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新型α-葡萄糖苷酶Aga432分子改造及酶学性质分析
期刊论文 | 2025 , 46 (11) , 1-9 | 食品工业科技
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Abstract :

本研究旨在从类芽孢杆菌(Paenibacillus sp.)中克隆新型α-葡萄糖苷酶Aga432基因并通过定点突变提高α-葡萄糖苷酶Aga432的活性。从Paenibacillus sp.全基因组中获得表达α-葡萄糖苷酶的基因片段,进行序列分析,通过同源建模与分子对接并构建基因工程菌获得8株正向突变菌株,对重组Aga432和相对活性最高的正向突变体AT-2进行酶学性质研究,并探究重组α-葡萄糖苷酶Aga432、AT-2对生物膜的分散作用,评价其对小鼠胚胎成纤维细胞的毒性。结果表明,Aga432比活力为45.05 U/mg,突变体AT-2比活力为84.09 U/mg。与Aga432相比,AT-2的最适反应温度、最适反应pH改变并不明显,热稳定性有较大的提高,并且在酸性条件下较为稳定。突变体AT-2的Km为Aga432的1.87倍,Vmax值为Aga432的3.19倍,Kcat值为Aga432的2.33倍,Kcat/Km值为Aga432的1.07倍。体外细胞实验表明,15.0~30.0 μg/mL的Aga432、AT-2对细胞无明显毒性作用,具有良好的细胞相容性。生物膜分散作用结果表明,10.0~50.0 μg/mL浓度的两种重组α-葡萄糖苷酶对细菌生物膜具有显著的分散作用。本研究通过分子改造提升α-葡萄糖苷酶Aga432的热稳定性,为开发新型α-葡萄糖苷酶以及后续定向改造研究提供了基础和参考依据。

Keyword :

α-葡萄糖苷酶 α-葡萄糖苷酶 分子对接 分子对接 同源建模 同源建模 生物膜分散作用 生物膜分散作用 酶学性质 酶学性质

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GB/T 7714 路涵 , 方婷 , 牛晓旭 et al. 新型α-葡萄糖苷酶Aga432分子改造及酶学性质分析 [J]. | 食品工业科技 , 2025 , 46 (11) : 1-9 .
MLA 路涵 et al. "新型α-葡萄糖苷酶Aga432分子改造及酶学性质分析" . | 食品工业科技 46 . 11 (2025) : 1-9 .
APA 路涵 , 方婷 , 牛晓旭 , 翁晓敏 , 严芬 . 新型α-葡萄糖苷酶Aga432分子改造及酶学性质分析 . | 食品工业科技 , 2025 , 46 (11) , 1-9 .
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海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用
期刊论文 | 2025 , 46 (6) , 124-132 | 食品科学
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Abstract :

从海洋细菌Zobellia sp.B2中克隆新型纤维素酶CelL7基因,同时添加碳水化合物结合模块家族3(carbohydrate-binding module family 3,CBM3)基因构建融合基因CelL7-CBM3,并实现其编码的融合蛋白CelL7-CBM3在大肠杆菌BL21中实现异源表达,利用亲和层析柱获得纯化蛋白.CelL7基因序列全长1 077 bp,编码358 个氨基酸残基,理论蛋白分子质量为40.39 kDa.CelL7和CelL7-CBM3的比酶活力分别为2 249.81 U/mg和2 915.75 U/mg.CelL7与CelL7-CBM3的最适反应温度均为50℃,最适pH值分别为5.0和5.5,Mn2+和Fe2+能激活CelL7,Cu2+抑制CelL7的活力,CelL7可降解羧甲基纤维素钠、纤维二糖和木聚糖.以羧甲基纤维素钠为底物时,CelL7-CBM3的米氏常数(Km)为11.70 mg/mL,较CelL7的Km(13.23 mg/mL)有所降低,表明添加结合结构域后的融合酶对羧甲基纤维素钠的亲和力增强;最大反应速率(Vmax)为175.44 mg/(mL·min),催化常数(Kcat)为2.78 s-1,Kcat/Km为0.24 mL/(mg·s),与CelL7相比变化不大.生物膜清除实验表明,10.0~60.0 μg/mL的CelL7和30.0~60.0 μg/mL CelL7-CBM3能够有效分散生物膜,减少生物膜量.

Keyword :

异源表达 异源表达 生物膜清除 生物膜清除 纤维素酶 纤维素酶 结构域融合 结构域融合

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GB/T 7714 翁晓敏 , 胡诗琦 , 蔡佳琪 et al. 海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用 [J]. | 食品科学 , 2025 , 46 (6) : 124-132 .
MLA 翁晓敏 et al. "海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用" . | 食品科学 46 . 6 (2025) : 124-132 .
APA 翁晓敏 , 胡诗琦 , 蔡佳琪 , 洪健渠 , 严芬 . 海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用 . | 食品科学 , 2025 , 46 (6) , 124-132 .
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海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用 Scopus
期刊论文 | 2025 , 46 (6) , 124-132 | 食品科学
海洋来源纤维素酶CelL7的异源表达、酶学表征及生物膜清除作用 EI
期刊论文 | 2025 , 46 (6) , 124-132 | 食品科学
一种具有抗炎抗氧化活性的忧遁草多肽及其制备方法和应用 incoPat
专利 | 2022-04-28 00:00:00 | CN202210458985.7
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本发明涉及一种具有抗炎抗氧化活性的忧遁草多肽及其制备方法和应用,属于生物技术领域。所述忧遁草多肽序列的氨基酸序列为DKFEDNLYSAH,分子量为1338.2 Da。所述忧遁草多肽是以忧遁草为原料,采用超声辅助碱溶酸沉法获取忧遁草粗蛋白,再经分离纯化、鉴定、Fmoc固相合成得到的。试验证明,本发明所述忧遁草多肽具有很好的抗炎活性及抗氧化活性,具有很好的应用潜力和价值。

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GB/T 7714 严芬 , 刘文静 , 刘聪 et al. 一种具有抗炎抗氧化活性的忧遁草多肽及其制备方法和应用 : CN202210458985.7[P]. | 2022-04-28 00:00:00 .
MLA 严芬 et al. "一种具有抗炎抗氧化活性的忧遁草多肽及其制备方法和应用" : CN202210458985.7. | 2022-04-28 00:00:00 .
APA 严芬 , 刘文静 , 刘聪 , 陈晓杰 , 张帆 . 一种具有抗炎抗氧化活性的忧遁草多肽及其制备方法和应用 : CN202210458985.7. | 2022-04-28 00:00:00 .
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抑制香蕉采后病害的贝莱斯芽孢杆菌LZT14及其应用 incoPat
专利 | 2021-12-23 00:00:00 | CN202111586238.3
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本发明公开了一株抑制香蕉采后病害的贝莱斯芽孢杆菌LZT14及其应用,属于植物采后病害防治技术领域。所述菌株从福州大学荔枝树周围土壤样品中分离筛选得到,已于2021年8月16日保藏在中国微生物菌种保藏管理委员会普通微生物中心,保藏编号为CGMCC No.23150。该菌株抑菌谱广、且可应用于香蕉采后病害预防和贮藏保鲜。该菌株的使用方法为:菌株活化,洗涤后重悬;将菌悬液喷洒于香蕉表面,风干,放入0.015 mm厚的聚乙烯薄膜袋中,恒温恒湿贮藏。香蕉体内试验结果表明,在采后28℃,80%相对湿度环境中储藏时,该菌株可以明显降低香蕉的病情指数,生防应用前景良好。

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GB/T 7714 严芬 , 刘聪 , 陈晓杰 et al. 抑制香蕉采后病害的贝莱斯芽孢杆菌LZT14及其应用 : CN202111586238.3[P]. | 2021-12-23 00:00:00 .
MLA 严芬 et al. "抑制香蕉采后病害的贝莱斯芽孢杆菌LZT14及其应用" : CN202111586238.3. | 2021-12-23 00:00:00 .
APA 严芬 , 刘聪 , 陈晓杰 , 吴崟沣 , 方婷 . 抑制香蕉采后病害的贝莱斯芽孢杆菌LZT14及其应用 : CN202111586238.3. | 2021-12-23 00:00:00 .
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一种忧遁草抗氧化十一肽及其制备方法和应用 incoPat
专利 | 2022-01-28 00:00:00 | CN202210103859.X
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本专利公开了一种忧遁草的抗氧化十一肽及其制备方法和应用,所述抗氧化肽序列为DMGPPLSEKLH。本发明以忧遁草为原料,采用超声辅助碱溶酸提取技术进行制备,进一步通过离子色谱、反相高效液相色谱等分离纯化技术建立忧遁草抗氧化肽的纯化方法。体外抗氧化实验表明,所述忧遁草抗氧化十一肽可以有效清除DPPH、ABTS、羟基自由基等自由基,具有结构简单、抗氧化活力强、安全性高的特点,可以作为化学合成抗氧化剂的优良替代,而且具有一定的抗肿瘤活性,为食品、药品及化妆品行业研发新型天然添加剂提供了理论依据和实践参考。

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GB/T 7714 严芬 , 刘文静 , 张丹 et al. 一种忧遁草抗氧化十一肽及其制备方法和应用 : CN202210103859.X[P]. | 2022-01-28 00:00:00 .
MLA 严芬 et al. "一种忧遁草抗氧化十一肽及其制备方法和应用" : CN202210103859.X. | 2022-01-28 00:00:00 .
APA 严芬 , 刘文静 , 张丹 , 胡诗琦 , 吴崟沣 . 一种忧遁草抗氧化十一肽及其制备方法和应用 : CN202210103859.X. | 2022-01-28 00:00:00 .
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一种忧遁草抗氧化十三肽及其制备方法和应用 incoPat
专利 | 2022-03-23 00:00:00 | CN202210288893.9
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本发明涉及一种忧遁草抗氧化十三肽及其制备方法和应用,属于生物技术领域。所述抗氧化肽氨基酸序列为LLPENDPSANHLM,该抗氧化肽的制备方法是以忧遁草叶为原料,采用碱溶酸沉淀法提取粗制品,再经分离纯化、鉴定及合成技术得到所述抗氧化肽。药理实验证明,本发明提供的忧遁草抗氧化十三肽能在不同程度上保护HepG‑2细胞免受H2O2毒害,其具有结构简单、抗氧化活力强、安全性高的特点,可以作为化学合成抗氧化剂的优良替代。本发明也为食品、药品及化妆品行业研发新型天然添加剂提供了理论依据和实践参考。

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GB/T 7714 严芬 , 刘文静 , 张少龙 et al. 一种忧遁草抗氧化十三肽及其制备方法和应用 : CN202210288893.9[P]. | 2022-03-23 00:00:00 .
MLA 严芬 et al. "一种忧遁草抗氧化十三肽及其制备方法和应用" : CN202210288893.9. | 2022-03-23 00:00:00 .
APA 严芬 , 刘文静 , 张少龙 , 费庆彬 . 一种忧遁草抗氧化十三肽及其制备方法和应用 : CN202210288893.9. | 2022-03-23 00:00:00 .
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一种重组褐藻胶裂解酶AlyL7及其应用 incoPat
专利 | 2021-10-25 00:00:00 | CN202111240122.4
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本发明涉及一种重组褐藻胶裂解酶AlyL7及其应用,所述褐藻胶裂解酶的氨基酸序列如SEQ ID NO.1所示,其编码基因的核苷酸序列如SEQ ID NO.2所示。所述重组褐藻胶裂解酶属于双功能型褐藻胶裂解酶,其最适反应温度为40℃,最适反应pH为9.0,在0‑25℃、pH 5.0‑10.0的条件时较稳定,对海藻酸钠、聚古洛糖醛酸、聚甘露糖醛酸均具有降解活性。所述重组褐藻胶裂解酶也属于内切酶,其酶解海藻酸钠的终产物包括不饱和1‑5糖,以不饱和2‑3糖为主。所述褐藻胶裂解酶反应速度快,效率高,具有良好的工业化应用潜质。

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GB/T 7714 严芬 , 陈骏颖 , 钟金福 et al. 一种重组褐藻胶裂解酶AlyL7及其应用 : CN202111240122.4[P]. | 2021-10-25 00:00:00 .
MLA 严芬 et al. "一种重组褐藻胶裂解酶AlyL7及其应用" : CN202111240122.4. | 2021-10-25 00:00:00 .
APA 严芬 , 陈骏颖 , 钟金福 , 张少龙 . 一种重组褐藻胶裂解酶AlyL7及其应用 : CN202111240122.4. | 2021-10-25 00:00:00 .
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一株控制香蕉采后病害的酵母菌P4及其使用方法 incoPat
专利 | 2021-08-31 00:00:00 | CN202111008228.1
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本发明公开一株用于香蕉采后病害的酵母菌P4及其使用方法。所述酵母菌P4在中国微生物菌种保藏管理委员会普通微生物中心的保藏编号为CGMCC No.22561。所述酵母菌P4的使用方法为:菌株活化,菌体用无菌水配成1×108 cells/mL的菌悬液;将菌悬液喷洒于香蕉表面,自然晾干后,放入0.015 mm厚的聚乙烯薄膜袋中,恒温恒湿贮藏。所述酵母菌P4可以控制香蕉炭疽病,同时该菌株抑菌谱较广,可以控制黄曲霉、拟盘多毛孢属、枇杷胶孢炭疽菌、香蕉镰刀菌等。

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GB/T 7714 严芬 , 吴芸芸 , 蔡婷 et al. 一株控制香蕉采后病害的酵母菌P4及其使用方法 : CN202111008228.1[P]. | 2021-08-31 00:00:00 .
MLA 严芬 et al. "一株控制香蕉采后病害的酵母菌P4及其使用方法" : CN202111008228.1. | 2021-08-31 00:00:00 .
APA 严芬 , 吴芸芸 , 蔡婷 , 刘文静 , 张帆 . 一株控制香蕉采后病害的酵母菌P4及其使用方法 : CN202111008228.1. | 2021-08-31 00:00:00 .
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Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides SCIE
期刊论文 | 2023 , 253 | TALANTA
WoS CC Cited Count: 3
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In view of the biological significance and micro-heterogeneity of protein glycosylation for human health, specific enrichment of N-glycosylated proteins/peptides from complex biological samples is a prerequisite for the discovery of disease biomarkers and clinical diagnosis. In this work, we propose a "grafting-from" N-glycoprotein enriching method based on the in-situ growth of thermoresponsive polymer brushes from the N-glycosylated site of proteins. The initiator was first attached to the pre-oxidized glycan moieties by hydrazide chemistry, from which the thermoresponsive polymers can be grown to form giant protein-polymer conjugates (PPC). The thermosensitive PPC can be precipitated and separated by raising the temperature to above its lower critical solubility temperature (LCST). Mass spectrometry verified 210 N-glycopeptides corresponding to 136 N-glycoproteins in the rabbit serum. These results demonstrate the capability of the tandem thermoprecipitation strategy to enrich and separate N-glycoprotein/glycopeptide. Due to its simplicity and efficiency specifically, this method holds the potential for identifying biomarkers from biological samples in N-glycoproteome analysis.

Keyword :

Glycan-selective Glycan-selective glycopeptide glycopeptide N-Glycoprotein N-Glycoprotein Thermoprecipitation Thermoprecipitation

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GB/T 7714 Shu, Jingjing , Xiong, Wenli , Zhang, Ran et al. Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides [J]. | TALANTA , 2023 , 253 .
MLA Shu, Jingjing et al. "Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides" . | TALANTA 253 (2023) .
APA Shu, Jingjing , Xiong, Wenli , Zhang, Ran , Ma, Shanyun , Zhou, Kaiqiang , Wang, Xuwei et al. Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides . | TALANTA , 2023 , 253 .
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Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides Scopus
期刊论文 | 2023 , 253 | Talanta
Glycan-selective in-situ growth of thermoresponsive polymers for thermoprecipitation and enrichment of N-glycoprotein/glycopeptides EI
期刊论文 | 2023 , 253 | Talanta
Cloning, expression, and characterization of a novel endo-type alginate lyase from Microbulbifer sp. BY17 SCIE
期刊论文 | 2022 , 102 (11) , 4522-4531 | JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
WoS CC Cited Count: 5
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BACKGROUND Alginate oligosaccharides (AOS), with various physiological effects, have been widely used in the food, agricultural, and pharmaceutical industries. The biological enzymatic method of preparing AOS, using alginate lyase, has more advantages compared with physical and chemical methods. Cloning and heterologously expressing alginate lyase are therefore very important. RESULTS A novel alginate lyase, BY17PV7, from Microbulbifer sp. BY17, isolated from Gracilaria, was cloned and expressed in Escherichia coli BL21(DE3). BY17PV7 was about 27 KDa. BY17PV7 showed the greatest activity (150.42 +/- 3.32 U/mg) at 43 degrees C and pH 8.9. It could be activated by Ca2+, Mn2+, Co2+, Fe3+, Na+, and inhibited by Mg2+, Zn2+, Ba2+, Cu2+, sodium dodecyl sulfate (SDS), ethylene diamine tetraacetic acid (EDTA). BY17PV7 had a wide range of substrate specificity and good degradation effects for poly beta-D-mannuronate (polyM) and poly alpha-L-guluronate (polyG), demonstrating that it is a bifunctional alginate lyase. The kinetic parameters showed that BY17PV7 had a greater affinity for polyG. BY17PV7 released AOS with a degree of polymerization (DP) of 3-4 in an endolytic manner from sodium alginate. Alginate oligosaccharides showed strong antioxidant ability of reducing Fe3+ and scavenging radicals such as hydroxyl, 2,2-azion-bia (3-ethylbenzo-thiazoline-6-sulfonic acid diammonium salt) (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH). CONCLUSION A novel bifunctional alginate lyase, BY17PV7, was expressed and characterized in Escherichia coli BL21(DE3). The results were helpful for the analysis of the molecular mechanisms of degrading patterns in the polysaccharide lyase (PL) family. (c) 2022 Society of Chemical Industry.

Keyword :

alginate lyase alginate lyase alginate oligosaccharides alginate oligosaccharides degradation mode degradation mode heterologous expression heterologous expression Microbulbifer sp Microbulbifer sp

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GB/T 7714 Yan, Fen , Chen, Junying , Cai, Ting et al. Cloning, expression, and characterization of a novel endo-type alginate lyase from Microbulbifer sp. BY17 [J]. | JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE , 2022 , 102 (11) : 4522-4531 .
MLA Yan, Fen et al. "Cloning, expression, and characterization of a novel endo-type alginate lyase from Microbulbifer sp. BY17" . | JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 102 . 11 (2022) : 4522-4531 .
APA Yan, Fen , Chen, Junying , Cai, Ting , Zhong, Jinfu , Zhang, Shaolong . Cloning, expression, and characterization of a novel endo-type alginate lyase from Microbulbifer sp. BY17 . | JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE , 2022 , 102 (11) , 4522-4531 .
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Cloning, expression, and characterization of a novel endo-type alginate lyase from Microbulbifer sp. BY17 Scopus
期刊论文 | 2022 , 102 (11) , 4522-4531 | Journal of the Science of Food and Agriculture
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