Gene Expression and Regulation

These flashcards cover key concepts related to gene expression, regulation, and the roles of various proteins and DNA sequences involved in transcription.

Gene Expression

The process by which information from a gene is used to synthesize a functional gene product, typically proteins.

Eukaryotic Transcription Factors

Proteins that bind to specific DNA sequences to initiate and regulate the transcription of genes.

Promoter Region

A specific sequence of DNA that defines where the transcription of a gene by RNA polymerase begins.

RNA Polymerase II

An enzyme responsible for synthesizing mRNA in eukaryotic cells.

Transcriptional Control

Regulation of gene expression at the stage of transcription, affecting how much mRNA is produced.

Repressor Proteins

Proteins that inhibit gene transcription by binding to the operator or promoter region.

Enhancers

DNA sequences that enhance the transcription of a gene, often located far from the promoter.

Mediator

A multi-protein complex that coordinates the interaction between transcription factors and RNA polymerase.

Silencer

A DNA sequence that can repress transcription when bound by repressor proteins.

Transcription Regulator Dimer

A protein complex that binds to DNA to regulate gene transcription, often formed by two identical or different proteins.

Leucine Zipper

A motif in some transcription factors that facilitates dimerization and binding to DNA.

Zinc Finger

A protein structural motif that can bind to DNA, characterized by one or more zinc ions stabilizing the fold.

Major Groove

The wider of the two grooves in the DNA double helix, where protein interactions can occur.

Minor Groove

The narrower of the two grooves in the DNA double helix, also a site for protein interactions.

Transcriptional Regulators

Proteins that influence the transcription of specific genes by binding to nearby DNA.