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Commit c9e6d058 authored by Jean  CURY's avatar Jean CURY
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Update mok_hok_sok.md

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......@@ -10,9 +10,26 @@ tableColumns:
Activator: Unknown
Effector: Unknown
PFAM: PF01848
relevantAbstracts:
- doi: 10.1128/jb.178.7.2044-2050.1996
- doi: 10.1016/0022-2836(92)90714-u
contributors:
- Jean Cury
---
# Mok_Hok_Sok
## Description
The Mok Hok Sok system was discovered as a type 1 toxin-antitoxin system to stabilize plasmid R1 :ref{doi=10.1128/jb.161.1.292-298.1985}. Sok (Suppression of Killing) is an RNA and serves as the antitoxin. Hok (Host killing) is the toxin and Mok (Modulation of killing) is required for the expression of Hok :ref{doi=10.1016/j.mib.2007.03.003,10.1093/nar/gkl750}.
Hok/sok are not related to the T4 head protein Hoc and Soc.
This system defends against T4 phages only, as far as we currently know.
## Molecular mechanism
Upon infection of phage T4, the transcription is halted by the phage, which leads to a decreasing level of the antitoxin Sok within a few minutes. The Hok proteins manage to be process in their active form and trigger cell death by depolarization of the membrane :ref{doi=10.1006/jmbi.1995.0186} before the later stage of the phage infection (assembly, packaging and lysis).
## Example of genomic structure
The Mok_Hok_Sok is composed of 2 proteins: Mok and Hok.
......@@ -51,7 +68,7 @@ graph LR;
Pecota_1996[<a href='https://doi.org/10.1128/jb.178.7.2044-2050.1996'>Pecota and Wood, 1996</a>] --> Origin_0
Origin_0[R1 plasmid of Salmonella paratyphi
<a href='https://ncbi.nlm.nih.gov/protein/WP_001372321.1'>WP_001372321.1</a>] --> Expressed_0[Escherichia coli]
Expressed_0[Escherichia coli] ----> T4 & LambdaVir
Expressed_0[Escherichia coli] ----> T4
subgraph Title1[Reference]
Pecota_1996
end
......@@ -63,20 +80,10 @@ end
end
subgraph Title4[Phage infected]
T4
LambdaVir
end
style Title1 fill:none,stroke:none,stroke-width:none
style Title2 fill:none,stroke:none,stroke-width:none
style Title3 fill:none,stroke:none,stroke-width:none
style Title4 fill:none,stroke:none,stroke-width:none
</mermaid>
## Relevant abstracts
::relevant-abstracts
---
items:
- doi: 10.1128/jb.178.7.2044-2050.1996
---
::
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