BioVector® pSLfa-PUb-MCS 植物双元质粒载体

BioVector® pSLfa-PUb-MCS Plant Binary Plasmid Vector

第一部分 中文说明

一 载体基本信息与用途

• 载体名称 BioVector® pSLfa-PUb-MCS

• 载体类型 植物表达质粒载体 / 双元改造中间载体。

• 核心用途 专门用于单子叶植物（如水稻、小麦、玉米）的高效基因转录调控与多基因表达元件盒的组装。

• 抗性标记

  • 大肠杆菌及农杆菌筛选 氨苄青霉素抗性（Ampicillin，AmpR）或特定的广宿主抗性（根据骨架衍生有所不同，通常包含多克隆位点侧翼侧选择性标志）。

  • 植物转化筛选 根据插入的表达盒可与含有潮霉素（Hygromycin）或除草剂（Basta）抗性的主双元载体联合使用。

• 常用宿主菌 大肠杆菌 DH5a、Top10 以及农杆菌 EHA105、LBA4404。

二 关键结构域与元件配置

• 强启动子（PUb / Polyubiquitin Promoter）：含有来自单子叶植物的多聚泛素强启动子（通常为水稻 Rubi / Rice Polyubiquitin 或玉米 Ubi-1 启动子）。该启动子在单子叶植物的所有组织中均具有极高的全株组成型、高强度表达活性，其表达效率显著高于传统的双子叶植物花椰菜花叶病毒 35S 启动子。

• 内含子（Intron）：在 PUb 启动子下游紧邻一个优化的植物内含子序列。该结构能通过内含子介导的表达增强机制（IME, Intron-Mediated Enhancement），大幅提升目标 mRNA 在植物细胞核内的加工效率与出核稳定性，进而显著提高蛋白质的最终翻译量。

• 多克隆位点（MCS）：搭载了经过优化的多克隆位点，便于平滑插入目标目的基因。

• 独特侧翼限制性酶切位点（fa / Rare cutters）：整个表达盒的两端（即启动子上游和终止子下游）被两组极为罕见的稀有内含子限制性内切酶位点（如 SfiI 或 fa 核心识别序列）所包裹。

  • 核心优势：利用这组稀有酶切位点，科研人员可以非常方便地将整个完整的“PUb-内含子-MCS-终止子”表达盒整体切下，直接无缝克隆拼接到大型植物双元表达载体（如 pCAMBIA 系列、pYLT 系列）中，极大地简化了多基因串联（Multigene stacking）多产物代谢途径的分子克隆难度。

三 标准分子克隆与转化操作步骤

1. 目的基因插入 选用多克隆位点 MCS 中的合适酶切位点，对 BioVector® pSLfa-PUb-MCS 载体和 PCR 扩增的目的基因片段进行双酶切，经 T4 DNA 连接酶连接后转化大肠杆菌 DH5a。

2. 阳性克隆鉴定 利用通用引物或目的基因特异性引物进行菌落 PCR 筛选，并提取质粒进行酶切质控与测序验证。

3. 表达盒整体转移 使用 SfiI 等稀有内含子酶切整段表达盒，随后将其连接到最终用于植物转化的目标双元载体中。

4. 农杆菌转化与转化植物 将构建好的最终双元载体通过电转化或冻融法导入农杆菌中，利用农杆菌介导的遗传转化法（如水稻愈伤组织转化、玉米幼胚转化）侵染宿主植物，通过相应的抗生素进行阳性植株筛选。

四 核心科研应用方向

1. 单子叶植物基因功能验证与过表达（Overexpression）：作为高效率的单子叶专用过表达载体系统，用于创制高表达特定功能基因的转基因水稻、玉米，从而深入解析逆境胁迫、产量性状、激素信号转导等分子机理。

2. 多基因堆叠与多酶代谢途径重构：利用其特殊的侧翼稀有酶切位点（fa结构），可并行构建多个带有不同目的基因的 pSLfa-PUb-MCS 衍生载体，再通过步移法或模块化拼接，将多个独立表达盒串联到同一个 T-DNA 区段内，用于植物生物反应器或复合性状的分子育种。

3. 基因编辑（CRISPR/Cas9）辅助骨架：用于高强度、高稳定性地驱动 Cas9 核酸酶、碱基编辑器（Base Editors）或引导编辑器（Prime Editors）在单子叶植物中的表达，以提高精准编辑的综合效率。

PART 2 ENGLISH SECTION

I General Information and Applications

• Vector Name BioVector® pSLfa-PUb-MCS

• Vector Type Plant Expression Vector / Binary Shuttle Vector System.

• Primary Application Specifically engineered for highly efficient gene transcription regulation and multigene expression cassette stacking in monocotyledonous plants such as rice, wheat, and maize.

• Selection Markers

  • Bacterial Selection Ampicillin resistance (AmpR) for cloning propagation in E. coli or Agrobacterium.

  • Plant Selection Designed to be shuttled into ultimate destination binary vectors containing Hygromycin B or Basta resistance genes for transgenic plant tissue selection.

• Common Host Strains E. coli DH5a, Top10, and Agrobacterium tumefaciens strains EHA105 or LBA4404.

II Vector Anatomy and Component Configuration

• Strong Ubiquitin Promoter (PUb): Outfitted with a monocot-derived polyubiquitin promoter (such as the rice Rubi or maize Ubi-1 promoter). This element drives constitutive, high-level broad-spectrum expression across nearly all plant tissues, demonstrating vastly superior transcript yields in monocots compared to the standard dicot-preferred CaMV 35S promoter.

• Intron Sequence: Includes a specialized, optimized plant intron located directly downstream of the PUb promoter. This element recruits the host cell splicing machinery to engage Intron-Mediated Enhancement (IME), drastically upgrading mRNA stability, nucleocytoplasmic export, and ultimate protein translation efficiency.

• Multiple Cloning Site (MCS): Features a dense arrangement of unique restriction endonuclease sites tailored for the clean insertion of target open reading frames.

• Flanking Rare Restriction Sites (fa / Rare Cutters): The entire expression cassette boundaries (upstream of the promoter and downstream of the terminator) are explicitly flanked by rare-cutting restriction sites, such as SfiI or corresponding fa-flanking recognition elements.

  • Core Technical Advantage: This layout permits researchers to easily excise the complete, intact "PUb-Intron-MCS-Terminator" block as a single piece. The cassette can then be directly mobilized into complex multi-gene destination binary vectors (e.g., pCAMBIA-based backbones) without undergoing tedious internal sequence adjustments, making it an excellent module for metabolic pathway engineering and multi-gene stacking.

III Subcloning and Plant Transformation Workflow

1. Insertion of Target Gene Digest both the BioVector® pSLfa-PUb-MCS vector and the target amplicon using complementary restriction sites selected from the MCS. Ligate using T4 DNA Ligase and transform into electrocompetent or chemically competent E. coli DH5a cells.

2. Clonal Verification Identify positive clones via colony PCR and confirm accuracy through plasmid diagnostic restriction digests and sequencing runs.

3. Cassette Shuttling Subclone the entire integrated expression module via rare cutters like SfiI into the final T-DNA binary carrier.

4. Agrobacterium-Mediated Transformation Introduce the verified binary vector into Agrobacterium tumefaciens via electroporation or the freeze-thaw method. Use the engineered strain to infect plant targets (e.g., embryonic rice calli or immature maize embryos), selecting for positive transgenic events with appropriate selection agents.

IV Strategic Research Applications

1. Monocot Functional Genomics & Overexpression Profiling: Serves as a premier vector to generate stable, high-expressing transgenic monocot lines, driving investigations into drought tolerance, disease resistance, crop yields, and phytohormone signal networks.

2. Multi-Gene Metabolic Pathway Reconstitution: Leverages the rare-cutting flanking elements to construct independent gene modules simultaneously. Multiple cassettes can be easily arrayed onto a single T-DNA strand to orchestrate multi-step enzyme networks or stack multi-genic agronomic traits in molecular breeding.

3. CRISPR/Cas9 Toolkit Engineering: Routinely deployed to drive uniform, high-level expression of Cas9 endonucleases, base editors, or prime editing machinery inside monocot systems, elevating overall target site editing efficiencies.

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