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Prokaryotic Transcription Mechanisms and Regulation Study Guide

This guide covers the fundamental mechanisms of eukaryotic transcription, including the functions of different RNA polymerases, the initiation complex, elongation, and termination. It also delves into co-transcriptional RNA processing events such as capping, splicing, and polyadenylation, as well as enhancer-driven gene regulation and DNA looping. The guide provides a comprehensive overview of how genes are transcribed and their transcripts are processed in eukaryotic cells.

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Mechanisms of Transcription, Translation, and RNA Processing

Molecular Genetics RNA Processing Mechanisms

Major RNA processing events include 5' caps such as 7-methylGuanosine and non-canonical caps like NAD and FAD, as well as cotranscriptional splicing.

  • RNA processing
  • 5' Caps
  • 7-methylGuanosine
  • Non-canonical caps
  • FAD
  • Cotranscriptional splicing
  • Introns
  • Eukaryotic gene organization

Prokaryotic Transcription Mechanisms and Regulation

An overview of transcription in prokaryotes involving RNA polymerase, sigma factors, Nus factors, and Rho-dependent or Rho-independent termination.

  • RNA polymerase subunits
  • Transcription initiation
  • Sigma factors
  • Promoter elements
  • Transcription elongation
  • GreA/B factors
  • Nus factors
  • Rho-independent termination
  • Rut site
  • Nut site
  • DNA supercoiling
  • Topoisomerase

Molecular Genetics and Protein Synthesis

Translation with a ribosome makes a polypeptide from amino acid monomers through the final stage of the central dogma.

  • central dogma
  • translation
  • polypeptide
  • amino acid anatomy
  • primary structure
  • secondary structure
  • tertiary structure
  • quaternary structure
  • protein folding
  • ribosomes

Mechanisms of Protein Synthesis and Translation

This study guide details the processes of tRNA charging, codon-anticodon pairing, and the initiation, elongation, and termination stages of translation in prokaryotes and eukaryotes.

  • tRNA charging
  • Aminoacyl tRNA synthetases
  • Anticodon and codon pairing
  • Wobble base-pairing rules
  • Translation initiation
  • Kozak sequence
  • Internal ribosome entry site (IRES)
  • Translation elongation
  • Translation termination
  • Release factors
  • Coupled transcription and translation
  • Polycistronic mRNA

Regulation and Surveillance of mRNA Translation

Regulatory sRNAs control translation through direct inhibition and indirect activation, while mRNA surveillance pathways like nonsense mediated decay, nonstop decay, and no go decay manage improper translation.

  • Indirect translation activation
  • Direct translation initiation
  • Protein sequestration
  • Nonsense mediated decay (NMD)
  • Nonstop decay (NSD)
  • tmRNA
  • No go decay (NGD)
  • Ribosome stalling

Mechanisms of RNA Regulation and Gene Expression

Mechanisms of RNA Splicing and Gene Expression

This study guide illustrates gene expression through the mechanisms of RNA splicing, including intron excision, spliceosome assembly, and nuclear export.

  • RNA splicing
  • Intron excision
  • Lariat formation
  • Spliceosome
  • 5' splice site
  • 3' splice site
  • Group I introns
  • Group II introns
  • snRNPs
  • E complex
  • A complex
  • Intron definition
  • Exon definition
  • Nonsense mediated decay

Structure and Composition of Ribosomes

Ribosomes are composed of large and small subunits containing rRNA and helper proteins that determine protein abundance.

  • Ribosome subunits
  • Prokaryotic ribosome
  • Eukaryotic ribosome
  • Organellar ribosomes
  • Nucleolus
  • Rough endoplasmic reticulum
  • Transfer RNA (tRNA)
  • Post-transcriptional base modification

RNA Localization and Stability Regulation

Post transcriptional RNA regulation involves mechanisms such as RNA localization, half-life variation, and degradation by ribonucleases.

  • Post transcriptional RNA regulation
  • RNA half-life
  • RNA localization
  • RNA stability
  • Poly A tails
  • Hairpins
  • piRNA
  • Nonsense-mediated decay
  • No go decay
  • RNA-binding proteins
  • Regulons
  • Ribonucleases
  • RNA Exonucleases
  • RNA Endonuclease
  • Deadenylation-dependent degradation pathways
  • 5' caps
  • Long non-coding RNAs

mRNA Localization and Cellular Processes

Mechanisms of mRNA degradation, asymmetric cell division, and intracellular localization through RNA-binding proteins and molecular motors.

  • No go decay
  • Xrn1 and Cue2 exonucleases
  • Asymmetric cell division
  • Pattern formation and differentiation
  • Xenopus egg polarization
  • Ash1 mRNA shuttle
  • Compartmentalization
  • Sequestration by granule formation
  • Phase transition
  • Intracellular localization
  • RNA-binding proteins
  • Molecular motors
  • Cytoskeleton transport
  • Localized protection from degradation
  • Localized anchoring
  • Intercellular RNA transport
  • Extracellular vesicles

Eukaryotic Transcription and RNA Processing Mechanisms

Mechanisms of RNA Splicing and Editing

This study guide covers alternative splicing regulation, sex determination in Drosophila, trans-splicing, polyadenylation, and RNA editing processes.

  • Alternative splicing
  • Splicing enhancers and silencers
  • Sex determination in Drosophila
  • Sxl expression
  • Transformer (Tra) gene
  • Doublesex (Dsx) regulator
  • Trans-splicing
  • Spliced leaders (SL)
  • Polyadenylation
  • Poly A tail
  • Ribozymes
  • RNA editing
  • Adenosine to Inosine editing
  • APOB gene editing

Eukaryotic Transcription and RNA Polymerase Complexes

This study guide covers eukaryotic transcription involving three RNA polymerase enzyme complexes, general transcription factors, and the assembly of the pre-initiation complex.

  • RNA polymerase I
  • RNA polymerase II
  • RNA polymerase III
  • General transcription factors (GTFs)
  • Pre-initiation complex (PIC)
  • TATA-binding protein (TBP)
  • Promoter sequences
  • TATA box
  • Mediator complex
  • Transcription elongation
  • Promoter clearance
  • Enhancer and repressor elements

Enhancer Driven Gene Regulation Mechanisms

This study guide illustrates how enhancers interact with promoters through DNA looping to regulate gene transcription via transcription factors, mediator complexes, and RNA polymerase II.

  • Enhancer-driven gene regulation
  • Transcriptional regulation
  • Cis and trans configurations
  • DNA looping
  • Transcription factors
  • General Transcription Factors (GTFs)
  • Mediator complex
  • RNA polymerase II (RNAPII)
  • Repressors
  • Enhancer RNAs
  • Cohesion and CTCF

Eukaryotic RNA Polymerase Transcription Mechanisms

RNA polymerase I, II, and III undergo distinct processes of initiation, elongation, and termination to regulate gene expression and mRNA processing.

  • RNA polymerase II phosphorylation
  • C-terminal domain (CTD) regulation
  • Co-transcriptional processing
  • 5' capping
  • Splicing and intron removal
  • Polyadenylation and termination
  • RNA polymerase I ribosomal RNA synthesis
  • Nucleolus function
  • RNA polymerase III tRNA transcription
  • Intrinsic termination

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