昆虫门假单胞菌L48 百欧质粒菌株
小杨 / 2020-01-13 09:26:03
基本信息
平台编号：bio-82073
规格：冰袋泡沫盒快递
中文译名：昆虫门假单胞菌L48
拉丁名：Pseudomonas entomophila L48
货期：款到1-3天出库
运输：冰袋泡沫盒快递
培养方式：LB,30℃
保存：1ml，甘油管，-80℃
Abstract
Abstract Image
A medium-chain-length (MCL) polyhydroxyalkanoates (PHAs) producer Pseudomonas entomophila L48 was investigated for microbial production of 3-hydroxydodecanote homopolymer. Pseudomonas entomophila L48 was found to produce MCL PHA consisting of 3-hydroxyhexanoate (3HHx), 3-hydroxyoctanoate (3HO), 3-hydroxydecanoate (3HD), and 3-hydroxydodecanoate (3HDD) from related carbon sources fatty acids. In this study, some of the genes encoding key enzymes in β-oxidation cycle of P. entomophila such as 3-hydroxyacyl-CoA dehydrogenase, 3-ketoacyl-CoA thiolase, and acetyl-CoA acetyltransferase were deleted to study the relationship between β-oxidation and PHA synthesis in P. entomophila. Among the mutants constructed, P. entomophila LAC26 accumulated over 90 wt % PHA consisting of 99 mol % 3HDD. A fed-batch fermentation process carried out in a 6 L automatic fermentor produced 7.3 g L–1 PHA consisting of over 97 mol % 3HDD fraction. Properties of MCL PHA were significantly improved along with increasing 3HDD contents. P(2.1 mol % 3HD-co-97.9 mol % 3HDD) produced by P. entomophila LAC25 had the widest temperature range between Tg and Tm, which were −49.3 and 82.4 °C, respectively, in all MCL PHA reported so far. The new type of PHA also represented high crystallinity caused by side-chain crystallization compared with short side chain PHA. For the first time, P(3HDD) homopolymers were obtained.
所谓的质粒是细菌、酵母菌和放线菌等生物中染色体（或拟核）以外的DNA分子，存在于细胞质中（但酵母除外，酵母的2 μm质粒存在于细胞核中），具有自主复制能力，使其在子代细胞中也能保持恒定的拷贝数，并表达所携带的遗传信息，是闭合环状的双链DNA分子。质粒不是细菌生长繁殖所必需的物质，可自行丢失或人工处理而消除，如高温、紫外线等。质粒携带的遗传信息能赋予宿主菌某些生物学性状，有利于细菌在特定的环境条件下生存。
质粒(plasmid) 广泛存在于生物界，从细菌、放线菌、丝状真菌、大型真菌、酵母到植物，甚至人类机体中都含有。从分子组成看，有DNA 质粒，也有RNA 质粒; 从分子构型看，有线型质粒、也有环状质粒: 其表型也多种多样。细菌质粒是基因工程中最常用的载体。
中国微生物菌种查询网作为中国微生物菌种中心引航者，单位代为引进美国ATCC微生物菌种保藏中心，德国DSMZ菌种保藏中心，荷兰CBS菌种保藏中心，日本JCM微生物菌种保藏中心，包括其中的ATCC微生物细菌与噬菌体（18382）；细胞系和杂交瘤（4997）；真菌和酵母（58183）；原代细胞（146）；原生动物和藻类（2428）；干细胞（102）；载体，克隆与分子（18006）；病毒（3594）；核酸 - DNA / RNA（1350），引进进口微生物菌种货期短，质量保证，UPS国际快递运输。