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Chapter 14: Problem 18

Why is an alteration of electrophoretic mobility interpreted as a change in the primary structure of the protein under study?

Short Answer

Expert verified
Answer: An alteration in electrophoretic mobility is interpreted as a change in the primary structure of a protein because it indicates a potential change in the protein's size, shape, and/or charge, which are determined by its amino acid sequence. These changes can impact the protein's function, interactions with other molecules, and overall stability. By studying shifts in electrophoretic mobility, researchers can identify and characterize potential functional alterations within a protein as a result of changes in its primary structure.

Step by step solution

01

Introduction to Electrophoresis

Electrophoresis is a technique used to separate charged molecules, such as proteins and nucleic acids, based on their size and charge. It involves applying an electric field across a gel matrix, causing the molecules to migrate through the matrix at different rates depending on their individual properties.
02

Protein Structure

Proteins are made up of a sequence of amino acids, with each amino acid having a unique side chain. The primary structure of a protein refers to the linear sequence of amino acids in the polypeptide chain. This sequence determines the overall shape and function of a protein.
03

Role of primary structure in electrophoretic mobility

The electrophoretic mobility of a protein is determined by its size, shape, and charge. The primary structure affects all three of these characteristics. The size and shape of a protein are determined by the amino acid sequence, which dictates the length of the polypeptide chain and how it folds. The charge of a protein is influenced by the relative proportion of charged amino acids in the primary structure. Therefore, a change in the primary structure of a protein will likely result in a change in electrophoretic mobility.
04

Interpreting changes in electrophoretic mobility

Alteration of electrophoretic mobility is interpreted as a change in the primary structure of the protein because it indicates a potential change in size, shape, and/or charge of the protein. Such changes can impact the protein's function, interactions with other molecules, and overall stability. By studying shifts in electrophoretic mobility, researchers can identify and characterize potential functional alterations within a protein as a result of changes in its primary structure.

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Most popular questions from this chapter

Review the Chapter Concepts list on \(\mathrm{p} .371 .\) These all relate to the translation of genetic information stored in mRNA into proteins and how chemical information in proteins impart function to those molecules. Write a brief essay that discusses the role of ribosomes in the process of translation as it relates to these concepts.

Contrast the roles of tRNA and mRNA during translation and list all enzymes that participate in the transcription and translation process.

The synthesis of flower pigments is known to be dependent on enzymatically controlled biosynthetic pathways. For the crosses shown here, postulate the role of mutant genes and their products in producing the observed phenotypes: (a) \(P_{1}:\) white strain \(A \times\) white strain \(B\) \(\mathrm{F}_{1}:\) all purple \(\mathrm{F}_{2}: 9 / 16\) purple: \(7 / 16\) white (b) \(P_{1}:\) white \(\times\) pink \(\mathrm{F}_{1}:\) all purple \(\mathrm{F}_{2}: 9 / 16\) purple: \(3 / 16\) pink: \(4 / 16\) white

Assuming that an amino acid sequence is 250 amino acids long, how many different molecules, each with a unique sequence, could be formed?

Three independently assorting genes are known to control the following biochemical pathway that provides the basis for flower color in a hypothetical plant: Colorless \(\stackrel{A^{-}}{\longrightarrow}\) yellow \(\stackrel{B^{-}}{\longrightarrow}\) green \(\stackrel{C-}{\longrightarrow}\) speckled Three homozygous recessive mutations are also known, each of which interrupts a different one of these steps. Determine the phenotypic results in the \(\mathrm{F}_{1}\) and \(\mathrm{F}_{2}\) generations resulting from the \(P_{1}\) crosses of true-breeding plants listed here: (a) speckled \((A A B B C C) \times\) yellow \((A A b b C C)\) (b) yellow \((A A b b C C) \times \operatorname{green}(A A B B c c)\) (c) colorless \((a a B B C C) \times\) green \((A A B B c c)\)
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