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cabinet / series 2026/2 / 1-27 · Kiwa
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1-27 · common · series 2026/2

Kiwa

KwaA/KwaB membrane-associated defense

The system that watches the membrane rather than the genome.

Couple KwaA + KwaB associé à la membrane bactérienne. Détecte vraisemblablement les perturbations membranaires causées par l'insertion phagique. Mécanisme moléculaire partiellement résolu, intérêt translationnel humain limité à ce stade.

Proteins
168
Host
bactéries
Discovery
Doron S., 2018
Mechanism
défense associée à la membrane
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✦ The story

Kiwa is a Maori mythological figure associated with the ocean — a guardian of the boundaries between elements. The Kiwa anti-phage system plays that role literally: it is associated with the bacterial membrane, and likely detects the disturbances caused by the injection of phage DNA across the membrane. Most bacterial defenses intercept the phage after injection (at the DNA or translation level); Kiwa intercepts at the moment of entry. The molecular mechanism is still partially resolved in 2026, but the "sense at the threshold" principle is conceptually remarkable.

Discovered 2018
By Doron, Melamed, Ofir et al. (Weizmann Institute)
★ Why we care

The molecular mechanism is poorly characterized, translational priority is low for now. But Kiwa is an excellent subject for anyone wanting to plant a thesis on an understudied system — the TLR analogy opens a direct translational discussion avenue.

◇ The detail that lands

The idea of membrane-level detection is conceptually comparable to human TLRs (Toll-like receptors), which monitor pathogen entry by being posted on the plasma or endosomal membrane. Nature invented the "watch the door rather than the inside" strategy twice.

Sources
  1. Doron S. et al., Systematic discovery of antiphage defense systems in the microbial pangenome, Science 359 (2018). doi:10.1126/science.aar4120
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