| IPR036555 | NusA, N-terminal domain superfamily | Homologous Superfamily |
| IPR003029 | S1 domain | Domain |
| IPR013735 | Transcription factor NusA, N-terminal | Domain |
| IPR059158 | NusA, second KH domain, bacteria | Domain |
| IPR059258 | Transcription factor NusA, bacteria | Family |
| IPR009019 | K homology domain superfamily, prokaryotic type | Homologous Superfamily |
| IPR004087 | K Homology domain | Domain |
| IPR010213 | Transcription factor NusA | Domain |
| IPR015946 | K homology domain-like, alpha/beta | Homologous Superfamily |
| IPR025249 | Transcription factor NusA, first KH domain | Domain |
| IPR030842 | Transcription factor NusA, prokaryotes | Family |
| IPR058582 | NusA-like, second KH domain | Domain |
| IPR012340 | Nucleic acid-binding, OB-fold | Homologous Superfamily |
| IPR007642 | RNA polymerase Rpb2, domain 2 | Domain |
| IPR015712 | DNA-directed RNA polymerase, subunit 2 | Family |
| IPR037033 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily | Homologous Superfamily |
| IPR037034 | RNA polymerase Rpb2, domain 2 superfamily | Homologous Superfamily |
| IPR007120 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain | Domain |
| IPR007121 | RNA polymerase, beta subunit, conserved site | Conserved Site |
| IPR007645 | RNA polymerase Rpb2, domain 3 | Domain |
| IPR014724 | RNA polymerase Rpb2, OB-fold | Homologous Superfamily |
| IPR019462 | DNA-directed RNA polymerase, beta subunit, external 1 domain | Domain |
| IPR010243 | DNA-directed RNA polymerase beta subunit, bacterial-type | Family |
| IPR007644 | RNA polymerase, beta subunit, protrusion | Domain |
| IPR007641 | RNA polymerase Rpb2, domain 7 | Domain |