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. 2021 Nov 25;12:754486. doi: 10.3389/fmicb.2021.754486

TABLE 3.

Type IV secretion system (T4SS) and type VI secretion systems (T6SS) are enriched in A. tumefaciens DRMs.

Virulence-induction
Name Gene UniprotID Function Membrane DSM DRM ratio DRM/DSM [+vir] p-value
marker HflC atu2044 A9CIC9 Modulator of FtsH ± ± ± 8.23 0.002
HflK atu2045 Q7CY01 Modulator of FtsH ± ± ± 3.53 0.024
Atu3772 (QmcA) atu3772 A9CFM5 Probable modulator of FtsH ± ± ± 2.83 0.003
FtsH atu3710 Q7CT50 ATP-dependent zinc metalloprotease ± ± ± 2.92 0.002
vir (T4SS) VirK atu6156 Q7CNV8 VirA/G regulated protein n.i. n.i. n.i.
VirA atu6166 P18540 Two component chemoreceptor + ± Only + vir DRM only 0.027
VirG atu6178 P07545 Two component transcriptional activator + + + 3.07 0.017
VirB2 atu6168 P17792 Pore/pilus like structure Only + vir n.i. Only + vir 0.423
VirB3 atu6169 P17793 Pore/pilus like structure Only + vir n.i. Only + vir DRM only 0.170
VirB4 atu6170 P17794 Pore/pilus like structure + + + 5.37 0.000
VirB5 atu6171 P17795 Pore/pilus like structure Only + vir Only + vir Only + vir DRM only 0.271
VirB6 atu6172 P17796 Pore/pilus like structure n.i. n.i. Only + vir 0.423
VirB7 atu6173 P17797 Pore/pilus like structure Only + vir n.i. + DRM only 0.038
VirB8 atu6174 P17798 Pore/pilus like structure + Only + vir Only + vir 11.04 0.039
VirB9 atu6175 P17799 Pore/pilus like structure + + + 9.70 0.009
VirB10 atu6176 P17800 Pore/pilus like structure + + + 5.89 0.005
VirB11 atu6177 P07169 Pore/pilus like structure + Only + vir + 15.77 0.079
VirC2 atu6179 P07166 DNA binding Only + vir Only + vir + 30.44 0.004
VirC1 atu6180 P07165 DNA binding Only + vir Only + vir Only + vir 2.48 0.076
VirD1 atu6181 P18591 DNA binding, endonuclease Only + vir Only + vir Only + vir 1.39 0.297
VirD2 atu6182 P18592 DNA binding, endonuclease Only + vir Only + vir + 1.78 0.165
VirD3 atu6183 P18593 Unknown + + + 0.16 0.232
VirD4 atu6184 P18594 Coupling factor + + + 7.69 0.068
VirD5 atu6185 A9CL19 Secreted into plant cell ± n.i. ± 0.423
VirE1 atu6189 P08063 Chaperone like protein for VirE2 n.i. n.i. n.i.
VirE2 atu6190 P08062 DNA binding + + + 1.00 0.985
VirE3 atu6188 P08061 Unknown n.i. n.i. Only – vir
VirF atu6154 Q7D2D9 F-box protein n.i. n.i. n.i.
imp (T6SS) TagE (ImpN) atu4330 Q7CUN1 Serine/threonine protein kinase + ± ± DRM only 0.037
TagF (ImpM)* atu4331 Q7CUN2 Serine/threonine phosphoprotein ± + 4.50 0.010
TssM (ImpL) atu4332 A9CGF9 IcmF family protein ± ± ± 3.39 0.029
TssL (ImpK) atu4333 Q7CUN4 OmpA-like porin ± + ± 1.61 0.313
TssK (ImpJ) atu4334 A9CGG0 Unknown ± ± ± 0.47 0.018
TagH (ImpI) atu4335 A9CGG1 Putative fha-domain protein ± ± 4.86 0.010
TssG (ImpH) atu4336 A9CGG2 Unknown + n.i. + DRM only 0.092
TssG (ImpG) atu4337 A9CGG3 Unknown + + + 1.63 0.218
TssF (ImpF) atu4338 Q7CUN9 Unknown Only – vir n.i. ± 0.423
TagJ (ImpE)* atu4339 Q7CUP0 Unknown + + DRM only 0.021
TssC40 (ImpD) atu4340 A9CGG4 Unknown Only + vir Only + vir Only + vir 0.730
TssC41 (ImpC) atu4341 A9CGG5 Pore/pilus like structure ± + + 1.79 0.009
TssB (ImpB) atu4342 A9CGG6 Pore/pilus like structure + + + 1.99 0.317
TssA (ImpA) atu4343 A9CGG7 Unknown ± ± 30.40 0.062
hcp (T6SS) TssH (ClpV) atu4344 Q7CUP5 ATP-dependent Clp protease ± ± 7.13 0.013
TssD (Hcp) atu4345 A9CGG8 Hcp, needle complex 14.44 0.067
Atu4346* atu4346 A9CGG9 Unknown n.i. Only – vir 0.423
Atu4347* atu4347 Q7CUP8 Peptidoglycan amidase ± ± 2.19 0.027
Tssl-1 (VgrG) atu4348 A9CGH0 VgrG protein ± ± ± 1.68 0.019
Atu4349* atu4349 Q7CUQ0 Unknown ± ± + 0.95 0.751
Atu4350* atu4350 A9CGH1 Nuclease + ± + 1.18 0.490
Atu4351* atu4351 Q7CUQ2 Unknown ± ± + 0.98 0.862
Atu4352* atu4352 A9CGH2 Unknown Only + vir Only + vir Only – vir 0.423

Stomatin/prohibitin/flotillin/HflKC proteins and FtsH do not respond to virulence-induction but are significantly enriched within DRMs. Proteins deduced from the vir operon are highly enriched in DRMs of virulence-induced cells. The T6SS consists of the imp and the hcp operon. Proteins encoded by the imp operon show a significant enrichment within the DRMs. For the hcp operon, only TssH, TssD and Atu4347 display a DRM enrichment. Proteins marked with an asterisk are dispensable for T6SS-dependent secretion according to Ma et al. (2014). Protein annotation according to UniProt database and Lin et al. (2013) and Ma et al. (2014). + or –: increased or decreased relative protein amount after virulence-induction; ±: no significant change in relative protein amount; n.i.: protein not identified; Only +/− vir: protein was only identified after/without virulence induction.