© Benaki Phytopathological Institute
Phytobacterial type III secretion systems in the era of biotechnology
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HopM1 (HopPtoM)
Degradation of AtMIN7 to suppress PTI & SA-regulated
immunity; targets MIN7 and others
P.s.t
DC3000
v v x
Tomato
AvrE1
Suppress defences by perturbing host’s G-protein reg-
ulation
P.s.t
DC3000
v v x
Arabidopsis
HopC1 (HopPtoC)
Inhibit flagellin-induced NHO1 expression
P.s.t
DC3000
x x x
Lettuce
HopN1 (HopPtoN)
Is localized to chloroplasts, degrades PsbQ & inhibits PSII
P.s.t
DC3000
v
v
HopAB1 (VirPphA)
Suppression of HR
P.s.ph
R7 1449B
v v
AvrB2 (avrPphC)
Suppress cell death triggered by other effectors
P.s.ph
R7 1449B
v
Bean, Pepper
HopZ3 (HopPsyV)
Suppress isoflavone biosynthesis
P.s.s
B728a
v
Cotton, Lettuce,
Tomato, Pepper,
N. benthamiana
AvrRpt2
Suppresses basal defences, RPM1-induced HR; suppress-
es RAP2.6; targets RIN4
P.s.t
JL 1065
v
Arabidopsis,
Pepper, Tomato
AvrRpm1
Suppresses basal defences; target RIN4
P.s.ma
M6
v
Soybean, Arabidopsis
HopZ2 (avrPpiG1)
Targets host
SUMOylated
proteins; Degradation of PBS1
P.s.pi
151
v
HopAR1 (avrPphB)
Induces JA -responsive genes Degradation of PBS1;
Suppresses RAP2.6; targets PBS1/BIK1/PBLs
P.s.ph
R4 & R3 v
Bean, Arabidopsis
Tomato, Cotton,
Lettuce
HopAI1 (HolPtoAI)
Targets MAPK-signalling & flagellin-induced NHO1 expr.
P.s.t
DC3000
v
Lettuce
HopS1 (HolPtoZ)
Suppressing the flagellin-induced
NHO1
expression
P.s.t
DC3000
v
HopAF1 (HopPtoJ)
Suppressing the flagellin-induced
NHO1
expression
P.s.t
DC3000
v
HopT1-1 (HopPtoT1)
Suppressing the flagellin-induced
NHO1
expression
P.s.t
DC3000
v
Arabidopsis, Tomato,
Lettuce
HopT1-2 (HolPtoU2)
Suppressing the flagellin-induced
NHO1
expression
P.s.t
DC3000
v
HopAA1 (HopPtoA1)
Suppressing the flagellin-induced
NHO1
expression
P.s.t
DC3000
v
N. benthamiana
,
Tomato, Lettuce,
Cotton
HopI1
Causes chloroplast thylakoid structure remodelling and
suppresses SA accumulation; targets Hsp70
P.c.al
ES4326
v
HopU1
S
uppresses plant innate immunity
has mono-ADP-ribo-
syltransferase activity; targets GRP7 and other
P.s.t
DC3000
v v
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