Week 1 HW: Final Project Ideas

SynDehe: Autonomous synthetic macrophage biomanufacturing for municipal water remediation

1. What do you want to make? I want to biomanufacture a SynDehe Unit: a cell-free synthetic vesicle designed to act as an environmental “macrophage” that detects, agglutinates, and precipitates targeted micropollutants from municipal water. Each unit combines a robust lipid bilayer vesicle (the structural chassis) loaded with a cell-free expression system (CFES) that synthesizes and displays engineered surface receptors (e.g., camelid nanobodies or metallothioneins).

Why? Providing safe drinking water requires advanced systems that can handle emerging microscopic threats (nanoplastics, heavy metals) that evade standard physical screens. By acting as a programmable “molecular Velcro” for pollutants, SynDehe units provide the specificity of a biological immune response without the ecological and regulatory risks of releasing live genetically modified organisms (GMOs) into the environment.

My short-term goal is a research-grade toolkit of functionalized vesicles for targeted heavy metal capture. My long-term motivation is to transition environmental remediation from blunt chemical coagulants to programmable synthetic biological infrastructure.

2. What living system could make it? Primary chassis: A semi-living system: Cell-Free Expression Systems (CFES) derived from E. coli or wheat germ, encapsulated within giant unilamellar vesicles (GUVs). Input: DNA templates coding for target-specific receptors, amino acids, energy (ATP), and a structurally robust lipid mixture. Biological process: Transcription → translation → protein folding → anchoring of receptors to the vesicle’s outer membrane. Output: Programmable, non-replicating synthetic cells capable of specific environmental binding.

Alternative / complementary systems: Microbial (Pichia pastoris or E. coli) for the bulk fermentation and high-yield production of the internal CFES machinery and DNA templates prior to encapsulation. Assumption: The lipid boundary will protect the transcription machinery from the harsh water environment just long enough to express the surface receptors before they neutralize the threat.

3. How could automation help you make it? Automation is required to transition this from a batch lab experiment to continuous municipal infrastructure, specifically at three stages:

  • Extract Prep & Formulation: Liquid-handling robots (Opentrons) to formulate the CFES master mixes and lipid stocks across hundreds of variants.
  • Vesicle Assembly: Massively parallel droplet microfluidics to encapsulate the CFES inside uniform lipid vesicles continuously.
  • Testing & QC: Automated dynamic flow-cells paired with machine vision to simulate municipal water turbulence, quantifying agglutination and precipitation rates in real-time.

Why automation? The design space (Receptor variant × Lipid formulation × Environmental pH/flow) is highly combinatorial. Furthermore, treating millions of liters of water requires massive manufacturing parallelization that is impossible without automated, continuous-flow microfluidics.

4. What would it take to make it at a meaningful scale? (a) How much? Meaningful scale = treating a mid-sized municipal flow of 10 million liters (10,000 m³) of water per day.

  • Assumption: Dosing at 1 mg/L requires 10 kg of SynDehe vesicles daily.
  • Given a GUV mass (10⁻⁹ g), this requires manufacturing ~10¹³ vesicles per day.
  • This throughput requires approximately 11,500 parallel microfluidic channels running continuously.

(b) How long?

  • DNA & CFES: Bulk cell-free extract production and DNA template synthesis takes 3 weeks.
  • Assembly: Once the microfluidic arrays are calibrated, production is a continuous flow rather than a batch process. Setting up the pilot array to handle a daily 10 kg output would take 6 weeks, but operations run 24/7 thereafter.

5. What don’t you know yet? (biggest unknowns)

  • Physical Stability in the wild: Will the synthetic lipid membrane survive the shear forces, osmotic pressures, and fluctuating pH of raw municipal wastewater without prematurely lysing?
  • Precipitation Dynamics: We know they will bind, but will the agglutinated pollutant-vesicle complexes form flocs heavy enough to sink reliably in standard municipal decantation tanks?
  • Economic Viability: Can scaling parallel microfluidic channels and CFES production compete economically with the extremely cheap chemical coagulants currently used in global water treatment?
  • Ecological Fate and Biodegradability: Even though they are cell-free and non-living, what is the environmental consequence of the cleanup itself? We do not yet know how the agglutinated lipid-protein-metal complexes will biodegrade in the municipal sludge, or if introducing massive amounts of synthetic biological material could inadvertently disrupt the natural microbial ecosystems downstream.

Assisted by Gemini. Prompt: “Help me frame my ideas on synthetic environmental macrophages targeting heavy metals as a biomanufacturing project answering the four HTBAA questions: what to make, living system, automation, and scale.” from there i made my own analysis and asked for help with the code structure, finally i asked for an image of my idea.