7ZXK | pdb_00007zxk

Human IL-27 in complex with neutralizing SRF388 FAb fragment

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
H [auth L]		e7zxkL1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
F [auth I]		e7zxkI1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
G [auth J]		e7zxkJ1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
E [auth H]		e7zxkH1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
D		e7zxkD1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
B		e7zxkB1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
C		e7zxkC1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
A		e7zxkA1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
H [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F [auth I]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
G [auth J]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C	1.20.1250.10	Mainly Alpha	Up-down Bundle	Growth Hormone	Chain: A	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth I], H [auth L]	Light Chain	IGKV4	Kappa	interleukin-27 subunit alpha	SAbDab (2026-03-27)
E [auth H], G [auth J]	Heavy Chain	IGHV3	-	interleukin-27 subunit alpha	SAbDab (2026-03-27)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
F [auth I], H [auth L]	Casdozokitug	IL27	Therapeutic SAbDab (2026-03-27)
E [auth H], G [auth J]	Casdozokitug	IL27	Therapeutic SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, D	PF00041	Fibronectin type III domain (fn3)	Fibronectin type III domain		Domain
B, D	PF24031	IL27B N-terminal FN3 domain (FN3_IL27B_N)	IL27B N-terminal FN3 domain	This entry represents the Fibronectin type III (FN3) domain found at the N-terminal of Interleukin-27 subunit beta (IL27B), from animals. This domain may be found in association with a C-terminal FN3 (Pfam:PF00041). Also known as EBI3, IL27B binds p2 ...	This entry represents the Fibronectin type III (FN3) domain found at the N-terminal of Interleukin-27 subunit beta (IL27B), from animals. This domain may be found in association with a C-terminal FN3 (Pfam:PF00041). Also known as EBI3, IL27B binds p28 to form the heterodimeric cytokine IL-27, which plays an important role in innate immunity by inducing naive CD4+ T cells proliferation [1]. IL-27 binds GP130 and IL-27Ra, acting as a bridge, to activate the JAK/STAT signaling cascade. EBI3 stabilizes the complex by binding a positively charged surface of IL-27Ra and Domain 1 of GP130 [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F [auth I], H [auth L]	SRF388 Light Chain	-	-	-
E [auth H], G [auth J]	SRF388 Heavy Chain	-	-	-
B, D	Interleukin-27 subunit beta	molecular transducer activity transmembrane signaling receptor activity signaling receptor activity cytokine receptor activity immune receptor activity molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity protein binding binding signaling receptor binding molecular transducer activity transmembrane signaling receptor activity signaling receptor activity cytokine receptor activity immune receptor activity molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity protein binding binding signaling receptor binding interleukin-27 receptor binding cytokine receptor binding	multicellular organismal process cell population proliferation cell activation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process T cell activation lymphocyte proliferation cellular process T cell proliferation humoral immune response response to stimulus multicellular organismal process cell population proliferation cell activation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process T cell activation lymphocyte proliferation cellular process T cell proliferation humoral immune response response to stimulus immune response adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains T-helper 1 type immune response adaptive immune response regulation of cellular process positive regulation of cell population proliferation regulation of leukocyte activation regulation of alpha-beta T cell activation positive regulation of alpha-beta T cell proliferation regulation of cell activation positive regulation of cell activation alpha-beta T cell proliferation positive regulation of leukocyte activation alpha-beta T cell activation regulation of immune system process positive regulation of immune system process regulation of leukocyte proliferation regulation of biological process positive regulation of T cell activation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation positive regulation of alpha-beta T cell activation regulation of cell population proliferation regulation of leukocyte cell-cell adhesion positive regulation of leukocyte proliferation positive regulation of multicellular organismal process positive regulation of biological process positive regulation of leukocyte cell-cell adhesion leukocyte cell-cell adhesion positive regulation of cell-cell adhesion regulation of alpha-beta T cell proliferation positive regulation of lymphocyte activation cell adhesion cell-cell adhesion positive regulation of mononuclear cell proliferation regulation of multicellular organismal process regulation of cell-cell adhesion positive regulation of cellular process regulation of lymphocyte proliferation positive regulation of cell adhesion regulation of cell adhesion biological regulation regulation of T cell activation regulation of T cell proliferation regulation of mononuclear cell proliferation regulation of lymphocyte activation regulation of type II interferon production type II interferon production positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process cytokine production regulation of cytokine production positive regulation of macromolecule metabolic process regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of type II interferon production regulation of gene expression biosynthetic process positive regulation of gene expression metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process	membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle cellular anatomical structure organelle lumen organelle endoplasmic reticulum cytoplasm extracellular region membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle cellular anatomical structure organelle lumen organelle endoplasmic reticulum cytoplasm extracellular region cell periphery plasma membrane membrane extracellular space
A, C	Interleukin-27 subunit alpha	protein binding binding signaling receptor binding molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity interleukin-27 receptor binding cytokine receptor binding	multicellular organismal process regulation of cellular process regulation of leukocyte activation regulation of cell activation lymphocyte activation leukocyte proliferation leukocyte activation T cell activation lymphocyte proliferation regulation of immune system process regulation of multicellular organismal process T cell proliferation regulation of lymphocyte proliferation regulation of leukocyte proliferation multicellular organismal process regulation of cellular process regulation of leukocyte activation regulation of cell activation lymphocyte activation leukocyte proliferation leukocyte activation T cell activation lymphocyte proliferation regulation of immune system process regulation of multicellular organismal process T cell proliferation regulation of lymphocyte proliferation regulation of leukocyte proliferation regulation of biological process cell population proliferation biological regulation cell activation regulation of T cell activation regulation of T cell proliferation regulation of cell population proliferation mononuclear cell proliferation immune system process regulation of mononuclear cell proliferation cellular process regulation of lymphocyte activation regulation of defense response regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms response to stimulus regulation of response to external stimulus defense response response to other organism response to external stimulus response to biotic stimulus regulation of defense response to virus defense response to virus regulation of response to stimulus response to stress regulation of response to stress positive regulation of defense response to virus by host regulation of defense response to virus by host response to external biotic stimulus response to virus adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of immune effector process regulation of leukocyte differentiation regulation of alpha-beta T cell activation mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation cell activation involved in immune response regulation of cell development multicellular organism development cell differentiation anatomical structure development regulation of T-helper cell differentiation alpha-beta T cell activation T cell differentiation developmental process T-helper cell differentiation immune response regulation of adaptive immune response T-helper 1 type immune response regulation of T-helper 1 type immune response immune effector process regulation of immune response regulation of T-helper 1 cell differentiation leukocyte differentiation cellular developmental process regulation of developmental process cell development regulation of CD4-positive, alpha-beta T cell differentiation regulation of alpha-beta T cell differentiation CD4-positive, alpha-beta T cell differentiation regulation of T cell differentiation alpha-beta T cell differentiation regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains T cell activation involved in immune response alpha-beta T cell activation involved in immune response CD4-positive, alpha-beta T cell activation leukocyte activation involved in immune response lymphocyte activation involved in immune response regulation of lymphocyte differentiation regulation of multicellular organismal development hemopoiesis T cell differentiation involved in immune response adaptive immune response regulation of CD4-positive, alpha-beta T cell activation T-helper 1 cell differentiation regulation of hemopoiesis inflammatory response defense response to symbiont defense response to other organism innate immune response response to bacterium response to Gram-positive bacterium regulation of type II interferon production type II interferon production positive regulation of biological process positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process cytokine production regulation of cytokine production positive regulation of macromolecule metabolic process positive regulation of cellular process regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of type II interferon production regulation of gene expression biosynthetic process positive regulation of gene expression positive regulation of multicellular organismal process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process	membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle cellular anatomical structure organelle lumen organelle endoplasmic reticulum cytoplasm extracellular region membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle cellular anatomical structure organelle lumen organelle endoplasmic reticulum cytoplasm extracellular region cell surface cytosol extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, D	IPR003961	Fibronectin type III	Domain
B, D	IPR003530	Long hematopoietin receptor, soluble alpha chain, conserved site	Conserved Site
B, D	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B, D	IPR056621	IL27B, N-terminal Fn3 domain	Domain
B, D	IPR036116	Fibronectin type III superfamily	Homologous Superfamily
B, D	IPR053073	Interleukin-11/Interleukin-27 subunit beta	Family
A, C	IPR026207	Interleukin-27 alpha	Family
A, C	IPR009079	Four-helical cytokine-like, core	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B, D	Pharos: Q14213	gastric cancer interstitial cystitis osteosarcoma gastric neoplasm malignant mesothelioma psoriasis hereditary diffuse gastric adenocarcinoma Malignant neoplasm of stomach
A, C	Pharos: Q8NEV9	prostate cancer allergic rhinitis bipolar disorder chronic obstructive pulmonary disease Diabetes Mellitus, Ketosis-Prone ankylosing spondylitis breast cancer Crohn disease attention deficit hyperactivity disorder, inattentive type inflammatory bowel disease type 1 diabetes mellitus

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.