NTL4(pZLR4) BioVector® Agrobacterium tumefaciens Strain检测 N-酰基高丝氨酸内酯(AHL)群体感应信号的生物报告菌
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- 货 号:BioVector®-NTL4(pZLR4)
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BioVector® Agrobacterium tumefaciens NTL4(pZLR4) Strain
English Version
1. Strain Overview
Strain Name: BioVector® NTL4(pZLR4)
ATCC Number: BAA-2240™
Species:Agrobacterium fabrum (formerly Agrobacterium tumefaciens, Rhizobium radiobacter)
Type Strain: No
Biosafety Level: BSL-1
Year of Origin: 1996
Depositor: S. Farrand, University of Illinois
Genome Sequenced: Yes (ATCC Genome Portal)
2. Description and Applications
BioVector® NTL4(pZLR4) is a recombinant bacterial strain derived from Agrobacterium fabrum strain NTL4 via transformation with the recombinant plasmid pZLR4. This strain is specifically engineered to function as a bioreporter for detecting N-acyl homoserine lactone (AHL) quorum-sensing signals.
The strain detects medium- to long-chain AHLs, including:
C6-AHL, C10-AHL, C12-AHL, C14-AHL
C6-3-hydroxy-AHL, C8-3-hydroxy-AHL, C10-3-hydroxy-AHL
All 3-oxo-AHLs (e.g., 3OC6, 3OC8, 3OC10, 3OC12, 3OC14)
3. Genetic Features
Host Strain (NTL4):
Derived from Agrobacterium fabrum (formerly A. tumefaciens)
AHL-deficient background
Suitable recipient for AHL detection assays
Plasmid (pZLR4):
Size: Not specified in literature
Resistance Markers: Confers resistance to gentamicin and beta-lactam antibiotics
Reporter System: Contains an AHL-inducible β-galactosidase (LacZ) gene
Function: Plasmid carries a traG-lacZ fusion that is activated in the presence of exogenous AHL signals
4. Mechanism of Action
When BioVector® NTL4(pZLR4) encounters AHL molecules (specifically medium- to long-chain AHLs), the following occurs:
AHL binds to the TraR regulator protein
TraR-AHL complex activates transcription of the traG-lacZ fusion
β-galactosidase is produced
Enzyme activity can be detected using chromogenic substrates (e.g., X-gal) producing blue color, or quantified via enzymatic assays
5. Growth and Culture Conditions
Recommended Medium: BioVector® ATCC Medium 1885 (or BioVector® LB-Miller medium supplemented appropriately)
Temperature: 28°C
Atmosphere: Aerobic
Antibiotic Selection: Supplement media with 25 μg/mL gentamicin to ensure plasmid retention
Growth Time: 48 hours for colony formation
6. Handling and Storage
Product Format: Freeze-dried
Storage Conditions:
Freeze-dried: 2°C to 8°C
Frozen stocks: -80°C or colder
Revival Procedure:
Rehydrate pellet with 0.5-1.0 mL of BioVector® #1885 broth
Transfer back to 5-6 mL broth tube
Mix well and inoculate additional tubes, slants, or plates
Incubate at 28°C for 48 hours
7. Quality Control
Verification: Whole-genome sequencing verified
Genome Size: 5,483,803 bp
GC Content: 59.12%
Sterility: Negative for contaminants
8. Applications
Quorum Sensing Research: Detection and characterization of AHL signals from various bacteria
Screening AHL-Producing Bacteria: Identification of strains producing medium- to long-chain AHLs
Quorum Quenching Studies: Evaluating AHL degradation by potential quorum-quenching enzymes or compounds
Biofilm Research: Studying the role of AHL signals in biofilm formation
Environmental Monitoring: Detection of AHL signals in environmental samples
BioVector® NTL4(pZLR4) 菌株说明书
中文版本
1. 菌株概述
菌株名称: BioVector® NTL4(pZLR4)
ATCC编号: BAA-2240™
物种:Agrobacterium fabrum(原名 Agrobacterium tumefaciens、Rhizobium radiobacter)
模式菌株: 否
生物安全等级: BSL-1
构建年份: 1996年
保藏者: S. Farrand,伊利诺伊大学
基因组测序: 已完成(ATCC基因组门户)
2. 描述与应用
BioVector® NTL4(pZLR4) 是通过将重组质粒 pZLR4 转化至 Agrobacterium fabrum NTL4 菌株中获得的重组细菌菌株。该菌株经专门设计,可用作 检测 N-酰基高丝氨酸内酯(AHL)群体感应信号的生物报告菌。
该菌株可检测 中长链 AHLs,包括:
C6-AHL、C10-AHL、C12-AHL、C14-AHL
C6-3-羟基-AHL、C8-3-羟基-AHL、C10-3-羟基-AHL
所有 3-氧代-AHLs(例如 3OC6、3OC8、3OC10、3OC12、3OC14)
3. 遗传特征
宿主菌株(NTL4):
源自 Agrobacterium fabrum(原名 A. tumefaciens)
AHL 缺陷型背景
适用于 AHL 检测实验的受体菌
质粒(pZLR4):
大小: 文献中未具体说明
抗性标记: 赋予 庆大霉素 和 β-内酰胺类抗生素 抗性
报告系统: 包含 AHL 诱导型 β-半乳糖苷酶(LacZ) 基因
功能: 质粒携带 traG-lacZ 融合基因,在遇到外源 AHL 信号时被激活
4. 作用机制
当 BioVector® NTL4(pZLR4) 遇到 AHL 分子(特别是中长链 AHLs)时,发生以下过程:
AHL 与 TraR 调节蛋白结合
TraR-AHL 复合物激活 traG-lacZ 融合基因的转录
产生 β-半乳糖苷酶
可使用显色底物(如 X-gal)检测酶活性,产生蓝色,或通过酶学实验进行定量检测
5. 生长与培养条件
推荐培养基: BioVector® ATCC Medium 1885(或适当补充的 BioVector® LB-Miller 培养基)
温度: 28°C
需氧条件: 需氧
抗生素筛选: 培养基中添加 25 μg/mL 庆大霉素 以确保质粒保持
生长时间: 菌落形成需 48 小时
6. 处理与储存
产品形式: 冻干粉
储存条件:
冻干粉:2°C 至 8°C
冷冻保存:-80°C 或更低温度
复苏步骤:
用 0.5-1.0 mL BioVector® #1885 肉汤重新水化沉淀
转移回 5-6 mL 肉汤管中
充分混匀,接种额外的肉汤管、斜面或平板
28°C 培养 48 小时
7. 质量控制
验证: 经全基因组测序验证
基因组大小: 5,483,803 bp
GC含量: 59.12%
无菌检测: 无污染物
8. 应用
群体感应研究: 检测和表征各种细菌产生的 AHL 信号
筛选 AHL 产生菌: 鉴定产生中长链 AHL 的菌株
群体淬灭研究: 评估潜在群体淬灭酶或化合物对 AHL 的降解作用
生物膜研究: 研究 AHL 信号在生物膜形成中的作用
环境监测: 检测环境样品中的 AHL 信号
BioVector NTCC质粒载体菌株细胞蛋白抗体基因保藏中心
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