| PF00512 | His Kinase A (phospho-acceptor) domain (HisKA) | His Kinase A (phospho-acceptor) domain | Dimerisation and phospho-acceptor domain of histidine kinases. | Domain |
| PF02518 | Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase (HATPase_c) | Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase | This family represents the structurally related ATPase domains of histidine kinase, DNA gyrase B and HSP90. | Domain |
| PF00512 | His Kinase A (phospho-acceptor) domain (HisKA) | His Kinase A (phospho-acceptor) domain | Dimerisation and phospho-acceptor domain of histidine kinases. | Domain |
| PF02518 | Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase (HATPase_c) | Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase | This family represents the structurally related ATPase domains of histidine kinase, DNA gyrase B and HSP90. | Domain |