Barrick Lab :: Laboratory Protocols

Creating Protocols

• How to Create a Protocol
  Best practices for designing a protocol and for putting it on the lab Wiki.
• Updates Needed
  Request new protocols and changes to protocols.

Lab Stocks and Practices

• Standard Microbiological Practices
  aka the approximately Ten Commandments of microbiology lab research.
• Autoclave Sterilization
  
• Cleaning Glassware
  
• Media Recipes
  Solid and liquid media for bacterial growth.
• Antibiotics and Supplements
  Stock solutions and working concentrations of antibiotics and media supplements.
• Reagent and Buffer Recipes
  How to prepare common stocks of chemical solutions used in lab.
• Plasmids
  Sequences and characteristics of plasmids commonly used in lab.
• Freezing Strains
  How to freeze and archive strain samples.
• Strain Database
  How to search and enter samples in the lab database.
• Phusion (pfu-sso7d) polymerase purification
  Draft: How to prepare and harvest pfu-sso7d polymerase.
  
• Keio and ASKA Collections
  Information about finding and using these E. coli strains.
• Find strains and plasmids
  List of commonly used culture/plasmid collections.
• Find sources for chemicals
  Search by structure, identify chemical synonyms, and find commercial sources.

PCR and Sequencing

• Sequencing/Genotyping Primer Design
  Design primers to validate mutations in evolved genomes.
• Escherichia coli REL606 Genome Resources: Design Primers | Blast | Genbank | Browser |BioCyc
• Acinetobacter baylyi ADP1 Genome Resources: BLAST | BioCyc | Quick Reference
• Predicting transcription start sites in bacteria: BPROM | PPP | NNPP
• Notes about degenerate bases from IDT
• Ordering Primers | ICMB's IDT page
• Resuspending Primers
• Standard PCR
  • Which polymerase is right for me?
  • Easy DpnI Digestion
• Overlap PCR
• Agarose Gel Electrophoresis
• DNA Concentration Determination
  Protocols for Qubit, Nanodrop, and Agarose Gel DNA concentrations, and example data highlighting caveats for each.
• DNA Sequencing
• 16S rRNA Sequencing
  16S rRNA PCR and sequencing to identify unknown microbes
• Tools: Blast2Seq (NCBI) | ORF Finder (NCBI) | Translate (EMBOSS)
• MEGAWHOP
• Illumina Next Generation Sequencing
  Protocol for NGS library generation
• ADP1 Tn-seq Library Prep
  Protocol for preparing a Tn-seq library for ADP1 strains mutagenized with pBT20
• qPCR to quantify plasmid copy number

Genetic Modification and Cloning

• Conjugation General conjugation protocol for introducing plasmids to bacteria.
• UV Mutagenesis to create a mutation library
  Make a library of mutants with UV irradiation.
• Selecting Arabinose Marker Revertants
  Direct selection of Ara+ revertants from Ara– strains.
• Electrocompetent Cells
  Make electrocompetent E. coli stocks for transformation.
• Electroporation of your Electrocompetent Cells
  Transform your Electrocompetent cells with DNA.
• Colony Transformation
  Rapid chemical transformation of E. coli colonies with high copy plasmids..
• Ethanol Precipitation
  Precipitate DNA to remove salts before electroporation.
• Restriction Enzyme Cloning
  Insert a target DNA sequence into a plasmid via restriction digest and ligation.
• Gene Gorging Neutral Markers
  λ red genetic modification for mutations with a selectable or screenable marker using donor plasmid. For example, converting Ara+ strains to Ara–.
• Gene Gorging Evolved Alleles
  λ red genetic modification without a selectable or screenable phenotype using donor plasmid.
• FLP-FRT Recombination
  Induce targeted recombination (commonly used to eliminate the Kan^R cassette from Keio strains).
• Genome Modification (Datsenko and Wanner Method)
  λ red genetic modification using a PCR product containing a selectable marker.
• Gene Replacements (Church Method)
  Allelic exchange using pKOV integration. Generate unmarked mutations.
• Gibson Cloning
  Make complex constructs from multiple genetic parts. Master mix recipe, procedure, and Gibson walkthrough included.
• lambda red mediated ssDNA gene modification
  λ red mediated ssDNA oligo mutation reconstruction.
• pSLTS genomic editing for E. coli (Copley lab)
  Scarless genome modification using pSLTS plasmids developed by Copley lab.
• Transforming Acinetobacter baylyi ADP1
  How to transform Acinetobacter baylyi ADP1 with plasmids or PCR products.
• Acinetobacter baylyi ADP1 genome manipulation
  How to make deletions, insertions, and other modifications to the Acinetobacter baylyi genome.
• Acinetobacter baylyi ADP1 "Golden Transformation" genome manipulation
  How to make fast near scarless deletions to the Acinetobacter baylyi genome using a modified Golden Gate Cloning methodology.
  
• Acinetobacter baylyi ADP1 "in plate" and "puddle transformations"
  Transformation of ADP1 in solid medium is known to achieve higher transformation efficiency. Quick and ideal for difficult transformations or when low amounts of transforming DNA are available.
• Megaprimer Megawhop Mutagenesis
  Simple and reliable method for introducing specific mutations into plasmids.
• Golden Gate Assembly (YTK version)
  Multi-part DNA assembly.
  • Making a new Golden Gate Part Vector
    Cloning into the entry vector.
  • Protocols Golden Gate Assembly of Cassette Plasmids[Assembly of Cassette Plasmids]]
• CIDAR Moclo Kit
  Using the CIDAR MoClo kit for golden gate assembly of plasmid variants
• P1 Transduction
  Quickly move mutations that are linked to a selectable marker between E. coli strains.
• Preparing and Transforming Chemically Competent Cells
  No-kit Inoue method

Mutation Rates, Growth Rates and Evolutionary Stability

• Fluctuation Tests
  Measure bacterial mutation rates to antibiotic resistance, phage resistance, or reversion of auxotrophy.
• Growth Rates
  Measure bacterial growth rates from OD600/platereader data
• Phage Stocks
  Phage Lysate Preparation (T4,T5,T6) and Determining Phage Titer
• Fluorescent Protein Evolutionary Stability
  Measure the evolutionary stability of fluorescent protein expression.

Genome Resequencing and Mutation Validation

• Genomic DNA Isolation
  Isolate gDNA for genome resequencing.
• Targeted Sequencing of a Specific Gene
  To find mutations or validate predictions from whole-genome re-sequencing data.
• Mutation Rates from Genome Resequencing
  How to estimate mutation rates (and confidence limits) from counts of mutations in multiple genome data sets.

Experimental Evolution

• Competitive Fitness Assays
  Measure the head-to-head relative fitness of two strains in co-culture.
• Competence Assays
  Measure the transformation frequency in Acinetobacter baylyi.
• Identifying Ribose Operon Deletions
• Mutation Accumulation for Microsatellite Strains
• Bacteria Mutation Accumulation Experiments
  Propagate bacteria through single-cell bottlenecks to measure mutation rates.

Flow Cytometry and Cell Sorting

• Generic Flow Cytometry guidelines
  Guidelines for flow cytometry on the Fortessa (basic) instrument.
• Sorting Bacterial cells using the FACSAria

RNA Preparation and Sequencing

• RNA Preparation
  Preparation of high quality RNA using RNA Snap method combined with Zymo column purification.
• RNAseq
  Preparation of rRNA-free libraries from bacterial culture for submission to GSAF core.

Nucleic Acid In Vitro Selection

• Spectrophotometric Nucleic Acid Quantitation
  Determine concentrations of oligonucleotides and other nucleic acids from absorption spectra.
• Polyacrylamide Gel Electrophoresis
  Denaturing and nondenaturing (native) polyacrylamide gel electrophoresis.

Non-canonical Amino Acids

• Working with an Expanded Genetic Code
  Properties of amino acids—both canonical and non-canonical—and their use in organisms with an expanded genetic code.
• Preparing Stock Solutions for ncAA
  Making stock solutions for non-canonical amino acids (ncAA).

Protein Expression and Purification

• Large-scale Protein Expression in E. Coli
• Running SDS-PAGE Protein Gels
• Purifcation of 6xHis-Tagged Proteins from E. Coli lysates

Working with Unusual Microbes

• Culturing Snodgrassella alvi
• Culturing Gilliamella apicola
• Culturing Bartonella apis

Accessing the Literature and Managing Citations and presentation information

• Off Campus Journal Access
  Methods of finding, discovering and accessing various journal articles
• Saved Article Searches
  Set up automatic updates to find current publications of interest
• How to make a good presenation
  How to make a good presenation under different considerations.

Useful Resources

• Retired and rarely used protocols
• Links to Product Manuals
  
• OpenWetWare a Wiki of biological protocols
• Enzymes used in molecular biology: a useful guide