Table 1.

Putative T6SS loci, Hcp proteins, and PAAR motif-containing proteins identified in the Y. pestis genome.

Cluster name and location	Putative Hcp proteins (% identity to Hcp of A. dhakensis)	PAAR motif-containing proteins and their biologically-active domains
A: ypo0498-ypo0518	Hcp1: YPO0973 (31%); part of Cluster B	YPO0762 tRNA nuclease (WapA)
B: ypo0966-ypo0984	Hcp2: YPO1470 (31%);part of Cluster C	YPO0866
C: ypo1458-ypo1493	Hcp3: YPO2793 (32%)	YPO0873 pyocin S type
E: ypo2715-ypo2733	Hcp4: YPO2868 (34%)	YPO1484 Toxin 60 (RNase toxin)
F: ypo2927-ypo2954	Hcp5: YPO2962 (32%)	YPO3615 tRNA nuclease (WapA)
G: ypo3588-ypo3615	Hcp6: YPO3708 (82%)