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Related Concept Videos

Protein Denaturation01:28

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...

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Related Experiment Video

Updated: Jun 19, 2026

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
10:55

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts

Published on: November 5, 2012

THE DENATURATION OF EGG ALBUMIN BY ULTRA-VIOLET RADIATION.

J H Clark1

  • 1School of Hygiene and Public Health, Johns Hopkins University, Baltimore.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Ultraviolet radiation causes egg albumin coagulation through light denaturation, a reaction with water, and molecular flocculation. This process is unimolecular and occurs at lower temperatures than heat denaturation.

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Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
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Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs

Published on: January 27, 2021

Related Experiment Videos

Last Updated: Jun 19, 2026

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
10:55

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts

Published on: November 5, 2012

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
06:12

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs

Published on: January 27, 2021

Area of Science:

  • Biochemistry
  • Photochemistry
  • Protein Chemistry

Background:

  • Egg albumin is a common protein used in biochemical studies.
  • Protein denaturation can be induced by various factors, including heat and radiation.
  • Understanding denaturation mechanisms is crucial for protein stability and function.

Purpose of the Study:

  • To elucidate the distinct processes involved in egg albumin coagulation induced by ultraviolet (UV) radiation.
  • To characterize the kinetics and conditions of UV-induced protein denaturation and subsequent reactions.

Main Methods:

  • Isoelectric egg albumin solutions were exposed to ultraviolet radiation.
  • The resulting coagulation processes were analyzed.
  • Kinetic parameters, including reaction order and temperature dependence, were determined.

Main Results:

  • UV radiation induced a three-step coagulation process: light denaturation, reaction with water, and flocculation.
  • Light denaturation followed unimolecular kinetics, independent of temperature and broad in pH range.
  • The reaction between the denatured molecule and water showed a high temperature coefficient and occurred rapidly at 40°C, a temperature ineffective for heat denaturation.

Conclusions:

  • UV radiation offers a distinct pathway for protein denaturation and coagulation at lower temperatures.
  • The findings differentiate UV-induced denaturation from traditional heat denaturation mechanisms.
  • This study provides insights into the photochemistry of proteins and their aggregation behavior.