bioplastides

Bioplastides are a proposed class of plastid-like organelles described in speculative biology and some fictional works. They are envisioned as intracellular compartments that originate from endosymbiotic plastids and specialize in the synthesis and storage of biopolymers that can be used to produce biodegradable plastics. The term combines bio- with plastide, echoing plastids found in plants and algae.

In models discussing bioplastides, these organelles are typically described as double-membrane bound, containing a compact, sometimes autonomous, genome or a nucleus-encoded set of genes with partial organellar expression. They carry enzymatic pathways for the production of polylactic acid, polyhydroxyalkanoates, or other biodegradable polymers. Some scenarios propose gene transfer to the host nucleus, with protein import sequences guiding organelle maintenance.

They are proposed to interact with host metabolism, providing a dedicated reservoir and synthesis site for biopolymers, and potentially exporting monomers or polymers through specialized transport systems. Bioplastides may contribute to cellular stress responses, energy storage, and structural reinforcement under certain conditions.

Bioplastides are not recognized as a real biological organelle in current mainstream biology. They appear primarily in speculative literature and some fiction, as well as in preliminary synthetic biology concepts exploring intracellular production of bioplastics. Their feasibility and regulation remain topics of theoretical discussion rather than established science.

Related terms include plastid, endosymbiosis, bioplastics, and synthetic biology.