BioPlayground

PC

ProtocolCore

Suggested Protocols

Exploratory MVP
All protocol fields

Protein & Antibody Workflows — Recombinant Production

Define the product once, then select a genuinely different production route

The catalog does not grow with every protein, antibody, or host record. One Product Definition entry routes to BL21/T7, HEK293 transient, CHO transient, CHO stable pool, or CHO clonal producer, and exports only the selected route contract.

Editable starter protocols

5 bounded routes

What does this protocol do?

It fixes the product definition first, selects exactly one microbial or mammalian route, and connects culture, expression, recovery, purification, and QC steps from that source.

Supported production routes

  • • G. Recombinant expression, production & purification

Scope boundary

HEK and CHO conditions, and transient, stable-pool, and clonal states, are not shared. Conditions from an unselected host are neither recommended nor exported.

Checking Protein Production storage.

Research-use record only; not product release or regulatory lot release.

PRT-PROTEIN-PRODUCTION-P1D-001G. Recombinant expression, production & purification

Source-Governed Recombinant Protein Production Composer

Protein & Antibody Workflows > Recombinant Protein Expression, Production & Purification · PRT-PROTEIN-PRODUCTION-P1D-CENSUS-20260828

Official guidance reviewed
ONE_CATALOG_ENTRY_FIVE_BOUNDED_ROUTESBL21_HEK_CHO_CONDITIONS_NEVER_SHAREDTRANSIENT_POOL_CLONE_TERMINAL_STATES_DISTINCTEXACT_HOST_DERIVATIVE_AND_SOURCE_REQUIREDFIVE_SOURCE_BLOCKS_REQUIREDSOURCE_GOVERNED_COMPOSEDCONNECT_HANDOFF_CONTRACT_REQUIREDADD_REMOVE_REPLACE_FOR_PERSONALIZATIONNO_UNIVERSAL_NUMERIC_DEFAULTSRESEARCH_USE_ONLY

PROTEIN PRODUCTION FOUNDATION

Purpose and scope

A research-use recombinant-protein production composer. It records the product, construct, and exact host first, then separates five execution routes whose host biology and expression modes are not interchangeable. It does not certify GMP, release, clinical/diagnostic fitness, or biosafety classification.

Define before starting

  • Product identity, purpose, format, and subunits
  • Sequence/construct version plus tag, signal, and marker
  • Required folding, PTM/glycan, assembly, and activity
  • Target scale/context and downstream use
  • Exact host derivative, stock/bank, and medium/system

Before execution

  • Verify the exact derivative and source, not only a host-family name
  • Record separate host, expression, recovery, purification, and quality snapshots
  • Never carry numeric conditions across routes
  • Record manufacturer-step changes as ADD/REMOVE/REPLACE with qualification
  • Define stop/route-out criteria and the terminal state in advance

Internal route map

BL21, HEK, and CHO remain bounded routes inside one composer rather than hundreds of host cards. CHO stable pool and clonal producer also stay separate because their terminal states differ.

BL21(DE3)-derived T7 microbial expression

Transformation/selection, source-qualified seed, small expression screen, induction, total/soluble/localized assessment, then scale or route-out.

Product/construct definitionExact strain/vector qualificationTransformation and selectionSource-qualified seedSmall expression screenInduction strategyTotal/soluble/localized assessmentScale or route-outHarvest/recoveryPurification/QC handoff

Terminal: Assessed microbial harvest fraction with total/soluble/insoluble or localized-state provenance

HEK293-derived transient expression

Record the exact HEK293 derivative, adherent/suspension platform, transfection system, expression/viability, and secreted/intracellular harvest.

Product/construct definitionExact HEK derivative/platform qualificationMaintenance/seed readinessTransfection readinessConstruct deliveryExpression/viability monitoringSecreted or intracellular harvestClarificationPurification/QC handoff

Terminal: Assessed HEK293-derived transient harvest with cell/platform and batch provenance

CHO-derived transient expression

Use the exact CHO derivative and CHO-specific transfection/protocol variant; never inherit HEK conditions.

Product/construct definitionExact CHO derivative/platform qualificationMaintenance/seed readinessCHO transfection readinessConstruct delivery and protocol variantExpression/viability monitoringHarvestClarificationPurification/QC handoff

Terminal: Assessed CHO-derived transient harvest with exact protocol-variant and batch provenance

CHO stable-pool development

Integration/transfection, selection, pool recovery, productivity/product quality/stability, ending at a qualified stable population.

Product/construct definitionExact CHO platformTransfection/integrationSelectionStable-pool recoveryPool productivity/product-quality screenStability assessmentQualified poolProduction harvestPurification/QC handoff

Terminal: Qualified CHO stable pool with selection, productivity, product-quality, and stability provenance

CHO clonal-producer development

Extend a stable population through single-cell provenance, clone screening, stability, and banking without inferring clonality.

Product/construct definitionExact CHO platformTransfection/integrationSelection and pool recoverySingle-cell isolation/provenanceClone screeningProductivity/product-quality/stabilityQualified bankProduction harvestPurification/QC handoff

Terminal: Qualified CHO clonal producer bank with single-cell provenance, clone selection, stability, and bank record

Common decisions and stops

  • Hold when product needs and the host/route do not align
  • Stop when the starting culture misses source readiness
  • Route out when expression, solubility, viability, stability, or clonality evidence is insufficient
  • Fail CONNECT when recovery output does not fit purification input
  • Treat QC as fit-for-purpose, not automatic release

Terminal handoff

Preserve the selected route, exact sources, batch/fraction/QC provenance, every CONNECT, change ledger, terminal state, storage, and unresolved risks. Unselected host conditions never enter the export.

How references are used

The body explains the basic workflow. Actual reagent, medium, time, temperature, selection, harvest, and resin conditions are governed by the user-selected manufacturer document and revision. Papers support topology and branching; they are not automatic recipes.

ADD / REMOVE / REPLACE

Even when adopting a manufacturer protocol, record the exact product, catalog, lot/bank, document revision, and locator. Every added, removed, or replaced step or condition requires ADD / REMOVE / REPLACE, rationale, local qualification, and rollback.

Research Use Only · no GMP, release, clinical/diagnostic-fitness, or biosafety-class claim.

Add your assay information before use

This draft provides an ordered workflow and rational starting conditions. It intentionally contains no sample primer or probe sequence. Enter your target-specific oligonucleotides and finalize every condition against the actual enzyme, kit, instrument instructions, and assay-validation data.

1

0. DEFINE THE PRODUCT AND INTENDED USE

Record protein or antibody identity, research purpose, format/subunits, sequence and construct version, expected localization, folding/PTM/assembly/activity needs, target scale, downstream use, and fit-for-purpose quality context before selecting a host.

Condition: No universal best host is assigned. Unresolved product attributes remain explicit routing questions.
2

1. SELECT ONE BOUNDED PRODUCTION ROUTE

Choose BL21/T7, HEK293 transient, CHO transient, CHO stable pool, or CHO clonal producer. Record the exact strain/cell derivative and expression mode; do not create a protocol card for each protein, antibody, or host record.

Condition: Changing route resets route-specific sources, handoffs, and decisions so conditions cannot leak across hosts.
3

2. FREEZE CONSTRUCT AND HOST-SYSTEM RECORDS

Link the product definition to one exact expression construct and one exact host/stock/bank record. Capture vector/promoter, signal/localization elements, tags, markers, multi-chain pairing, host origin, derivative, source, lot/bank/passage context, medium/system, and change history.

Reagent: USER REQUIRED — exact construct and host-system recordsCondition: HEK293 derivatives and CHO derivatives are not synonyms; BL21(DE3) is not equivalent to non-DE3 or non-T7 microbial systems.
4

3. QUALIFY THE ROUTE-SPECIFIC STARTING CULTURE

Follow the exact host-system source for transformation/selection and seed preparation in the microbial route, or maintenance/seed readiness in mammalian routes. Stable routes additionally require an integration/selection plan and defined population endpoint.

Condition: Record actual readiness evidence and route out when the exact source requirements are not met.
5

4. EXECUTE THE SELECTED EXPRESSION OR DEVELOPMENT ROUTE

Apply only the selected route state machine: small-screen and induction for BL21/T7; transient transfection and monitoring for HEK293 or CHO; integration, selection, pool recovery, and optional clonal development only in the corresponding stable route.

Reagent: USER REQUIRED — exact expression/transfection/integration/selection source snapshotCondition: All manufacturer additions, removals, or replacements are explicit. The scaler performs arithmetic only from user-entered source values and recommends no reagent or condition.
6

5. PASS ROUTE-SPECIFIC DECISION AND STOP POINTS

Assess total versus soluble/localized expression for BL21, cell/platform readiness and harvest criteria for transient mammalian routes, stable-population qualification for stable pools, and single-cell provenance plus stability/banking evidence for clonal producers.

Condition: Low expression, incompatible quality, failed recovery, unsupported clonality, or source mismatch causes hold or route-out rather than an automatic PASS.
7

6. HARVEST, RECOVER, AND PRESERVE FRACTION PROVENANCE

Record harvest criterion, localization, starting matrix, clarification or lysis/refolding/membrane operation, retained and discarded fractions, volume/concentration basis, deviations, and the exact material state handed to purification.

Condition: Secreted supernatant, intracellular soluble fraction, inclusion body, periplasmic and membrane fraction are different inputs and never share a hidden recovery recipe.
8

7. DESIGN AND EXECUTE THE SOURCE-GOVERNED PURIFICATION TRAIN

Choose capture, intermediate, and polishing operations only when required by the product and supported by exact product/resin/membrane/equipment IFUs. Record the fraction ledger and every source-to-source CONNECT contract.

Reagent: USER REQUIRED — exact purification product and IFU snapshotsCondition: A general handbook does not authorize resin-specific capacity, flow, buffer, pressure, cleaning, or lifetime values.
9

8. COMPLETE FIT-FOR-PURPOSE PRODUCT QC

Record method and result provenance for quantity, identity, purity/aggregate, activity, product-specific PTM/assembly, process/product impurities and endotoxin context where relevant. Define acceptance in relation to the stated research use.

Condition: The composer does not infer release criteria, potency, GMP readiness, clinical suitability, or manufacturing consistency.
10

9. CLOSE THE ROUTE-SPECIFIC HANDOFF

Export only the selected route, exact source snapshots, CONNECT reviews, change ledger, batch/fraction/QC records, terminal state, storage, and downstream handoff. Keep unresolved risks and route-outs visible.

Condition: Output is Research Use Only. Stable pool and clonal producer bank remain distinct terminal states.