BioVector® 维氏弧菌 Vmax™ 高速生长表达菌株

BioVector® Vibrio natriegens Vmax™ Hyper-Growth Expression Strain

第一部分 中文说明

一 产品基本信息与遗传学背景

• 菌株名称：Vibrio natriegens Vmax™

• 物种来源：维氏弧菌 (Vibrio natriegens)

• 野生型背景与人工改良：

  • 天然超能力：野生型维氏弧菌是一种分离自盐沼环境的非致病性海洋细菌。它是目前地球上已知倍增速度最快的自由生活生物。

  • Vmax™ 改良特征：Vmax™ 是通过对野生型菌株进行精准的基因组工程与代谢通路重塑而获得的重组蛋白/质粒高通量表达专用工程菌株。研发人员对其内源性限制修饰系统进行了灭活（敲除了特定的核酸酶基因，如类似于大肠杆菌 endA 和 hsdR 的功能位点），使其能够直接高效稳定地容纳外源 DNA，极大地提高了转化效率。此外，还集成引入了受异丙基硫代半乳糖苷（IPTG）严格调控的 T7 RNA 聚合酶转录系统，使其能够完美兼容现有的 T7 启动子表达载体（如 pET 系列质粒）。

• 生物安全级别：1级（BSL-1）。该菌株对人类、动物及植物均无致病性。

二 核心生物学优势与突破性生长动力学

Vmax™ 菌株的设计旨在全面颠覆并取代传统大肠杆菌（E. coli）在现代分子生物学克隆和蛋白质表达中的统治地位，其核心技术参数如下：

1. 极端极速的倍增时间（Unparalleled Growth Kinetics）：

   • 在优化的专用富集培养基（如 Vmax™ Optimized Medium）中，Vmax™ 处于对数生长期的群体群体倍增时间（Doubling Time）仅为 7 至 10 分钟。这比传统大肠杆菌快了近一倍。

   • 极速的生长使得原本在 E. coli 中需要孵育过夜（16小时）的平板单菌落长成或液体摇瓶扩增，在 Vmax™ 中仅需 4 至 6 小时即可完全达到相同的生物量饱和点。

2. 超高密度的生物量与质粒/蛋白高产丰度：

   • 相同培养体积下，Vmax™ 能够达到的最终细胞密度（OD600）通常是大肠杆菌的 2 至 3 倍。这意味着单瓶摇瓶培养即可获得极高丰度的细胞沉淀。

   • 由于其细胞内具有极高密度的核糖体和极快的翻译延伸速率，目标重组蛋白的单细胞产率和总表达量大幅增加，且质粒提取的终产量也显著高于大肠杆菌。

3. 高丰度可溶性表达（Improved Solubility）：

   • Vmax™ 具有截然不同于大肠杆菌的胞内渗透压环境和天然分子伴侣系统。许多在大肠杆菌中极易形成不溶性包涵体（Inclusion Bodies）的顽固蛋白，在 Vmax™ 胞内往往能以高丰度、活性可溶（Soluble）的状态正确折叠表达。

三 培养基配置、转化、扩增与诱导标准操作步骤

1. 专用培养基配方（至关重要，严禁直接使用标准 LB 培养基）：

   • 维氏弧菌作为一种海洋衍生菌，其生长和维持对钠离子（$Na^+$）及特定的渗透压平衡有强制性要求。在标准大肠杆菌 LB 培养基中由于缺乏足够的盐分，Vmax™ 将完全无法生长甚至会自发裂解。

   • BioVector® Vmax™ 专用优化培养基（Vmax™ Optimized Medium / vLB）：

     • 10 g 胰蛋白胨 (Tryptone)

     • 5 g 酵母提取物 (Yeast Extract)

     • 15 g 至 20 g 氯化钠 (NaCl) （工作总浓度约为 1.5% - 2%，是大肠杆菌常规 LB 盐浓度的 3 到 4 倍）。

     • 补充添加（可选，用于最大化对数期生长）：0.4% $\text{v/v}$ 甘油、4.2 g/L $MgCl_2 \cdot 6H_2O$。pH 值精密调整至 7.5。

2. 质粒转化（Transformation）：

   • 感受态细胞准备：使用 BioVector® 专用的低盐/高渗透压洗涤缓冲液（含蔗糖及镁盐）制备 Vmax™ 电转或化学感受态细胞。

   • 转化操作：由于已敲除内源 DNA 降解屏障，可直接将 pET 系列、pUC 系列或其它大肠杆菌常用质粒直接加入感受态中。执行标准热激法（42°C，45秒）或电击法。

   • 复苏铺板：热激后加入 1 ml 预热的 vLB 液体培养基，在 37 摄氏度下仅需复苏 30 分钟。随后涂布于含有对应抗生素的高盐 vLB 固体平板上。置于 37 摄氏度温育，4 至 5 小时后即可直接用肉眼观察并挑选清晰的单菌落，无需过夜等待。

3. 高通量蛋白表达与 IPTG 诱导（Protein Induction）：

   • 种子液扩增：从 vLB 平板上挑取单菌落接种入 5 ml vLB 液体中，37°C 振荡培养（250 rpm），仅需约 2 小时其 OD600 即可飙升至对数中期。

   • 放大培养与诱导：按 1比100 转种至大容量 vLB 培养基中。当菌液密度 OD600 极速达到 0.6 至 0.8 时（通常转种后 40-60 分钟内即可达到），立即加入终浓度为 0.1 mM 至 0.5 mM 的 IPTG。

   • 收获时段：诱导开启后，由于其超高的翻译效率，通常在 30 摄氏度下诱导 2 至 4 小时，或在 37 摄氏度下诱导 1 至 2 小时，目标重组蛋白的胞内积累量即可达峰。此时即可离心收集菌体沉淀进行后续的蛋白纯化。

四 核心科研与工业应用方向

1. 全流程科研周期的断崖式缩短（Ultra-Fast Molecular Cloning）：Vmax™ 允许实验人员在单个工作日内连续完成“质粒转化 $\rightarrow$ 菌落生长 $\rightarrow$ 液体扩增 $\rightarrow$ 质粒提取/蛋白诱导”的全套完整流程，彻底终结了分子生物学中依赖“隔夜孵育”的传统工作模式。

2. 顽固蛋白/功能酶类的可溶性高表达开发：利用其天然具有的海洋高效折叠微环境，专门解决结构复杂、构象多变、在 E. coli 中极易发生由于翻译速度失衡而堆积成包涵体的问题，是生产高活性工业酶、治疗性单链抗体（scFv）及难表达细胞因子的理想宿主。

3. 自动化高通量药物筛选与合成生物学文库构建：在制药工业和基因组学库筛选中，Vmax™ 极短的生长周期与自动化液体工作站（Robotic Liquid Handlers）完美契合。能够在几小时内批量完成成千上万个突变体克隆的重组表达和初步活性评测，大幅度加速了定向进化（Directed Evolution）和药物靶点筛选的工作矩阵。

PART 2 ENGLISH SECTION

I General Information and Genetic Background

• Strain Name: Vibrio natriegens Vmax™

• Species Origin: Vibrio natriegens

• Wild-type Background & Engineering Modifications:

  • Natural Superpower: Wild-type Vibrio natriegens is a non-pathogenic marine bacterium originally isolated from salt-marsh ecosystems. It is recognized as the fastest-growing free-living organism documented on Earth.

  • Vmax™ Engineered Blueprint: The Vmax™ strain is a premium derivative specifically re-engineered via comprehensive genomic editing and metabolic flux redirection to serve as an ultra-high-throughput host for recombinant protein and plasmid manufacturing. Molecular developers successfully deactivated its endogenous restriction-modification systems (knocking out critical endonuclease genes equivalent to E. coli's endA and hsdR loci) to permit stable, high-efficiency uptake of foreign DNA. Furthermore, an Isopropyl $\beta$-D-1-thiogalactopyranoside (IPTG)-inducible T7 RNA Polymerase expression cassette has been integrated into its chromosome, delivering seamless compatibility with mainstream T7-promoter vectors (e.g., pET plasmid series).

• Biosafety Level: BSL-1. Totally non-pathogenic to humans, animals, or agricultural plants.

II Core Bioprocess Advantages & Breakthrough Growth Kinetics

The Vmax™ host is custom-tailored to subvert and upgrade conventional Escherichia coli regimes in recombinant prototyping. Its technical performance parameters are detailed below:

1. Hyper-Accelerated Generation Times:

   • When cultivated inside optimized specialized media setups (e.g., Vmax™ Optimized Medium), Vmax™ achieves a logarithmic population doubling time of just 7 to 10 minutes, essentially cutting the generation cycle of standard E. coli in half.

   • This growth profile transforms multi-step molecular biology pathways. Routine procedures like single-colony plate cultivation or liquid culture amplification—which natively require a 16-hour overnight incubation in E. coli—reach full biomass saturation within 4 to 6 hours in Vmax™.

2. Superior Biomass Densities & High Extraction Yields:

   • Vmax™ routinely accumulates a final cell density (OD600) 2- to 3-fold higher than standard E. coli under identical culture volume conditions, delivering exceptional wet pellet mass from small-scale shake flasks.

   • Supported by high intracellular ribosome density and accelerated translation elongation velocities, it provides both exceptional per-cell recombinant protein expression capacity and high total yields of isolated plasmid DNA.

3. Enhanced Soluble Protein Folding Capabilities:

   • Vmax™ possesses a unique intracellular osmotic matrix and specialized native molecular chaperone machinery distinct from enteric bacteria. Complex, difficult-to-express target proteins that normally aggregate into insoluble inclusion bodies inside E. coli are frequently routed toward high-yield, active, and fully soluble folding pathways within the Vmax™ cytoplasm.

III Media Formulation, Transformation, Expansion, and Protein Induction

1. Specialized Medium Specifications (Crucial Requirement: Do NOT use standard LB broth):

   • Being a marine-derived organism, Vibrio natriegens maintains an obligate structural dependence on sodium ions ($Na^+$) and specific hyper-osmotic balances to stabilize its cell wall. Cultivating Vmax™ in standard E. coli LB formulations will cause absolute growth failure or spontaneous cell lysis due to insufficient salinity.

   • BioVector® Vmax™ Optimized Medium (vLB Formulations):

     • 10 g Tryptone

     • 5 g Yeast Extract

     • 15 g to 20 g Sodium Chloride (NaCl) (Yielding a final salinity matrix around 1.5% - 2.0% $\text{w/v}$, which is 3 to 4 times the salt content of standard E. coli LB recipes).

     • Optional Performance Boosters: 0.4% $\text{v/v}$ Glycerol, 4.2 g/L $MgCl_2 \cdot 6H_2O$. Adjust final pH to a precision metric of 7.5.

2. Plasmid Transformation Regimen:

   • Competent Cell Preparation: Prepare electrocompetent or chemically competent Vmax™ blocks utilizing specialized low-salt, hyper-osmotic washing matrices incorporated with sucrose and magnesium stabilizers.

   • Transformation Protocol: Since endogenous DNA-cleaving barriers are genetically disabled, introduce pET-series, pUC-series, or related standard expression plasmids directly to the competent cell aliquots. Execute standard heat-shock processing (42°C for 45 seconds) or electroporation pulse sequences.

   • Outgrowth Handling: Post-shock, replenish cells immediately with 1 ml of pre-warmed vLB broth. Outgrowth requires only 30 minutes at 37°C. Plate the mixture onto selective vLB agar plates containing the appropriate selection antibiotics. Incubate at 37°C; visible, fully developed single colonies emerge in 4 to 5 hours, bypassing overnight delays.

3. High-Throughput Expression Tuning and IPTG Induction:

   • Starter Inoculation: Inoculate a single colony from the fresh vLB plate into 5 ml of liquid vLB. Shake at 37°C (250 rpm). The culture's OD600 will rapidly enter mid-log phase within approximately 2 hours.

   • Scale-Up and Seeding: Seed the starter culture into larger vLB processing volumes at a 1:100 split configuration. The culture will scale dynamically, hitting the target induction density threshold (OD600 of 0.6 to 0.8) within a brief 40- to 60-minute window post-seeding. Turn on expression by adding IPTG at a final concentration range of 0.1 mM to 0.5 mM.

   • Harvest Timepoint: Driven by intense translation velocities, cellular accumulation of the target protein reaches peak production saturation within 2 to 4 hours of induction at 30°C (or 1 to 2 hours at 37°C). Spin down the slurry to collect the wet cell mass for downstream protein purification workflows.

IV Strategic Research & Industrial Applications

1. Elimination of Overnight Incubation Bottlenecks (Same-Day Cloning workflows): Vmax™ enables scientists to consolidate transformation, colony development, liquid expansion, and plasmid harvesting/protein induction sequences into a single standard 8-hour shift, eliminating the traditional overnight incubation step in molecular biology protocols.

2. Soluble Expression Engineering for Refractory Enzymes: Capitalizes on its marine-derived cytoplasmic folding microenvironment to systematically resolve inclusion body blockades triggered by unbalanced translation rates in E. coli. It acts as a premier system for producing high-activity industrial catalysts, single-chain variable fragments (scFv antibodies), and delicate cellular signaling factors.

3. Automated High-Throughput Screening and Directed Evolution Libraries: Vmax™'s rapid kinetic replication loop integrates seamlessly with robotic liquid-handling workstations in pharmaceutical screening and synthetic biology discovery pipelines. By processing thousands of structural mutant variants through expression and primary activity assays within hours, it significantly accelerates directed evolution screens and therapeutic target discovery.

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