc cDNA ORF长1488 bp,编码496个氨基酸,蛋白表观分子量56 kDa 等 4 条

代谢工程 Ficus caricaLycopene β-cyclasecDNAβ-Carotene Escherichia coli BL21... Escherichia coli BL21... Escherichia coli BL21...

Characterization of a novel ginsenoside-hydrolyzing α-L-arabinofuranosidase, AbfA, from Rhodanobacter ginsenosidimutans Gsoil 3054T

Applied Microbiology and Biotechnology · 2011 · 10.1007/s00253-011-3614-7 · 含路线图 · 有原文

核心问题:人参皂苷Rc转化为Rd需要特异性水解α-L-阿拉伯呋喃糖基的酶,但此前缺乏这类酶的克隆和生化表征,限制了稀有人参皂苷的酶法生产。

关键发现:重组AbfA以pNPAf和人参皂苷Rc为底物时,Km分别为0.53±0.07 mM和0.30±0.07 mM,Vmax分别为27.1±1.7和49.6±4.1 μmol min⁻¹ mg⁻¹ 等 9 条

代谢工程 BiotransformationCompound McCompound MclGinseng saponin Escherichia coli BL21... Rhodanobacter ginseno...

Effect of pretreatment of hydrothermally processed rice straw with laccase-displaying yeast on ethanol fermentation

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-3876-8 · 含路线图 · 有原文

核心问题:木质纤维素生物质中木质素抑制纤维素酶解和发酵,传统预处理成本高,需开发低成本的木质素降解预处理方法

关键发现:克隆了漆酶I基因(GenBank登录号JF825479),含10个内含子 等 6 条

发酵工程 BiorefineryCell surface engineering of yeastLaccaseLigninTrametes sp. Trametes sp. Ha1 Saccharomyces cerevis... Saccharomyces cerevis...

Completing the series of BVMOs involved in camphor metabolism of Pseudomonas putida NCIMB 10007 by identification of the two missing genes, their functional expression in E. coli, and biochemical characterization

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-011-3859-1 · 含路线图 · 有原文

核心问题:完成樟脑降解代谢中Baeyer-Villiger单加氧酶系列缺失的两个酶——3,6-diketocamphane 1,6-monooxygenase (3,6-DKCMO) 和 2-oxo-Δ3-4,5,5-trimethylcyclopentylacetyl-CoA monooxygenas...

关键发现:OTEMO对(±)-cis-bicyclo[3.2.0]hept-2-en-6-one的kcat/KM为49.3 mM^-1 s^-1,对环丁酮为14.7 mM^-1 s^-1 等 5 条

酶工程 / 生物催化 Baeyer-Villiger monooxygenaseBicyclic ketonesCamphorPseudomonas putida E. coli BL21(DE3) E. coli BL21(DE3) Pseudomonas putida NC...

Deletion of lactate dehydrogenase in Enterobacter aerogenes to enhance 2,3-butanediol production

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-3883-9 · 含路线图 · 有原文

核心问题:2,3-丁二醇是重要的生物基化学品,但产气肠杆菌发酵过程中会产生大量副产物乳酸,与2,3-丁二醇竞争丙酮酸和NADH,降低产量。

关键发现:敲除ldhA后,乳酸产量从9.88 g/L降至0.34 g/L(下降97%) 等 4 条

代谢工程 2,3-ButanediolEnterobacter aerogenesFed-batch fermentationLactate dehydrogenase Enterobacter aerogene... Enterobacter aerogene... Enterobacter aerogene...

High-temperature sorbose fermentation with thermotolerant Gluconobacter frateurii CHM43 and its mutant strain adapted to higher temperature

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4005-4 · 含路线图 · 有原文

核心问题:高温下Gluconobacter frateurii CHM43的L-山梨糖发酵效率低,需开发耐高温菌株以降低工业冷却成本。

关键发现:在38.5°C摇瓶培养中,适应株CHM43AD能将近100%的D-山梨醇转化为L-山梨糖,而野生型仅转化60%。在罐发酵中,CHM43AD在39°C完全转化10% D-山梨醇,40°C时转化约60% 等 4 条

发酵工程 AdaptationGluconobacterPQQQuinoprotein glycerol dehydrogenaseSorbose fermentationThermotolerance Gluconobacter frateur... Gluconobacter frateur... Gluconobacter frateur...

Improvements in ethanol production from xylose by mating recombinant xylose-fermenting Saccharomyces cerevisiae strains

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-3914-6 · 含路线图 · 有原文

核心问题:重组酿酒酵母利用木糖发酵乙醇的效率较低,木糖是木质纤维素半纤维素的主要成分,需要提高木糖转化乙醇的能力。

关键发现:杂交二倍体菌株MN8140XX的木糖消耗速率为2.73 g/L/h,比亲本MT8-1X405(1.68 g/L/h)高1.6倍,比NBRC1440X(0.80 g/L/h)高3.4倍 等 3 条

代谢工程 乙醇生产二倍体木糖杂交酿酒酵母 Saccharomyces cerevis... Saccharomyces cerevis... Saccharomyces cerevis...

Enzymatic biotransformation of ginsenoside Rb1 to 20(S)-Rg3 by recombinant β-glucosidase from Microbacterium esteraromaticum

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-011-3861-7 · 含路线图 · 有原文

核心问题:野生人参中Rg3含量极低(<0.003%)且天然提取成本高,而人参皂苷Rb1含量丰富(约1-3%),需要通过酶法将Rb1转化为高价值稀有人参皂苷20(S)-Rg3。但已报道的纯化酶表达量低、纯化复杂(收率仅0.1-12%),缺乏高效重组酶用于Rg3制备。

关键发现:bgp1基因全长2,496 bp,编码831个氨基酸,属于糖苷水解酶家族3;重组Bgp1分子量为87.5 kDa;最适pH 等 3 条

代谢工程 BiotransformationGinsenoside 20(S)-Rg3Ginsenoside Rb1β-glucosidase Escherichia coli BL21... Microbacterium estera...

L-Pantoyl lactone dehydrogenase from Rhodococcus erythropolis: genetic analyses and application to the stereospecific oxidation of L-pantoyl lactone

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-3970-y · 含路线图 · 有原文

核心问题:实现D-泛酰内酯生产中L-泛酰内酯的立体选择性氧化,并构建L-泛酰内酯到D-泛酰内酯的立体转化途径,克服传统外消旋拆分50%理论产率限制。

关键发现:lpldh基因全长1179 bp,编码392个氨基酸,属于FMN依赖性α-羟基酸脱氢酶/氧化酶家族 等 5 条

代谢工程 Ketopantoyl lactoneL-Pantoyl lactone dehydrogenaseRhodococcus erythropolisStereoinversion Rhodococcus erythropo... Escherichia coli (pET... Escherichia coli (pET...

Functional characterization of Edwardsiella tarda twin-arginine translocation system and its potential use as biological containment in live attenuated vaccine of marine fish

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4462-9 · 含路线图 · 有原文

核心问题:阐明迟缓爱德华氏菌(Edwardsiella tarda)双精氨酸转运(Tat)系统的生物学功能,并探索将其作为海洋鱼类减毒活疫苗(LAV)生物遏制系统的可行性。

关键发现:E. tarda Tat系统功能正常,ssTorA::GFP在野生株中成熟转运至周质,在ΔtatABCD中滞留于胞质。 等 7 条

合成生物学 Biological containmentEdwardsiella tardaMarine fish vaccinologyTat system Edwardsiella tarda EI... Edwardsiella tarda EI... Edwardsiella tarda EI...

Enhancement of carotenoid biosynthesis in the green microalga Dunaliella salina with light-emitting diodes and adaptive laboratory evolution

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4502-5 · 含路线图 · 有原文

核心问题:利用LED窄光谱光源研究光质对杜氏盐藻(Dunaliella salina)生长和类胡萝卜素代谢的影响,并通过适应性实验室进化(ALE)提高β-胡萝卜素和叶黄素的产量,解决类胡萝卜素积累与生物量产量之间的权衡问题。

关键发现:最佳红光光通量为128 μE/m²/s,最大平均生长速率为0.32 gDCW/L/day 等 3 条

代谢工程 Adaptive laboratory evolutionCarotenoid metabolismDunaliella salinaLED-based photobioreactorβ-carotene and lutein Dunaliella salina

Characterization of the ginsenoside-transforming recombinant β-glucosidase from Actinosynnema mirum and bioconversion of major ginsenosides into minor ginsenosides

Applied Microbiology and Biotechnology · 2013 · 10.1007/s00253-012-4324-5 · 含路线图 · 有原文

核心问题:高效生物转化主要人参皂苷(Rb1、Rb2、Rc、Rd、Re、Rg1)为具有更强药理活性的稀有人参皂苷,需要能特异性水解葡萄糖基的酶。现有酶制剂转化途径单一,缺乏能水解多种糖基的酶。

关键发现:bglAm基因长1830 bp,编码609个氨基酸,预测分子量65,277 Da。重组BglAm最适pH 7.0,最适温度37°C。以PNPGlc为底物时Km为0.33±0.01 mM,Vmax为5.94±0.06 μmol/min/mg蛋白。对Rb1转化为Gyp XVII的Km为0.69±0... 等 8 条

代谢工程 Actinosynnema mirumBiotransformationGinsenosideGlycoside hydrolase Actinosynnema mirum K... Escherichia coli BL21...

Effects of membrane-bound glucose dehydrogenase overproduction on the respiratory chain of Gluconobacter oxydans

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4265-z · 含路线图 · 有原文

核心问题:研究膜结合PQQ依赖性葡萄糖脱氢酶(mGDH)在氧化葡萄糖杆菌中过表达后对呼吸链的影响,并建立膜整合醌蛋白的同源表达与一步纯化系统。

关键发现:mgdh基因转录水平较对照菌株提高9倍 等 6 条

代谢工程 Acetic acid bacteriaBiotransformationGluconateGlucose dehydrogenaseMembrane proteinOverexpression Gluconobacter oxydans... Gluconobacter oxydans... Gluconobacter oxydans...

Application of microorganisms towards synthesis of chiral terpenoid derivatives

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4304-9 · 含路线图 · 有原文

核心问题:化学合成手性萜类衍生物存在选择性差、副反应多、产率低、使用昂贵有毒金属催化剂等问题,需要绿色高效的替代方法。

关键发现:Rhizoctonia solani转化(-)-menthol 1得到(-)-6-hydroxymethanol 2 (65.2%)、(+)-6,8-dihydroxymethanol 4 (32.4%)和(-)-1-hydroxymethanol 3 (18.4%) 等 9 条

发酵工程 BiotransformationsMicroorganismsStereochemistryTerpenoids Rhizoctonia solani Botrytis cinerea Penicillium digitatum

Implementation of a transhydrogenase-like shunt to counter redox imbalance during xylose fermentation in Saccharomyces cerevisiae

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4298-3 · 含路线图 · 有原文

核心问题:木糖发酵过程中辅酶偏好差异导致的NADPH/NADH氧化还原失衡,引起木糖醇积累和乙醇产量降低

关键发现:YPH499XU/MAE1菌株乙醇产量为0.38±0.01 g/g木糖,高于对照的0.31±0.01 g/g木糖 等 5 条

代谢工程 Anaplerotic pathwayMalic enzymeSaccharomyces cerevisiaeTranshydrogenase-like shuntXylose fermentation Saccharomyces cerevis... Saccharomyces cerevis... Saccharomyces cerevis...

Codon modification for the DNA sequence of a single-chain Fv antibody against clenbuterol and expression in Pichia pastoris

Applied Microbiology and Biotechnology · 2013 · 10.1007/s00253-013-5324-9 · 含路线图 · 有原文

核心问题:克伦特罗单链抗体(CBL-scFv)在毕赤酵母中异源表达水平低,难以满足工业规模生产和免疫检测应用需求。

关键发现:密码子优化替换了124个氨基酸中156个核苷酸,G+C含量从53%降至47.2%,优化基因与原始基因相似性为79.4%;qPCR确认优化菌株与原始菌株基因拷贝数比值为1.38,排除了拷贝数影响;优化后CBL-scFv(41 kDa)在摇瓶中的产量为0.223 g/L,是原始基因表达量(0.09... 等 3 条

发酵工程 ClenbuterolCodon optimizationExpressionPichia pastorisSingle-chain variable fragment Pichia pastoris GS115 Pichia pastoris GS115 Pichia pastoris GS115

Expression of dehydrin gene from Arctic Cerastium arcticum increases abiotic stress tolerance and enhances the fermentation capacity of a genetically engineered Saccharomyces cerevisiae laboratory strain

Applied Microbiology and Biotechnology · 2013 · 10.1007/s00253-013-4729-9 · 含路线图 · 有原文

核心问题:工业发酵中酿酒酵母常面临氧化、乙醇、低温等非生物胁迫,导致发酵效率下降。如何通过基因工程提高酵母的胁迫耐受性和发酵产量,尤其低温发酵性能,是核心问题。

关键发现:TG细胞在30°C发酵84 h最终酒精浓度13.3% (0.63±0.03 g/g),比WT的10.2% (0.48±0.04)提高23% 等 6 条

发酵工程 Cerastium arcticumDHN geneFermentation capacitySaccharomyces cerevisiaeStress tolerance Saccharomyces cerevis... Escherichia coli BL21...

Simultaneous improvement of saccharification and ethanol production from crystalline cellulose by alleviation of irreversible adsorption of cellulose with a cell surface-engineered yeast strain

Applied Microbiology and Biotechnology · 2012 · 10.1007/s00253-012-4587-x · 含路线图 · 有原文

核心问题:纤维素酶在结晶纤维素表面的不可逆吸附导致水解不完全,乙醇产量受限。

关键发现:96h水解50g/L Avicel时,47.1%的游离纤维素酶不可逆吸附,10.8%结晶纤维素残留 等 3 条

发酵工程 BioethanolCell surface displayCellulaseProtein adsorptionSaccharomyces cerevisiae Saccharomyces cerevis... Saccharomyces cerevis... Saccharomyces cerevis...

A new cytochrome P450 system from Bacillus megaterium DSM319 for the hydroxylation of 11-keto-β-boswellic acid (KBA)

Applied Microbiology and Biotechnology · 2013 · 10.1007/s00253-013-5029-0 · 含路线图 · 有原文

核心问题:从工业菌株Bacillus megaterium DSM319中鉴定并表征一种新型细胞色素P450系统(CYP106A1及其天然氧化还原伴侣),并用于催化五环三萜类化合物11-酮-β-乳香酸(KBA)的羟基化,以制备具有更高生物利用度的新型衍生物。

关键发现:['CYP106A1与已知的CYP106A2序列一致性为63%,其与KBA结合的K_D为92.25±2.98 μM,Hill常数n=1.46±0.02,显示正协同结合。', '体外重构实验表明,Fdx2和Fdx3作为电子供体时转化率最高(30分钟分别为79.6±6.9%和79.3±6.4%),... 等 3 条

代谢工程 11-Keto-β-boswellic acidBacillus megateriumCYP106A1Cytochromes P450FerredoxinFlavodoxin Bacillus megaterium M... Bacillus megaterium M... Bacillus megaterium M...