Merge branch 'bechon27-main-patch-50178' into 'main'

Update pd-t4-4.md

See merge request !136

content/3.defense-systems/pd-t4-4.md

@@ -10,9 +10,19 @@ tableColumns:
     Activator: Unknown
     Effector: Unknown
     PFAM: PF13175, PF13304
+contributors:
+    - Nathalie Bechon
+relevantAbstracts
+    - doi: 10.1038/s41564-022-01219-4
 ---
 
 # PD-T4-4
+## Description
+PD-T4-4 is a defense system composed of two proteins, a P-loop NTPase and a nuclease, that is most likely protecting the bacterial population through abortive infection. It was identified from an ICE in an *E. coli* genome.
+
+## Molecular mechanisms
+PD-T4-4 molecular mechanism is currently unknown, although it is most likely an abortive infection system.
+
 ## Example of genomic structure
 
 The PD-T4-4 system is composed of 2 proteins: PD-T4-4_A and, PD-T4-4_B.
@@ -21,7 +31,7 @@ Here is an example found in the RefSeq database:
 
 ![pd-t4-4](/pd-t4-4/PD-T4-4.svg){max-width=750px}
 
-PD-T4-4 system in the genome of *Escherichia coli* (GCF_013376895.1) is composed of 2 proteins: PD-T4-4_B (WP_176670803.1)and, PD-T4-4_A (WP_027920142.1).
+PD-T4-4 system in the genome of *Escherichia coli* (GCF_013376895.1) is composed of 2 proteins: PD-T4-4_B (WP_176670803.1) and, PD-T4-4_A (WP_027920142.1).
 
 ## Distribution of the system among prokaryotes
 
@@ -78,13 +88,4 @@ end
     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: 10.1038/s41564-022-01219-4
-
----
-::