Phylogenetic relationship of ParA proteins from 20 actinobacterial plasmids. ParAs and their predicted homologs are designated by the name of the plasmid on which they reside. The subscript identifies the genus of the bacterium in which the plasmid resides (first letter) and either the first two letters of the species or the strain number. Linear plasmids are underscored. Bootstrap values of major, stable nodes are indicated as percentages. ParA sequences from the following plasmids were included in the analysis: pGKT1, Gordonia sp. KTR9; pGKT2, Gordonia sp. KTR9; pGKT3, Gordonia sp. KTR9; pKB1, G. westfalica strain DSM 44215T (gi|40217320); pGBRO01, Gordonia bronchialis DSM 43247 (gi|262118119); pSCP1_a2, Streptomyces coelicolor A3(2) (gi|21234217); pCLP, Mycobacterium celatum, (gi|32455743); pMUM001, Mycobacterium ulcerans, (gi|42414723); pNF1, Nocardia farcinica IFM 10152 (gi|54027649); p103, Rhodococcus equi 103 (gi|10657915); pFAJ2600, Rhodococcus erythropolis NI86/21 (gi|2460009); pPBD2, R. erythropolis BD2 (gi|33867067); pREC1, R. erythropolis PR4 (gi|77404542); pREL1, R. erythropolis PR4 (gi|77454578); pRHL1, R. jostii RHA1, (gi|111025387); pRHL2, R. jostii RHA1, (gi|111026081); pRHL3, R. jostii RHA1, (gi|111027090); pSLA2-L, Streptomyces rochei 7434-AN4 (gi|30795070); pFP11, Streptomyces sp. F11 (gi|62184581); pFP1, Streptomyces sp. FQ1 (gi|62184597); pSV2, Streptomyces violaceoruber ANK95570 (gi|32455643). The predicted ParAs of pGKT1 and pKB1 have identical sequences.