Phage-Assisted Continuous Evolution (PACE) Technology

CD Biosynsis employs cutting-edge Phage-Assisted Continuous Evolution (PACE) Technology for the rapid, automated, and continuous directed evolution of proteins, pathways, and genetic circuits. PACE is a revolutionary microbial evolution platform that links the survival and reproduction of M13 bacteriophages to the successful performance of the protein or function under selection. By performing evolution in a liquid culture with continuous dilution, PACE achieves mutation and selection cycles thousands of times faster than traditional methods, compressing weeks or months of laboratory work into just days. This technology is ideal for engineering enzymes with vastly improved activity, stability, or altered substrate specificity, as well as optimizing components for synthetic biology applications. We provide comprehensive PACE assay design, evolution operation, and full characterization of the highly evolved mutants.

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Automated, Ultra-Rapid Evolution Under Continuous Selection

PACE operates within a bioreactor system where E. coli cells harbor the target gene (e.g., an enzyme) and auxiliary selection components. The critical element is the 'Selection Plasmid' (SP), which carries the target gene and controls the expression of a key phage protein (pIII) essential for phage replication. If the enzyme performs the desired function, it activates the expression of pIII, allowing the phage to complete its life cycle and infect new cells. Non-performing variants fail to express pIII, leading to their eventual washout from the system due to continuous dilution. This setup maintains a high mutation rate and a relentless selection pressure, allowing beneficial mutations to accumulate rapidly. The continuous nature of PACE (sometimes termed 'evolution without human intervention') drastically shortens the time required to achieve high-level functional improvements, often reaching evolutionary endpoints in 2-5 days.

Customizable PACE Evolution Modules

Evolution Target Focus Advanced PACE Modes Characterization and Validation

Choose Your Evolution Target Focus

Select the functional trait or molecule you wish to evolve using the continuous selection pressure of PACE:

Check the box next to the desired evolution target:

Enzyme Activity Enhancement

Substrate Specificity Alteration

Protein/Enzyme Stability (Thermal/Solvent)

Transcription Factor Optimization

Riboswitch/RNA Circuit Optimization

Genetic Circuit Component Tuning

Antibody Affinity Maturation

Novel Biosensor Development

Advanced PACE Evolution Modes

Specialized PACE setups to address complex selection criteria:

Select the advanced mode required for complex evolution:

Standard PACE (Positive Selection)

p-RATE (Evolution of Genetic Circuits)

TRACE (Evolution of Regulatory Elements)

PACE with Mutator Phage

Parallel Evolution (Multiple Conditions)

Step-Wise Selection Pressure Increase

Host Strain Engineering for PACE

Real-time Bioreactor Monitoring

Characterization and Validation

Essential post-evolution analysis to validate and deliver evolved variants:

Sequence Analysis

Sanger and Next-Generation Sequencing of evolved genes to identify accumulated beneficial mutations.

Activity Kinetics (kcat/Km)

In vitro biochemical validation to quantify improvement in catalytic efficiency compared to the starting enzyme.

Stability Testing

Measuring the thermal or solvent stability of the evolved enzyme/protein variant.

PACE Technology Workflow

A continuous, high-speed evolutionary cycle designed for maximal improvement.

Assay Development & Setup

Continuous Evolution Run (Days)

Sample Collection & Sequencing

Validation & Delivery

Link Function to Phage Fitness: Design the genetic circuit where the desired function (e.g., enzyme activity) controls pIII expression.

Bioreactor Setup: Establish the steady-state conditions in the bioreactor (selection and replication vessels) with continuous feed and dilution.

Run Initiation: Introduce the starting gene library and the selection phage to begin the continuous infection-selection cycle.

Adaptive Evolution: Allow the system to run for several days/weeks, enabling thousands of mutation-selection cycles under constant pressure.

Sampling: Collect phage and host cell samples at regular intervals to monitor evolutionary progress.

Sequencing: Isolate the evolved genes from the phage/host and perform NGS to identify beneficial mutations and the evolutionary pathway.

  • Re-cloning: Clone the identified, beneficial variants into a standard expression plasmid.
  • Functional Validation: Express and purify the evolved protein, quantify activity (kcat/Km), and confirm improved stability.
  • Documentation: Provide sequencing data, in vitro validation results, and final evolved genetic constructs.

Unprecedented Speed and Automated Precision

Ultra-Accelerated Evolution

           

Achieves thousands of evolutionary generations in days, drastically compressing the timeline compared to iterative methods.

Continuous Selection Pressure

           

Relentless, automated pressure ensures rapid accumulation of beneficial mutations and minimal human intervention.

Access to Complex Mutants

           

The high evolutionary speed facilitates the generation of beneficial multi-point mutations that are often inaccessible otherwise.

Synthetic Biology Optimization

           

Ideal for tuning components of genetic circuits, biosensors, and protein-protein interactions where rapid optimization is needed.

Client Testimonials on PACE Technology

"Using PACE, they successfully evolved our target enzyme to a 50-fold higher catalytic efficiency in just four days of continuous evolution. This speed is unmatched."

Dr. Samuel Liu, Directed Evolution Research Lead

"The team designed a sophisticated p-RATE selection assay to tune the dynamic range of a synthetic biosensor component, achieving optimal performance within a week."

Ms. Elena Vasileva, Synthetic Biology Program Manager

"PACE helped us identify critical multi-site mutations for high thermal stability that we simply could not have found using traditional plate-based screening methods."

Mr. Kenji Tanaka, Industrial Enzyme Development

FAQs about Phage-Assisted Continuous Evolution (PACE)

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How much faster is PACE than traditional directed evolution?

PACE operates in an evolutionary timescale that is thousands of times faster. Traditional directed evolution involves manual, iterative cycles (mutagenesis, selection, screening, picking) that take weeks/months, while PACE performs these cycles continuously and automatically over a few days.

What types of selection criteria can be used with PACE?

PACE can select for any function that can be genetically linked to the expression of the M13 phage pIII protein. This includes enzyme activity (via metabolite production), binding affinity, protein stability, and the successful operation of a complex genetic circuit.

Can PACE evolve non-enzyme proteins, like transcription factors?

Yes. Any protein or genetic element whose function can be coupled to the activation of a promoter controlling pIII expression can be evolved. This includes transcription factors, RNA-binding proteins, and riboswitches, often utilizing advanced PACE modes like TRACE or p-RATE.

What is a 'Mutator Phage' in the context of PACE?

A mutator phage carries error-prone DNA polymerase variants, increasing the local mutation rate of the target gene during replication. This accelerates the accumulation of beneficial mutations, which is essential for evolving functions requiring many sequence changes.

How much does Metabolic Engineering services cost?

The cost of Metabolic Engineering services depends on the project scope, complexity of the target compound, the host organism chosen, and the required yield optimization. We provide customized quotes after a detailed discussion of your specific research objectives.

Do your engineered strains meet regulatory standards?

We adhere to high quality control standards in all strain construction and optimization processes. While we do not handle final regulatory approval, our detailed documentation and compliance with best laboratory practices ensure your engineered strains are prepared for necessary regulatory filings (e.g., GRAS, FDA).

What to look for when selecting the best gene editing service?

We provide various gene editing services such as CRISPR-sgRNA library generation, stable transformation cell line generation, gene knockout cell line generation, and gene point mutation cell line generation. Users are free to select the type of service that suits their research.

Does gene editing allow customisability?

Yes, we offer very customised gene editing solutions such as AAV vector capsid directed evolution, mRNA vector gene delivery, library creation, promoter evolution and screening, etc.

What is the process for keeping data private and confidential?

We adhere to the data privacy policy completely, and all customer data and experimental data are kept confidential.

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