16.2 Synthetic Cell Molecular Cargo Classes

Synthetic Cell Molecular Cargo Classes describes the distinct categories of molecular material that can be encapsulated within a synthetic cell compartment, spanning genetic material, protein and enzymatic components, complex biological extracts, small-molecule building blocks, and larger structural assemblies. Each class carries its own characteristic requirements and considerations for successful incorporation and retention, distinguishing it from the general concepts of encapsulation addressed elsewhere in this scope.

Genetic and Expression Machinery Cargo

Encapsulated Nucleic Acid Cargo

Encapsulated nucleic acid cargo refers to DNA or RNA molecules incorporated into a compartment's interior, typically intended to serve as genetic templates for downstream expression processes, requiring an internal environment compatible with preserving nucleic acid structural integrity.

Encapsulated Ribosomal Cargo

Encapsulated ribosomal cargo refers to ribosomes or ribosomal components incorporated into a compartment's interior, representing the molecular machinery specifically required to translate genetic information into protein products within the compartment.

Encapsulated Cell Extract Cargo

Encapsulated cell extract cargo refers to a complex mixture derived from biological cells, containing a broad combination of proteins, nucleic acids, and other cellular components, incorporated as a single composite cargo rather than as individually purified components.

Functional Protein Cargo

Encapsulated Protein Cargo

Encapsulated protein cargo refers to protein molecules of any functional class incorporated into a compartment's interior, serving as the general category under which more specific protein cargo types, such as enzymes, are organized.

Encapsulated Enzyme Cargo

Encapsulated enzyme cargo refers to catalytically active protein molecules incorporated into a compartment's interior, intended to carry out specific chemical transformations within the enclosed internal environment.

Metabolic and Energetic Cargo

Encapsulated Metabolic Substrate Cargo

Encapsulated metabolic substrate cargo refers to small molecules incorporated as the starting reactants for internal metabolic or biochemical reactions, providing the raw material that enzymatic or other catalytic cargo will act upon.

Encapsulated Cofactor Cargo

Encapsulated cofactor cargo refers to small molecules incorporated specifically to support the activity of enzymes or other functional cargo, serving an assisting role rather than being directly transformed as a primary reactant.

Encapsulated Energy Carrier Cargo

Encapsulated energy carrier cargo refers to molecules incorporated specifically to supply or store chemical energy usable by internal processes, distinguishing this cargo class by its energetic function rather than its structural or catalytic role.

Structural and Small-Molecule Cargo

Encapsulated Small-Molecule Cargo

Encapsulated small-molecule cargo refers to low molecular weight compounds incorporated into a compartment's interior, serving as a general category encompassing metabolic substrates, cofactors, energy carriers, and any other small molecule not otherwise classified.

Encapsulated Macromolecular Complex

Encapsulated macromolecular complex refers to an already-assembled, multi-component molecular structure incorporated as a single unit, distinguishing this cargo class from individually incorporated components that would need to assemble into a complex after encapsulation.

Encapsulated Particle Cargo

Encapsulated particle cargo refers to solid or semi-solid particulate material incorporated into a compartment's interior, representing a structurally distinct cargo class from dissolved molecular species.

Combining Cargo Classes

Mixed Molecular Cargo Set

A mixed molecular cargo set refers to a deliberately combined collection of cargo drawn from more than one of the classes described above, incorporated together to support a coordinated internal function that no single cargo class could achieve alone, such as combining nucleic acid, ribosomal, and small-molecule cargo to support internal gene expression.

Choosing Cargo Classes

Synthetic Cell Cargo Class Selection

Synthetic cell cargo class selection is the deliberate design decision of which specific cargo classes, and which combination of them, to incorporate into a given synthetic cell compartment, guided by the intended internal function the compartment is meant to support and by each cargo class's specific compatibility and retention requirements.