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Bactaegion
cabinet / series 2026/2 / 1-11 · Shedu
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✦ Bactaegion collective mission○ local·0/ 478 206candidate families touched·0therapeutic hypotheses posted·0annotations completed
1-11 · common · series 2026/2

Shedu

short defense unit

A single known component, and a lifetime of questions.

Proteins
51
Host
bacteria
Discovery
Doron S., 2018
Mechanism
viral DNA replication inh.
DEFENSEFINDER ENTRY OPEN · DEFENSEFINDER.MDMLAB.FR ↗ frame a hypothesis →
✦ The story

Shedu (named after the Mesopotamian protective spirits with bull bodies, guardians of portals) is one of the most minimalist anti-phage systems identified in the 2018 Sorek screen: a single gene appears sufficient to confer measurable phenotypic resistance. This apparent simplicity is misleading — it raises more questions than it answers. How does a single protein detect infection? How does it block viral replication without recruiting effector partners? Does it act alone or does it exploit pre-existing cellular factors (in which case it would be more of a regulatory module than an autonomous system)? In 2026, these questions remain open — Shedu's molecular mechanism is still waiting for its biochemical characterization.

Discovered 2018
By Doron S., Melamed S., Ofir G., Sorek R. et al. (Weizmann Institute) — *Science* 359 (2018)
★ Why we care

Like Janus and DRAPER, Shedu is an orphan mechanism in the Bactaegion cabinet — owned as such. Its characterization is a scientific objective in itself, and its architectural simplicity potentially makes it the most interesting of the three for translation: one gene, transferable, that confers resistance. If biology delivers on its promises for this system, it's a concrete tool for the fermentation industry and a conceptual template for pharmacology ("what can a single protein do?").

◇ The detail that lands

Single-component systems are prime targets for synthetic biology: if a single protein is enough to confer an anti-phage phenotype, then it probably encodes both detection AND effect. So, in theory, transposable into another bacterium without having to co-import an entire operon. If Shedu is confirmed to be minimalist after characterization, it will be an ideal tool to engineer probiotic strains resistant to industrial phages — you would only need to introduce one gene, not ten.

Sources

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