Leucine Zipper Motif

Gene C

. which produce different proteins participating in the stress response.

14.14 Coordinating Gene Expression A single signal,such as drought stress, causes the synthesis of a transcriptional regulator for many genes.

of certain types of genes, both during development and in the adult organism.

Genes can be inactivated by chromatin structure

Other mechanisms that regulate transcription act on the structure of chromatin and chromosomes. As we saw in Chapter 9, chromatin contains a number of proteins as well as DNA. The packaging of DNA into nucleosomes by these nuclear proteins can make DNA physically inaccessible to RNA polymerase and the rest of the transcription apparatus, much as the binding of a repressor to the operator in the prokaryotic lac operon prevents transcription. Chromatin structure at both the local and whole-chromosome levels affects transcription.

Helix-turn-helix motif

Helix-turn-helix motif

Hook Dna Binding Motif
DNA-binding helix Turn Dimer-binding helix These proteins regulate genes involved in development.

Leucine Leucine zipper motif

Leucine Leucine zipper motif

Helix Turn Helix Motif Dna Binding
These proteins regulate cell division genes.

Zinc finger motif

Zinc finger motif

Zinc Finger Listeria Monocytogenes
These proteins are steroid hormone receptors.

Helix-loop-helix motif

Helix-loop-helix motif

Helix Loop Helix Motif

These proteins regulate immune system genes.

14.15 Protein-DNA Interactions The DNA-binding domains of most regulatory proteins have one of these four structural motifs.

These proteins regulate immune system genes.

Was this article helpful?

0 0
Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook


Post a comment