Orf13_p is a component of Tra_p T4SS. Orf13_p is probably a channel component

Proteins belonging to this kind of component are listed
(You can select < 50 proteins to perform sequence alignment by MUSCLE)
#ComponentProtein ID T4SS Accession Organism
1 Orf13_p269124265Tra_pNC_013514Enterococcus faecalis plasmid pAMbeta1 (NC_013514)
2 Orf13_p115534839Tra_pNC_008445Enterococcus faecalis plasmid pRE25 (NC_008445)
3 Orf13_p63022002Tra_pNC_006979Streptococcus pyogenes plasmid pSM19035 (NC_006979)
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Multiple protein sequence alignment by MUSCLE online