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Related Concept Videos

Immunoprecipitation01:20

Immunoprecipitation

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Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
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Steps in Outbreak Investigation01:18

Steps in Outbreak Investigation

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In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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Steps in the Modeling Process01:14

Steps in the Modeling Process

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Albert Bandura's theory of observational learning identifies four critical processes: attention, retention, motor reproduction, and reinforcement or motivation.
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Steps for Free-Body Diagram01:22

Steps for Free-Body Diagram

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When it comes to studying the behavior of objects in mechanics, one of the most important tools available is the free-body diagram. Consider a simple example of a system of two blocks coupled by a massless string over a frictionless pulley. Block 1 is sliding over a table pulled by block 2 as block 2 falls under gravity.
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Related Experiment Video

Updated: Feb 3, 2026

Methylated DNA Immunoprecipitation
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Methylated DNA Immunoprecipitation

Published on: January 2, 2009

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Two-Step Co-Immunoprecipitation (TIP).

Maria Rita Sciuto1, Valeria Coppola1, Gioacchin Iannolo2

  • 1Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy.

Current Protocols in Molecular Biology
|October 31, 2018
PubMed
Summary
This summary is machine-generated.

A new two-step co-immunoprecipitation (TIP) method enhances specificity for isolating protein-protein and protein-nucleic acid interactions (PPIs and PNIs). This technique reduces nonspecific binders, improving downstream analysis of molecular complexes.

Keywords:
antibodyco-immunoprecipitationprotein-nucleic acid interactionprotein-protein interaction

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Investigating protein-protein interactions (PPIs) and protein-nucleic acid interactions (PNIs) is crucial in molecular biology.
  • Co-immunoprecipitation (co-IP) is a standard method for isolating protein complexes.
  • Existing co-IP methods can suffer from nonspecific binding, complicating analysis.

Purpose of the Study:

  • To introduce and detail a two-step co-immunoprecipitation (TIP) technique.
  • To demonstrate TIP's enhanced specificity for isolating PPIs and PNIs.
  • To showcase TIP's application in purifying protein complexes and transcription-factor-bound chromatin.

Main Methods:

  • Description of a novel two-step co-immunoprecipitation (TIP) protocol.
  • Application of TIP for purifying protein complexes from Burkitt lymphoma and human CD4+ T cells.
  • Utilizing TIP for the isolation of transcription-factor-bound chromatin.

Main Results:

  • TIP significantly increases the specificity of protein-protein and protein-nucleic acid interaction isolation.
  • The method effectively reduces the presence of nonspecific binders in isolated complexes.
  • Successful purification of protein complexes and chromatin-bound factors was achieved under native conditions.

Conclusions:

  • The two-step co-immunoprecipitation (TIP) technique offers superior specificity compared to standard co-IP.
  • TIP facilitates more accurate downstream analyses of macromolecular interactions.
  • This method is valuable for studying protein complexes and chromatin interactions in various cell types.