Blog
Practical guides, deep dives, and updates from the PlasmidStudio team.
Adding Purification Tags to Expression Vectors: His, GST, and SUMO Strategies
How to add a His-tag to a protein expression vector and choose between His, GST, and SUMO purification tags—reading frame, linkers, design pitfalls.
Plasmid Map Maker Free Online: Honest Picks for Every Cloning Workflow
Honest comparison of plasmid map maker free online tools: PlasMapper, SnapGene Viewer, ApE, Benchling academic. Pick by scenario, not feature count.
Golden Gate Assembly vs Gibson Assembly Cloning: A Decision Tree for Your Next Construct
Golden Gate vs Gibson assembly cloning: a decision tree with fragment-count thresholds, Type IIS site checks, and reuse tradeoffs.
SnapGene vs Benchling: Which Tool Fits Your Cloning Workflow?
SnapGene vs Benchling for plasmid cloning: a practitioner-level comparison of workflow fit, file fidelity, collaboration, and where both fall short.
How to Design a Plasmid for Bacterial Expression: Six Decisions That Determine Whether You Get Protein
Step-by-step guide to designing an E. coli expression plasmid. Covers promoter selection (T7, trc, araBAD), origin of replication copy number, antibiotic markers, RBS, purification tags, and terminators with practical thresholds and common mistakes.
How to Calculate Annealing Temperature for Cloning Primers: Binding Region, Polymerase, and Method
How to calculate the correct annealing temperature for cloning primers with overhangs. Covers binding-region Tm extraction, polymerase-specific rules for Q5, Phusion, and Taq, and worked examples for restriction cloning and Gibson Assembly.
Double Digest Buffer Compatibility: How to Choose the Right Buffer for Two Restriction Enzymes
Practical guide to restriction enzyme buffer compatibility for double digests. Decision tree for buffer selection, common enzyme pair reference table, sequential digestion fallback, and star activity prevention.
Primer Design for Site-Directed Mutagenesis: Two Methods, One Set of Rules You Can't Skip
How to design mutagenesis primers for both QuikChange and Q5/KLD methods — Tm calculation from flanking regions, mutation positioning, insertion/deletion rules, and the mistakes that produce all wild-type colonies.
Restriction Enzyme Digestion: Temperature, Buffer, and the Decisions That Actually Matter
Practical guide to restriction enzyme digestion — incubation temperatures, buffer compatibility for double digests, star activity prevention, primer Tm with RE overhangs, and enzyme amounts.
Codon Optimization for E. coli: When It Matters, What to Optimize, and What to Skip
Practical guide to codon optimization for E. coli protein expression — CAI thresholds, rare codon clusters, GC content, mRNA structure, and when NOT to optimize.