4YUE | pdb_00004yue

Mouse IL-2 Bound to S4B6 Fab Fragment

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth H]	V-set	e4yueH2	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (v294.1)
A [auth H]	EF-hand_1, EF-hand_6, EF-hand_7	e4yueH1	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (v294.1)
B [auth L]	V-set	e4yueL1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (v294.1)
C	V-set	e4yueC1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	1.20.1250.10	Mainly Alpha	Up-down Bundle	Growth Hormone	Chain: A	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
A [auth H]	S4B6 Fab	VH-CH1	Rattus norvegicus (Norway rat)	IGHV1-1601, IGHJ301, IGHG2A*01	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-2A_KAPPA	IMGT (202613-0)
B [auth L]	S4B6 Fab	L-KAPPA	Rattus norvegicus (Norway rat)	IGKV12S2401, IGKJ2-301, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-2A_KAPPA	IMGT (202613-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth H]	Heavy Chain	IGHV1	-	interleukin-2	SAbDab (2026-04-10)
B [auth L]	Light Chain	IGKV12	Kappa	interleukin-2	SAbDab (2026-04-10)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C	PF00715	Interleukin 2 (IL2)	Interleukin 2		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth H]	S4B6 Fab heavy chain	-	-	-
B [auth L]	S4B6 Fab light chain	-	-	-
C	Interleukin-2	glycosphingolipid binding binding sphingolipid binding lipid binding glycolipid binding carbohydrate derivative binding molecular function activator activity molecular function regulator activity signaling receptor regulator activity growth factor activity receptor ligand activity signaling receptor activator activity carbohydrate binding protein binding glycosphingolipid binding binding sphingolipid binding lipid binding glycolipid binding carbohydrate derivative binding molecular function activator activity molecular function regulator activity signaling receptor regulator activity growth factor activity receptor ligand activity signaling receptor activator activity carbohydrate binding protein binding kappa-type opioid receptor binding signaling receptor binding G protein-coupled receptor binding opioid receptor binding cytokine activity cytokine receptor binding growth factor receptor binding interleukin-2 receptor binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains response to stimulus regulation of leukocyte activation regulation of cell activation B cell activation involved in immune response positive regulation of macromolecule biosynthetic process regulation of primary metabolic process multicellular organism development positive regulation of immune response regulation of immune system process positive regulation of macromolecule metabolic process system development positive regulation of DNA recombination positive regulation of immunoglobulin mediated immune response adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains response to stimulus regulation of leukocyte activation regulation of cell activation B cell activation involved in immune response positive regulation of macromolecule biosynthetic process regulation of primary metabolic process multicellular organism development positive regulation of immune response regulation of immune system process positive regulation of macromolecule metabolic process system development positive regulation of DNA recombination positive regulation of immunoglobulin mediated immune response immune response DNA recombination primary metabolic process DNA metabolic process immune effector process regulation of gene expression biosynthetic process positive regulation of DNA metabolic process regulation of response to stimulus B cell mediated immunity positive regulation of production of molecular mediator of immune response regulation of macromolecule biosynthetic process metabolic process regulation of DNA metabolic process immunoglobulin production regulation of developmental process positive regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains somatic cell DNA recombination somatic diversification of immunoglobulins involved in immune response positive regulation of lymphocyte activation somatic recombination of immunoglobulin gene segments positive regulation of biosynthetic process regulation of immunoglobulin mediated immune response regulation of B cell activation leukocyte activation involved in immune response positive regulation of isotype switching positive regulation of immune effector process positive regulation of cellular process production of molecular mediator of immune response positive regulation of immunoglobulin production regulation of isotype switching cell activation regulation of macromolecule metabolic process macromolecule biosynthetic process nucleic acid metabolic process positive regulation of gene expression immune system process somatic diversification of immune receptors via germline recombination within a single locus cellular process regulation of lymphocyte activation lymphocyte mediated immunity regulation of immune effector process multicellular organismal process regulation of DNA recombination positive regulation of leukocyte mediated immunity regulation of cellular process cell activation involved in immune response nucleobase-containing compound metabolic process positive regulation of developmental process positive regulation of cell activation positive regulation of metabolic process anatomical structure development positive regulation of leukocyte activation leukocyte mediated immunity somatic diversification of immune receptors regulation of nucleobase-containing compound metabolic process positive regulation of adaptive immune response positive regulation of immune system process somatic recombination of immunoglobulin genes involved in immune response developmental process regulation of biological process regulation of adaptive immune response regulation of B cell mediated immunity somatic diversification of immunoglobulins regulation of leukocyte mediated immunity regulation of immune response positive regulation of multicellular organismal process regulation of production of molecular mediator of immune response macromolecule metabolic process regulation of metabolic process isotype switching immune system development immunoglobulin production involved in immunoglobulin-mediated immune response positive regulation of lymphocyte mediated immunity positive regulation of biological process lymphocyte activation positive regulation of B cell mediated immunity leukocyte activation positive regulation of response to stimulus regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of isotype switching to IgG isotypes regulation of multicellular organismal process lymphocyte activation involved in immune response regulation of biosynthetic process B cell activation biological regulation gene expression adaptive immune response immunoglobulin mediated immune response positive regulation of B cell activation regulation of isotype switching to IgG isotypes regulation of lymphocyte mediated immunity regulation of immunoglobulin production isotype switching to IgG isotypes positive regulation of cytosolic calcium ion concentration regulation of biological quality cellular response to stimulus interleukin-2-mediated signaling pathway cell surface receptor signaling pathway cellular response to interleukin-2 signaling response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to interleukin-2 response to chemical cellular response to cytokine stimulus signal transduction cell surface receptor signaling pathway via STAT regulation of leukocyte differentiation mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation positive regulation of T cell differentiation regulation of cell development T cell activation cell differentiation T cell differentiation positive regulation of T cell activation positive regulation of cell development positive regulation of regulatory T cell differentiation regulation of leukocyte cell-cell adhesion leukocyte differentiation cellular developmental process cell development positive regulation of leukocyte cell-cell adhesion leukocyte cell-cell adhesion positive regulation of cell-cell adhesion regulation of T cell differentiation cell adhesion cell-cell adhesion positive regulation of hemopoiesis positive regulation of cell differentiation regulation of cell-cell adhesion regulation of lymphocyte differentiation regulation of multicellular organismal development hemopoiesis positive regulation of cell adhesion regulation of cell adhesion regulation of regulatory T cell differentiation regulation of T cell activation regulatory T cell differentiation regulation of hemopoiesis positive regulation of leukocyte differentiation positive regulation of lymphocyte differentiation regulation of defense response regulation of response to external stimulus negative regulation of inflammatory response defense response negative regulation of response to stimulus negative regulation of biological process response to external stimulus regulation of inflammatory response response to stress negative regulation of response to external stimulus regulation of response to stress negative regulation of defense response inflammatory response mature B cell differentiation positive regulation of B cell differentiation regulation of plasma cell differentiation positive regulation of plasma cell differentiation plasma cell differentiation regulation of B cell differentiation B cell differentiation mature B cell differentiation involved in immune response cell projection organization positive regulation of dendritic spine development regulation of dendritic spine development neuron projection development cellular component organization neurogenesis neuron differentiation dendrite development cellular component organization or biogenesis dendritic spine development plasma membrane bounded cell projection organization nervous system development generation of neurons neuron development response to alcohol response to oxygen-containing compound response to ethanol negative regulation of lymphocyte proliferation negative regulation of lymphocyte activation leukocyte proliferation negative regulation of mononuclear cell proliferation negative regulation of leukocyte proliferation lymphocyte proliferation negative regulation of cellular process regulation of lymphocyte proliferation regulation of leukocyte proliferation negative regulation of cell population proliferation cell population proliferation negative regulation of cell activation negative regulation of immune system process regulation of cell population proliferation mononuclear cell proliferation regulation of mononuclear cell proliferation negative regulation of multicellular organismal process negative regulation of leukocyte activation signal transduction in absence of ligand cell death extrinsic apoptotic signaling pathway apoptotic signaling pathway extrinsic apoptotic signaling pathway in absence of ligand apoptotic process programmed cell death positive regulation of cell population proliferation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation positive regulation of activated T cell proliferation positive regulation of leukocyte proliferation regulation of activated T cell proliferation activated T cell proliferation positive regulation of mononuclear cell proliferation T cell proliferation regulation of T cell proliferation phospholipase C-activating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway homeostatic process T cell homeostatic proliferation T cell homeostasis multicellular organismal-level homeostasis regulation of T cell homeostatic proliferation leukocyte homeostasis homeostasis of number of cells lymphocyte homeostasis cytokine production regulation of cytokine production interleukin-17 production regulation of interleukin-17 production positive regulation of interleukin-17 production positive regulation of cytokine production positive regulation of B cell proliferation regulation of B cell proliferation B cell proliferation positive regulation of DNA-templated transcription RNA metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II regulation of RNA biosynthetic process regulation of transcription by RNA polymerase II positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process regulation of DNA-templated transcription regulation of alpha-beta T cell activation negative regulation of cell adhesion negative regulation of T cell differentiation regulation of T-helper cell differentiation alpha-beta T cell activation T-helper cell differentiation negative regulation of leukocyte differentiation negative regulation of immune effector process negative regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains negative regulation of T cell activation negative regulation of leukocyte cell-cell adhesion negative regulation of cell-cell adhesion T-helper 17 cell differentiation negative regulation of T-helper 17 cell differentiation CD4-positive, alpha-beta T cell differentiation alpha-beta T cell differentiation T cell activation involved in immune response negative regulation of cell differentiation regulation of T-helper 17 cell differentiation negative regulation of developmental process negative regulation of T-helper 17 type immune response negative regulation of cell development regulation of CD4-positive, alpha-beta T cell activation negative regulation of alpha-beta T cell activation negative regulation of hemopoiesis negative regulation of immune response negative regulation of adaptive immune response negative regulation of CD4-positive, alpha-beta T cell activation negative regulation of lymphocyte differentiation negative regulation of CD4-positive, alpha-beta T cell differentiation regulation of CD4-positive, alpha-beta T cell differentiation regulation of alpha-beta T cell differentiation negative regulation of alpha-beta T cell differentiation alpha-beta T cell activation involved in immune response CD4-positive, alpha-beta T cell activation regulation of T-helper 17 type immune response T cell differentiation involved in immune response negative regulation of T-helper cell differentiation T-helper 17 type immune response regulation of type II interferon production type II interferon production positive regulation of type II interferon production regulation of leukocyte apoptotic process regulation of lymphocyte apoptotic process regulation of B cell apoptotic process negative regulation of programmed cell death leukocyte apoptotic process regulation of apoptotic process B cell apoptotic process regulation of programmed cell death negative regulation of B cell apoptotic process lymphocyte apoptotic process negative regulation of apoptotic process negative regulation of leukocyte apoptotic process negative regulation of lymphocyte apoptotic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR030477	Interleukin-2, conserved site	Conserved Site
C	IPR000779	Interleukin-2	Family
C	IPR009079	Four-helical cytokine-like, core	Homologous Superfamily

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.