Crystal structure of the Fab fragment of the anti-IL-6 antibody I9H in complex with a domain-swapped IL-6 dimer
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
| Chains | Type | Family Name | Domain Identifier | Family Identifier | Provenance Source (Version) |
|---|---|---|---|---|---|
| C [auth A] | SCOP2B Superfamily | 4-helical cytokines | 8037068 | 3001717 | SCOP2B (2022-06-29) |
Domain Annotation: ECOD Classification ECOD Database Homepage
| Chains | Family Name | Domain Identifier | Architecture | Possible Homology | Homology | Topology | Family | Provenance Source (Version) |
|---|---|---|---|---|---|---|---|---|
| C [auth A] | WD40 | e8ywqA1 | A: beta barrels | X: cradle loop barrel | H: RIFT-related | T: acid protease | F: WD40 | ECOD (v294.2) |
| B [auth L] | WD40 | e8ywqL1 | A: beta barrels | X: cradle loop barrel | H: RIFT-related | T: acid protease | F: WD40 | ECOD (v294.2) |
| A [auth H] | WD40 | e8ywqH1 | A: beta barrels | X: cradle loop barrel | H: RIFT-related | T: acid protease | F: WD40 | ECOD (v294.2) |
SAbDab Antibody Annotation SAbDab Database Homepage
| Chain | Chain Class | Chain Subclass | Chain Type | Antigen Name(s) | Provenance Source |
|---|---|---|---|---|---|
| B [auth L] | Light Chain | IGKV1 | Kappa | interleukin-6 | SAbDab (2026-06-05) |
| A [auth H] | Heavy Chain | IGHV2 | - | interleukin-6 | SAbDab (2026-06-05) |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
| Chains | Accession | Name | Type |
|---|---|---|---|
| C [auth A] | IPR030473 | Interleukin-6/GCSF/MGF, conserved site | Conserved Site |
| C [auth A] | IPR009079 | Four-helical cytokine-like, core | Homologous Superfamily |
| C [auth A] | IPR003574 | Interleukin-6-like | Family |
| C [auth A] | IPR030474 | Interleukin-6/GCSF/MGF | Family |














