Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad2ahma1 All alpha proteins immunoglobulin/albumin-binding domain-like Coronavirus NSP7-like Coronavirus NSP7-like Nonstructural protein 7, NSP7 (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Ad2ahma2 Artifacts Tags Tags Tags N-terminal Tags (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Bd2ahmb2 All alpha proteins immunoglobulin/albumin-binding domain-like Coronavirus NSP7-like Coronavirus NSP7-like automated matches (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Bd2ahmb3 Artifacts Tags Tags Tags N-terminal Tags (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Cd2ahmc2 All alpha proteins immunoglobulin/albumin-binding domain-like Coronavirus NSP7-like Coronavirus NSP7-like automated matches (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Cd2ahmc3 Artifacts Tags Tags Tags N-terminal Tags (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Dd2ahmd2 All alpha proteins immunoglobulin/albumin-binding domain-like Coronavirus NSP7-like Coronavirus NSP7-like automated matches (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Dd2ahmd3 Artifacts Tags Tags Tags N-terminal Tags (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Ed2ahme1 Alpha and beta proteins (a+b) Coronavirus NSP8-like Coronavirus NSP8-like Coronavirus NSP8-like Nonstructural protein 8, NSP8 (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Hd2ahmh1 Alpha and beta proteins (a+b) Coronavirus NSP8-like Coronavirus NSP8-like Coronavirus NSP8-like Nonstructural protein 8, NSP8 (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Fd2ahmf_ Alpha and beta proteins (a+b) Coronavirus NSP8-like Coronavirus NSP8-like Coronavirus NSP8-like Nonstructural protein 8, NSP8 (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)
Gd2ahmg1 Alpha and beta proteins (a+b) Coronavirus NSP8-like Coronavirus NSP8-like Coronavirus NSP8-like Nonstructural protein 8, NSP8 (Severe acute respiratory syndrome-related coronavirus ) [TaxId: 694009 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilySARS coronavirus NSP7-like8024640 4001186 SCOP2 (2022-06-29)
ASCOP2 SuperfamilySARS coronavirus NSP7-like8037019 3001013 SCOP2 (2022-06-29)
BSCOP2B SuperfamilySARS coronavirus NSP7-like8037019 3001013 SCOP2B (2022-06-29)
CSCOP2B SuperfamilySARS coronavirus NSP7-like8037019 3001013 SCOP2B (2022-06-29)
DSCOP2B SuperfamilySARS coronavirus NSP7-like8037019 3001013 SCOP2B (2022-06-29)
ESCOP2 FamilySARS coronavirus NSP8-like8024642 4003431 SCOP2 (2022-06-29)
ESCOP2 SuperfamilySARS coronavirus NSP8-like8037021 3000855 SCOP2 (2022-06-29)
HSCOP2B SuperfamilySARS coronavirus NSP8-like8037021 3000855 SCOP2B (2022-06-29)
FSCOP2B SuperfamilySARS coronavirus NSP8-like8037021 3000855 SCOP2B (2022-06-29)
GSCOP2B SuperfamilySARS coronavirus NSP8-like8037021 3000855 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APF08716e2ahmA1 A: alpha bundlesX: immunoglobulin/albumin-binding domain-likeH: Coronavirus NSP7-like (From Topology)T: Coronavirus NSP7-likeF: PF08716ECOD (1.6)
BPF08716e2ahmB1 A: alpha bundlesX: immunoglobulin/albumin-binding domain-likeH: Coronavirus NSP7-like (From Topology)T: Coronavirus NSP7-likeF: PF08716ECOD (1.6)
CPF08716e2ahmC1 A: alpha bundlesX: immunoglobulin/albumin-binding domain-likeH: Coronavirus NSP7-like (From Topology)T: Coronavirus NSP7-likeF: PF08716ECOD (1.6)
DPF08716e2ahmD1 A: alpha bundlesX: immunoglobulin/albumin-binding domain-likeH: Coronavirus NSP7-like (From Topology)T: Coronavirus NSP7-likeF: PF08716ECOD (1.6)
EPF08717e2ahmE1 A: beta barrelsX: Coronavirus NSP8-like (From Topology)H: Coronavirus NSP8-like (From Topology)T: Coronavirus NSP8-likeF: PF08717ECOD (1.6)
HPF08717e2ahmH1 A: beta barrelsX: Coronavirus NSP8-like (From Topology)H: Coronavirus NSP8-like (From Topology)T: Coronavirus NSP8-likeF: PF08717ECOD (1.6)
FPF08717e2ahmF1 A: beta barrelsX: Coronavirus NSP8-like (From Topology)H: Coronavirus NSP8-like (From Topology)T: Coronavirus NSP8-likeF: PF08717ECOD (1.6)
GPF08717e2ahmG1 A: beta barrelsX: Coronavirus NSP8-like (From Topology)H: Coronavirus NSP8-like (From Topology)T: Coronavirus NSP8-likeF: PF08717ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C, D
PF08716Coronavirus replicase NSP7 (CoV_NSP7)Coronavirus replicase NSP7NSP7 (non structural protein 7) has been implicated in viral RNA replication and is predominantly alpha helical in structure [1]. It forms a hexadecameric supercomplex with NSP8 that adopts a hollow cylinder-like structure [2]. The dimensions of the ...NSP7 (non structural protein 7) has been implicated in viral RNA replication and is predominantly alpha helical in structure [1]. It forms a hexadecameric supercomplex with NSP8 that adopts a hollow cylinder-like structure [2]. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase [2]. NSP7 and NSP8 heterodimers play a role in the stabilisation of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex [3].
Domain
E, F, G, H
PF08717Coronavirus replicase NSP8 (CoV_NSP8)Coronavirus replicase NSP8Viral NSP8 (non structural protein 8) forms a hexadecameric supercomplex with NSP7 that adopts a hollow cylinder-like structure [1]. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers pro ...Viral NSP8 (non structural protein 8) forms a hexadecameric supercomplex with NSP7 that adopts a hollow cylinder-like structure [1]. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase [1]. NSP7 and NSP8 heterodimers play a role in the stabilisation of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex [2]. It has been demonstrated that NSP8 acts as an oligo(U)-templated polyadenylyltransferase but also has robust (mono/oligo) adenylate transferase activities [3]. NSP8 has N- and C-terminal D/ExD/E conserved motifs, being the N-terminal motif critical for RNA polymerase activity as these residues are part of the Mg2-binding active site [4].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C, D
Replicase polyprotein 1ab, light chain
E, F, G, H
Replicase polyprotein 1ab, heavy chain

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A, B, C, D
IPR022733DPUP/SUD, C-terminal, betacoronavirusDomain
A, B, C, D
IPR042515Non-structural protein NSP15, N-terminal domain superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR043174Non-structural protein NSP15, middle domain superfamilyHomologous Superfamily
A, B, C, D
IPR044315Nonstructural protein 14, betacoronavirusDomain
A, B, C, D
IPR038123Non-structural protein NSP4, C-terminal superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR042570Non-structural protein NSP3, nucleic acid-binding domain superfamily, betacoronavirusHomologous Superfamily
A, B, C, D
IPR043178Papain-like protease, thumb domain superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR046441RNA-dependent RNA polymerase, coronavirusDomain
A, B, C, D
IPR044863Nidovirus RdRp-associated nucleotidyl transferase (NiRAN) domainDomain
A, B, C, D
IPR044343Nonstructural protein 13, 1B domain, coronavirusDomain
A, B, C, D
IPR038166Polyprotein cleavage domain PL2pro superfamily, betacoronavirusHomologous Superfamily
A, B, C, D
IPR037227Endoribonuclease EndoU-likeHomologous Superfamily
A, B, C, D
IPR027352Nonstructural protein 13, zinc-binding domain, coronavirus-likeDomain
A, B, C, D
IPR009003Peptidase S1, PA clanHomologous Superfamily
A, B, C, D
IPR013016Peptidase C16, coronavirusDomain
A, B, C, D
IPR009466Non-structural protein 14, coronavirusDomain
A, B, C, D
IPR044357NSP3, first ubiquitin-like (Ubl) domain, coronavirusDomain
A, B, C, D
IPR046436Nidovirus 3'-5' exoribonuclease domainDomain
A, B, C, D
IPR047570NSP12, interface domain, coronavirusDomain
A, B, C, D
IPR018995RNA synthesis protein NSP10, coronavirusDomain
A, B, C, D
IPR043615Nonstructural protein 2, N-terminal domain, coronavirusDomain
A, B, C, D
IPR043177Papain-like protease, N-terminal domain superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR043606Coronavirus replicase NSP15, N-terminal oligomerizationDomain
A, B, C, D
IPR044330Nonstructural protein 15, N-terminal domain, alpha/beta-coronavirusDomain
A, B, C, D
IPR041679DNA2/NAM7 helicase-like, C-terminalDomain
A, B, C, D
IPR024375Non-structural protein NSP3, SUD-M domain, betacoronavirusDomain
A, B, C, D
IPR014828Non-structural protein NSP7, coronavirusDomain
A, B, C, D
IPR043503Papain-like viral protease, palm and finger domains, coronavirusHomologous Superfamily
A, B, C, D
IPR014829Non-structural protein NSP8, coronavirusDomain
A, B, C, D
IPR036499Non-structural protein NSP9 superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR029063S-adenosyl-L-methionine-dependent methyltransferase superfamilyHomologous Superfamily
A, B, C, D
IPR044389Non-structural protein 2, SARS-CoV-likeDomain
A, B, C, D
IPR043502DNA/RNA polymerase superfamilyHomologous Superfamily
A, B, C, D
IPR008740Peptidase C30, coronavirusDomain
A, B, C, D
IPR036333RNA synthesis protein NSP10 superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR047573Non-structural protein 2, middle domain, coronavirusDomain
A, B, C, D
IPR043472Macro domain-likeHomologous Superfamily
A, B, C, D
IPR043609NendoU domain, nidovirusDomain
A, B, C, D
IPR032592Non-structural protein NSP3, nucleic acid-binding domain, betacoronavirusDomain
A, B, C, D
IPR043613Non-structural protein 2, C-terminal domain, coronavirusDomain
A, B, C, D
IPR038083Non-structural protein NSP3A domain-like superfamilyHomologous Superfamily
A, B, C, D
IPR043504Peptidase S1, PA clan, chymotrypsin-like foldHomologous Superfamily
A, B, C, D
IPR044351RNA-dependent RNA polymerase, SARS-CoV-likeDomain
A, B, C, D
IPR024358Non-structural protein NSP3, N-terminal, betacoronavirusDomain
A, B, C, D
IPR048673Nonstructural protein 13, stalk domain, coronavirusDomain
A, B, C, D
IPR046435NSP14, guanine-N7-methyltransferase domain, coronavirusDomain
A, B, C, D
IPR009469RNA-dependent RNA polymerase, N-terminal, coronavirusDomain
A, B, C, D
IPR043611Coronavirus replicase NSP3, C-terminalDomain
A, B, C, D
IPR044864Non-structural protein NSP3, SUD-N (Mac2) domain, betacoronavirusDomain
A, B, C, D
IPR047566Coronavirus replicase NSP3, Y domainDomain
A, B, C, D
IPR048672Nonstructural protein 13, zinc-binding domain, coronavirusDomain
A, B, C, D
IPR043612Non-structural protein NSP4, N-terminal, coronavirusDomain
A, B, C, D
IPR027417P-loop containing nucleoside triphosphate hydrolaseHomologous Superfamily
A, B, C, D
IPR043608Nonstructural protein 15, middle domain, coronavirusDomain
A, B, C, D
IPR044353NSP3, second ubiquitin-like (Ubl) domain, coronavirusDomain
A, B, C, D
IPR037204Non-structural protein NSP7 superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR044374Non-structural protein 3, SUD-N macrodomain, SARS-CoVDomain
A, B, C, D
IPR046443NSP1, globular domain, alpha/betacoronavirusDomain
A, B, C, D
IPR043610Non-structural protein 6, coronavirusDomain
A, B, C, D
IPR027351(+) RNA virus helicase core domainDomain
A, B, C, D
IPR044322Nonstructural protein 15, middle domain, alpha/betacoronavirusDomain
A, B, C, D
IPR009461Non-structural protein NSP16, coronavirus-likeDomain
A, B, C, D
IPR043477Peptidase C30, domain 3, coronavirusHomologous Superfamily
A, B, C, D
IPR043478Non-structural protein NSP3, SUD-N (Mac2) domain superfamily, betacoronavirusHomologous Superfamily
A, B, C, D
IPR038400Non-structural protein NSP3, SUD-M domain superfamily, betacoronavirusHomologous Superfamily
A, B, C, D
IPR046442NSP1, C-terminal domain, betacoronavirusDomain
A, B, C, D
IPR001205RNA-directed RNA polymerase, C-terminal domainDomain
A, B, C, D
IPR044401NSP15, NendoU domain, coronavirusDomain
A, B, C, D
IPR014822Non-structural protein NSP9, coronavirusDomain
A, B, C, D
IPR038030NSP1 globular domain superfamily, betacoronavirusHomologous Superfamily
A, B, C, D
IPR021590NSP1, globular domain, betacoronavirusDomain
A, B, C, D
IPR044367Non-structural protein 6, betacoronavirusDomain
A, B, C, D
IPR037230Non-structural protein NSP8 superfamily, coronavirusHomologous Superfamily
A, B, C, D
IPR046440Arterivirus Nsp11 N-terminal/Coronavirus NSP15 middle domainDomain
A, B, C, D
IPR032505Non-structural protein NSP4, C-terminal, coronavirusDomain
A, B, C, D
IPR046438Nidovirus 2-O-methyltransferaseDomain
A, B, C, D
IPR002589Macro domainDomain
A, B, C, D
IPR047567Non-structural protein NSP3, group 2-specific marker domain, betacoronavirusDomain
A, B, C, D
IPR044371Non-structural protein 3, X-domain-likeDomain
A, B, C, D
IPR007094RNA-directed RNA polymerase, catalytic domainDomain
E, F, G, H
IPR022733DPUP/SUD, C-terminal, betacoronavirusDomain
E, F, G, H
IPR042515Non-structural protein NSP15, N-terminal domain superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR043174Non-structural protein NSP15, middle domain superfamilyHomologous Superfamily
E, F, G, H
IPR044315Nonstructural protein 14, betacoronavirusDomain
E, F, G, H
IPR038123Non-structural protein NSP4, C-terminal superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR042570Non-structural protein NSP3, nucleic acid-binding domain superfamily, betacoronavirusHomologous Superfamily
E, F, G, H
IPR043178Papain-like protease, thumb domain superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR046441RNA-dependent RNA polymerase, coronavirusDomain
E, F, G, H
IPR044863Nidovirus RdRp-associated nucleotidyl transferase (NiRAN) domainDomain
E, F, G, H
IPR044343Nonstructural protein 13, 1B domain, coronavirusDomain
E, F, G, H
IPR038166Polyprotein cleavage domain PL2pro superfamily, betacoronavirusHomologous Superfamily
E, F, G, H
IPR037227Endoribonuclease EndoU-likeHomologous Superfamily
E, F, G, H
IPR027352Nonstructural protein 13, zinc-binding domain, coronavirus-likeDomain
E, F, G, H
IPR009003Peptidase S1, PA clanHomologous Superfamily
E, F, G, H
IPR013016Peptidase C16, coronavirusDomain
E, F, G, H
IPR009466Non-structural protein 14, coronavirusDomain
E, F, G, H
IPR044357NSP3, first ubiquitin-like (Ubl) domain, coronavirusDomain
E, F, G, H
IPR046436Nidovirus 3'-5' exoribonuclease domainDomain
E, F, G, H
IPR047570NSP12, interface domain, coronavirusDomain
E, F, G, H
IPR018995RNA synthesis protein NSP10, coronavirusDomain
E, F, G, H
IPR043615Nonstructural protein 2, N-terminal domain, coronavirusDomain
E, F, G, H
IPR043177Papain-like protease, N-terminal domain superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR043606Coronavirus replicase NSP15, N-terminal oligomerizationDomain
E, F, G, H
IPR044330Nonstructural protein 15, N-terminal domain, alpha/beta-coronavirusDomain
E, F, G, H
IPR041679DNA2/NAM7 helicase-like, C-terminalDomain
E, F, G, H
IPR024375Non-structural protein NSP3, SUD-M domain, betacoronavirusDomain
E, F, G, H
IPR014828Non-structural protein NSP7, coronavirusDomain
E, F, G, H
IPR043503Papain-like viral protease, palm and finger domains, coronavirusHomologous Superfamily
E, F, G, H
IPR014829Non-structural protein NSP8, coronavirusDomain
E, F, G, H
IPR036499Non-structural protein NSP9 superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR029063S-adenosyl-L-methionine-dependent methyltransferase superfamilyHomologous Superfamily
E, F, G, H
IPR044389Non-structural protein 2, SARS-CoV-likeDomain
E, F, G, H
IPR043502DNA/RNA polymerase superfamilyHomologous Superfamily
E, F, G, H
IPR008740Peptidase C30, coronavirusDomain
E, F, G, H
IPR036333RNA synthesis protein NSP10 superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR047573Non-structural protein 2, middle domain, coronavirusDomain
E, F, G, H
IPR043472Macro domain-likeHomologous Superfamily
E, F, G, H
IPR043609NendoU domain, nidovirusDomain
E, F, G, H
IPR032592Non-structural protein NSP3, nucleic acid-binding domain, betacoronavirusDomain
E, F, G, H
IPR043613Non-structural protein 2, C-terminal domain, coronavirusDomain
E, F, G, H
IPR038083Non-structural protein NSP3A domain-like superfamilyHomologous Superfamily
E, F, G, H
IPR043504Peptidase S1, PA clan, chymotrypsin-like foldHomologous Superfamily
E, F, G, H
IPR044351RNA-dependent RNA polymerase, SARS-CoV-likeDomain
E, F, G, H
IPR024358Non-structural protein NSP3, N-terminal, betacoronavirusDomain
E, F, G, H
IPR048673Nonstructural protein 13, stalk domain, coronavirusDomain
E, F, G, H
IPR046435NSP14, guanine-N7-methyltransferase domain, coronavirusDomain
E, F, G, H
IPR009469RNA-dependent RNA polymerase, N-terminal, coronavirusDomain
E, F, G, H
IPR043611Coronavirus replicase NSP3, C-terminalDomain
E, F, G, H
IPR044864Non-structural protein NSP3, SUD-N (Mac2) domain, betacoronavirusDomain
E, F, G, H
IPR047566Coronavirus replicase NSP3, Y domainDomain
E, F, G, H
IPR048672Nonstructural protein 13, zinc-binding domain, coronavirusDomain
E, F, G, H
IPR043612Non-structural protein NSP4, N-terminal, coronavirusDomain
E, F, G, H
IPR027417P-loop containing nucleoside triphosphate hydrolaseHomologous Superfamily
E, F, G, H
IPR043608Nonstructural protein 15, middle domain, coronavirusDomain
E, F, G, H
IPR044353NSP3, second ubiquitin-like (Ubl) domain, coronavirusDomain
E, F, G, H
IPR037204Non-structural protein NSP7 superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR044374Non-structural protein 3, SUD-N macrodomain, SARS-CoVDomain
E, F, G, H
IPR046443NSP1, globular domain, alpha/betacoronavirusDomain
E, F, G, H
IPR043610Non-structural protein 6, coronavirusDomain
E, F, G, H
IPR027351(+) RNA virus helicase core domainDomain
E, F, G, H
IPR044322Nonstructural protein 15, middle domain, alpha/betacoronavirusDomain
E, F, G, H
IPR009461Non-structural protein NSP16, coronavirus-likeDomain
E, F, G, H
IPR043477Peptidase C30, domain 3, coronavirusHomologous Superfamily
E, F, G, H
IPR043478Non-structural protein NSP3, SUD-N (Mac2) domain superfamily, betacoronavirusHomologous Superfamily
E, F, G, H
IPR038400Non-structural protein NSP3, SUD-M domain superfamily, betacoronavirusHomologous Superfamily
E, F, G, H
IPR046442NSP1, C-terminal domain, betacoronavirusDomain
E, F, G, H
IPR001205RNA-directed RNA polymerase, C-terminal domainDomain
E, F, G, H
IPR044401NSP15, NendoU domain, coronavirusDomain
E, F, G, H
IPR014822Non-structural protein NSP9, coronavirusDomain
E, F, G, H
IPR038030NSP1 globular domain superfamily, betacoronavirusHomologous Superfamily
E, F, G, H
IPR021590NSP1, globular domain, betacoronavirusDomain
E, F, G, H
IPR044367Non-structural protein 6, betacoronavirusDomain
E, F, G, H
IPR037230Non-structural protein NSP8 superfamily, coronavirusHomologous Superfamily
E, F, G, H
IPR046440Arterivirus Nsp11 N-terminal/Coronavirus NSP15 middle domainDomain
E, F, G, H
IPR032505Non-structural protein NSP4, C-terminal, coronavirusDomain
E, F, G, H
IPR046438Nidovirus 2-O-methyltransferaseDomain
E, F, G, H
IPR002589Macro domainDomain
E, F, G, H
IPR047567Non-structural protein NSP3, group 2-specific marker domain, betacoronavirusDomain
E, F, G, H
IPR044371Non-structural protein 3, X-domain-likeDomain
E, F, G, H
IPR007094RNA-directed RNA polymerase, catalytic domainDomain