Promoter Terminator Addition
Promoter Terminator Addition - Related Videos
01:44
Termination of Translation
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2020
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
01:27
Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)
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2025
α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition. Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon. Direct addition products are formed faster owing to...
02:40
The Eukaryotic Promoter Region
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2020
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
01:08
Conjugate Addition of Enolates: Michael Addition
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2023
The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions. The reaction is catalyzed by a base that abstracts the acidic methylene hydrogen, generating a doubly-stabilized enolate ion that serves as the nucleophile or the Michael donor. The base employed depends on the...
10:58
Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
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Cited by 15 •
2017
Promoter expression analyses are crucial to improving the understanding of gene regulation and the spatiotemporal expression of target genes. Herein we present a protocol to identify, isolate, and clone a plant promoter. Further, we describe the characterization of the nodule-specific promoter in the common bean hairy roots.
FAQs
The promoter provides the recruitment site for transcription machinery, so its placement establishes the starting point for RNA synthesis relative to the gene. This positioning helps connect the intended regulatory sequence with the gene being studied and supports more predictable expression from an engineered DNA construct. The result is greater control over which gene is transcribed.
The terminator helps define the end of the RNA transcript and limits transcriptional read-through into neighboring sequences. That boundary is important when an engineered construct contains multiple genetic elements or is introduced into a host cell, because unintended continuation could affect nearby sequences. Including the terminator therefore supports cleaner, more controlled expression-unit behavior.
Used together, the two regulatory boundaries frame a gene as a defined expression unit: one specifies where RNA synthesis begins, and the other specifies where it ends. This coordinated arrangement supports controlled and reproducible outputs in synthetic genetic systems. It also gives researchers a way to distinguish intended transcription from activity that extends beyond the engineered unit.
Researchers place the regulatory DNA sequences around the gene of interest, using the promoter to establish the transcription start and the terminator to establish the endpoint. In practice, the construct is designed as a bounded expression unit and may be carried on a plasmid for use in host cells. The design goal is predictable gene expression rather than uncontrolled transcription.
It is useful when experiments require controlled expression from an engineered gene. The approach supports studies of gene regulation, recombinant protein production, and synthetic genetic systems. In each setting, the surrounding regulatory sequences help researchers interpret the intended transcriptional output and seek reproducible behavior from the construct, rather than treating RNA production as an undefined or unrestricted process.
Researchers can examine whether the construct produces a defined RNA transcript, whether expression follows the intended regulatory design, and whether transcription remains bounded near neighboring sequences. These outcomes connect molecular design with experimental interpretation: successful control is reflected in predictable and reproducible expression. The same criteria are relevant when plasmids or other engineered DNA constructs are tested in host cells.