Bioprocess Engineering Detailed Notes

Bioprocess Engineering Overview

  • Bioprocessing Overview: Fundamental concepts that outline the development of biological platforms.

  • Key Goals: Understanding molecular cloning, the use of restriction enzymes, and PCR in bioprocess development.

Stages of Bioprocess Development

  • General Phases:

    • Upstream processing

    • Downstream processing

Detailed Phases:

  1. Raw Input:

    • Identify raw material and waste material.

    • Explore metabolic pathways and select suitable organisms.

  2. Upstream Processing:

    • Create genetically engineered strains.

    • Optimize growth conditions (e.g., yield, performance).

    • Design genetic components for production.

  3. Downstream Processing:

    • Harvesting and extraction of biomolecules (e.g., proteins, lipids).

    • Purification steps: concentration, chemical refinement, and quality testing.

  4. **Refined Product:

    • Final products include proteins, food products, plastics, fuels, and chemicals.

Molecular Tools and Techniques

Plasmids:

  • Plasmid Structure: Involves:

    • Origin of Replication (ori): Initiates plasmid replication.

    • Marker Genes: Indicate successful transformations (e.g., antibiotic resistance).

    • Reporters: Indicators of gene expression (e.g., lacZ, GFP).

    • Promoters and Terminators: Control gene expression and mRNA stability.

    • Multiple Cloning Sites (MCS): Regions containing recognition sites for restriction enzymes.

Restriction Enzymes

Characteristics:

  • Definition: Enzymes that recognize specific DNA sequences and cleave them, often generating sticky ends.

  • Palindromic Nature: Restriction sites are often palindromic sequences (e.g., "racecar").

Examples of Enzymes:

  • Examples: Ndel, BglII, EcoRI, etc., with corresponding recognition sequences.

  • Naming: The first part of the name usually represents the bacterium from which the enzyme was isolated (e.g., Eco – E. coli).

Comparing Restriction Enzymes and CRISPR

  • **Commonalities:

    • Both are part of bacterial immune systems.

    • Both cut DNA at specific sites.**

  • Differences:

    • Use of Guide RNAs: CRISPR uses designed guide RNAs while restriction enzymes have fixed recognition sites.

    • Cut Types: Restriction enzymes generally create sticky ends; CRISPR can generate blunt ends as well.

Polymerase Chain Reaction (PCR)

Fundamentals:

  • Purpose: Amplifies DNA segments, can include restriction sites in inserts.

  • **Steps of PCR:

    1. Denaturation: Heating DNA to separate strands.

    2. Annealing: Binding primers at specific temperatures.

    3. Extension: DNA polymerase synthesizes the new strand.

Adding Restriction Sites:

  • Methodology: Include additional nucleotides containing restriction sites within primer design to ensure enzymes can cut DNA at desired locations.

Cloning Process for Bioprocess Engineering

  1. Restriction Digestion: Cut plasmid and insert DNA with restriction enzymes.

  2. Ligation Reaction: Use DNA ligase to join the plasmid and insert, ensuring sticky ends are compatible.

  3. Bacterial Transformation: Introduce recombinant plasmid into E. coli for replication.

  4. Colony Inoculation: Select transformed colonies to grow.

  5. Plasmid Purification: Isolate plasmids from bacteria for analysis.

  6. Validation: Verify successful cloning through techniques like Sanger sequencing.

Learning Objectives Summary

After completing the module:

  1. Understand how molecular cloning integrates into bioprocessing pipeline.

  2. Differentiate between restriction enzymes and CRISPR technology.

  3. Identify specific restriction sites and palindromic sequences.

  4. Apply PCR in practical scenarios.

  5. Utilize restriction enzymes and DNA ligase effectively in DNA recombination.

Important Reminders

  • Critical thinking assignment posted on Canvas, due Sunday, April 6.

  • Ensure to prepare for the quiz on Monday!