To deepen the understanding in the effect of potassium lactate on the sensory quality and safety of Rugao ham,sensory attributes,physicochemical parameters,total volatile basic nitrogen(TVBN),microorganism community a...To deepen the understanding in the effect of potassium lactate on the sensory quality and safety of Rugao ham,sensory attributes,physicochemical parameters,total volatile basic nitrogen(TVBN),microorganism community and biogenic amines of Rugao ham manufactured with different potassium lactate levels(0%,0.5%,1%,2%)were investigated;the relationship between microbial community and the formation of TVBN and biogenic amines was further evaluated.With the increase of potassium lactate from 0%to 2%,the increased sensory scores and the decreased total aerobic bacterial count and TVBN were observed;the abundance of Staphylococcus increased,while the content of Halomonas decreased.LDA effect size(LEf Se)and correlations analysis showed that Staphylococcus equorum and Lactobacillus fermentum could be the key species to improve sensory scores and decrease biogenic amines and TVBN.Metabolic pathway analysis further showed that amino acids metabolism and nitrogen metabolism were mainly involved in decreasing TVBN and biogenic amines in the treatment of 2%potassium lactate.展开更多
Rugao in Jiangsu Province has sped up its development of foreignfunded enterprises by taking advantage of the ancient city, the Yangtze River and the East Sea, through domestic unity and the introduction of foreign ca...Rugao in Jiangsu Province has sped up its development of foreignfunded enterprises by taking advantage of the ancient city, the Yangtze River and the East Sea, through domestic unity and the introduction of foreign capital, with an open economy as the starting point, and foreign cooperation promoting展开更多
【目的】试验旨在探究CCAAT/增强子结合蛋白α(CCAAT/enhancer binding protein alpha,CEBPA)基因在如皋黄鸡中的生物学特征、组织表达水平,并构建其表达载体。【方法】对如皋黄鸡CEBPA基因CDS区进行克隆并测序,与其他物种进行相似性比...【目的】试验旨在探究CCAAT/增强子结合蛋白α(CCAAT/enhancer binding protein alpha,CEBPA)基因在如皋黄鸡中的生物学特征、组织表达水平,并构建其表达载体。【方法】对如皋黄鸡CEBPA基因CDS区进行克隆并测序,与其他物种进行相似性比对及系统进化树构建,通过生物信息学软件对如皋黄鸡CEBPA蛋白的理化性质、磷酸化位点、糖基化位点、功能结构域、互作蛋白及二级结构、三级结构进行预测。利用实时荧光定量PCR技术检测CEBPA基因在如皋黄鸡心脏、肝脏、肺脏、肾脏、十二指肠、空肠、腺胃、肌肉、睾丸中的表达情况。构建CEBPA基因过表达(OE-CEBPA)和干扰载体(CEBPA-sh12,CEBPA-sh167,CEBPA-sh727),并检测各载体活性。【结果】如皋黄鸡CEBPA基因CDS区序列全长975 bp,共编码324个氨基酸。相似性比对结果显示,如皋黄鸡与日本鹌鹑、鸿雁、野鸽、野鸭的CEBPA氨基酸序列相似性均>94%,其中与日本鹌鹑的相似性最高,达99.4%;系统进化树结果表明,如皋黄鸡与日本鹌鹑的亲缘关系较近,与哺乳动物的亲缘关系较远。如皋黄鸡CEBPA蛋白为亲水不稳定蛋白,存在25个磷酸化位点,含9个N-糖基化位点和109个O-糖基化位点;CEBPA蛋白具有1个转录激活区和1个与DNA结合的亮氨酸拉链结构bZIP;如皋黄鸡CEBPA蛋白二级结构主要由193个无规则卷曲、93个α-螺旋、25个延伸链和13个β-转角组成,三级结构预测结果与二级结构基本一致;CEBPA蛋白主要与TRIB1、PPARG、RXRA、MAPK9、MAPK10、JUN、ESR1等蛋白互作。CEBPA基因在如皋黄鸡各组织中均有表达,其中以肝脏中表达量最高。成功构建CEBPA过表达载体和3个干扰载体,将它们分别转染至鸡成纤维细胞,与对照组相比,过表达组(OE-CEBPA)CEBPA基因表达量显著升高(P<0.05),干扰组(CEBPA-sh167)CEBPA基因表达量显著下降(P<0.05)。【结论】试验获得如皋黄鸡CEBPA基因完整CDS区并成功构建与筛选出具有过表达/干扰活性最佳的鸡CEBPA表达载体,该基因在如皋黄鸡各组织中广泛表达,其中以肝脏中相对表达量较高。结果为进一步研究鸡CEBPA的功能提供了参考依据。展开更多
基金supported by National Natural Science Foundation of China(32022066,32101975)Zhejiang Province Natural Science Foundation(LQ22C200017)+1 种基金China Postdoctoral Foundation(2020M681806,2021T140348)Science and Technology Programs of Ningbo(202003N4130,202002N3067)。
文摘To deepen the understanding in the effect of potassium lactate on the sensory quality and safety of Rugao ham,sensory attributes,physicochemical parameters,total volatile basic nitrogen(TVBN),microorganism community and biogenic amines of Rugao ham manufactured with different potassium lactate levels(0%,0.5%,1%,2%)were investigated;the relationship between microbial community and the formation of TVBN and biogenic amines was further evaluated.With the increase of potassium lactate from 0%to 2%,the increased sensory scores and the decreased total aerobic bacterial count and TVBN were observed;the abundance of Staphylococcus increased,while the content of Halomonas decreased.LDA effect size(LEf Se)and correlations analysis showed that Staphylococcus equorum and Lactobacillus fermentum could be the key species to improve sensory scores and decrease biogenic amines and TVBN.Metabolic pathway analysis further showed that amino acids metabolism and nitrogen metabolism were mainly involved in decreasing TVBN and biogenic amines in the treatment of 2%potassium lactate.
文摘Rugao in Jiangsu Province has sped up its development of foreignfunded enterprises by taking advantage of the ancient city, the Yangtze River and the East Sea, through domestic unity and the introduction of foreign capital, with an open economy as the starting point, and foreign cooperation promoting
文摘【目的】试验旨在探究CCAAT/增强子结合蛋白α(CCAAT/enhancer binding protein alpha,CEBPA)基因在如皋黄鸡中的生物学特征、组织表达水平,并构建其表达载体。【方法】对如皋黄鸡CEBPA基因CDS区进行克隆并测序,与其他物种进行相似性比对及系统进化树构建,通过生物信息学软件对如皋黄鸡CEBPA蛋白的理化性质、磷酸化位点、糖基化位点、功能结构域、互作蛋白及二级结构、三级结构进行预测。利用实时荧光定量PCR技术检测CEBPA基因在如皋黄鸡心脏、肝脏、肺脏、肾脏、十二指肠、空肠、腺胃、肌肉、睾丸中的表达情况。构建CEBPA基因过表达(OE-CEBPA)和干扰载体(CEBPA-sh12,CEBPA-sh167,CEBPA-sh727),并检测各载体活性。【结果】如皋黄鸡CEBPA基因CDS区序列全长975 bp,共编码324个氨基酸。相似性比对结果显示,如皋黄鸡与日本鹌鹑、鸿雁、野鸽、野鸭的CEBPA氨基酸序列相似性均>94%,其中与日本鹌鹑的相似性最高,达99.4%;系统进化树结果表明,如皋黄鸡与日本鹌鹑的亲缘关系较近,与哺乳动物的亲缘关系较远。如皋黄鸡CEBPA蛋白为亲水不稳定蛋白,存在25个磷酸化位点,含9个N-糖基化位点和109个O-糖基化位点;CEBPA蛋白具有1个转录激活区和1个与DNA结合的亮氨酸拉链结构bZIP;如皋黄鸡CEBPA蛋白二级结构主要由193个无规则卷曲、93个α-螺旋、25个延伸链和13个β-转角组成,三级结构预测结果与二级结构基本一致;CEBPA蛋白主要与TRIB1、PPARG、RXRA、MAPK9、MAPK10、JUN、ESR1等蛋白互作。CEBPA基因在如皋黄鸡各组织中均有表达,其中以肝脏中表达量最高。成功构建CEBPA过表达载体和3个干扰载体,将它们分别转染至鸡成纤维细胞,与对照组相比,过表达组(OE-CEBPA)CEBPA基因表达量显著升高(P<0.05),干扰组(CEBPA-sh167)CEBPA基因表达量显著下降(P<0.05)。【结论】试验获得如皋黄鸡CEBPA基因完整CDS区并成功构建与筛选出具有过表达/干扰活性最佳的鸡CEBPA表达载体,该基因在如皋黄鸡各组织中广泛表达,其中以肝脏中相对表达量较高。结果为进一步研究鸡CEBPA的功能提供了参考依据。
