Annotations: 9I5N

Single particle cryo electron microscopy of a Fab fragment bound to recombinant human CD40 ligand

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	TNF-like	8041217	3000061	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	Lipocalin	e9i5nC1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Lipocalin	ECOD (v295.2)
B [auth A]	Lipocalin	e9i5nA1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Lipocalin	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth A]	Light Chain	IGKV17	Kappa	cd40 ligand, soluble form	SAbDab (2026-08-21)
A [auth B]	Heavy Chain	IGHV2	-	cd40 ligand, soluble form	SAbDab (2026-08-21)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C	PF00229	TNF(Tumour Necrosis Factor) family (TNF)	TNF(Tumour Necrosis Factor) family		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	CD40 ligand, soluble form	protein binding binding signaling receptor binding cytokine receptor binding tumor necrosis factor receptor superfamily binding CD40 receptor binding cell adhesion molecule binding protein-containing complex binding integrin binding molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity protein binding binding signaling receptor binding cytokine receptor binding tumor necrosis factor receptor superfamily binding CD40 receptor binding cell adhesion molecule binding protein-containing complex binding integrin binding molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity tumor necrosis factor receptor binding enzyme regulator activity protein serine/threonine kinase activator activity kinase activator activity enzyme activator activity protein kinase activator activity protein kinase regulator activity kinase regulator activity	cellular response to stimulus positive regulation of cell communication regulation of cellular process positive regulation of signal transduction positive regulation of canonical NF-kappaB signal transduction response to stimulus signaling positive regulation of biological process regulation of signal transduction intracellular signal transduction cell communication positive regulation of response to stimulus regulation of intracellular signal transduction intracellular signaling cassette cellular response to stimulus positive regulation of cell communication regulation of cellular process positive regulation of signal transduction positive regulation of canonical NF-kappaB signal transduction response to stimulus signaling positive regulation of biological process regulation of signal transduction intracellular signal transduction cell communication positive regulation of response to stimulus regulation of intracellular signal transduction intracellular signaling cassette signal transduction positive regulation of cellular process regulation of biological process regulation of signaling biological regulation positive regulation of intracellular signal transduction canonical NF-kappaB signal transduction regulation of response to stimulus regulation of cell communication regulation of canonical NF-kappaB signal transduction cellular process positive regulation of signaling negative regulation of programmed cell death regulation of apoptotic process negative regulation of biological process regulation of programmed cell death cell death negative regulation of apoptotic process negative regulation of cellular process apoptotic process programmed cell death integrin-mediated signaling pathway cell surface receptor signaling pathway extrinsic apoptotic signaling pathway positive regulation of apoptotic signaling pathway positive regulation of programmed cell death positive regulation of extrinsic apoptotic signaling pathway positive regulation of apoptotic process regulation of extrinsic apoptotic signaling pathway apoptotic signaling pathway regulation of apoptotic signaling pathway multicellular organismal process regulation of interleukin-12 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 multicellular organismal process interleukin-12 production regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of interleukin-12 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 CD40 signaling pathway regulation of body fluid levels wound healing cell activation hemostasis blood coagulation response to stress coagulation regulation of biological quality response to wounding platelet activation cell population proliferation B cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process lymphocyte proliferation interleukin-10 production regulation of interleukin-10 production positive regulation of interleukin-10 production positive regulation of endothelial cell apoptotic process endothelial cell apoptotic process regulation of endothelial cell apoptotic process cell adhesion cell-cell adhesion leukocyte cell-cell adhesion regulation of leukocyte activation regulation of cell activation positive regulation of leukocyte cell-cell adhesion positive regulation of cell-cell adhesion positive regulation of lymphocyte activation positive regulation of cell activation T cell activation positive regulation of leukocyte activation regulation of immune system process regulation of cell-cell adhesion positive regulation of immune system process positive regulation of T cell activation positive regulation of cell adhesion regulation of cell adhesion regulation of T cell activation lymphocyte costimulation regulation of leukocyte cell-cell adhesion T cell costimulation regulation of lymphocyte activation defense response inflammatory response adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity B cell activation involved in immune response cell activation involved in immune response nucleobase-containing compound metabolic process multicellular organism development anatomical structure development leukocyte mediated immunity somatic diversification of immune receptors somatic recombination of immunoglobulin genes involved in immune response system development developmental process immune response DNA recombination primary metabolic process DNA metabolic process immune effector process somatic diversification of immunoglobulins B cell mediated immunity isotype switching immune system development immunoglobulin production immunoglobulin production involved in immunoglobulin-mediated immune response somatic cell DNA recombination somatic diversification of immunoglobulins involved in immune response somatic recombination of immunoglobulin gene segments leukocyte activation involved in immune response lymphocyte activation involved in immune response production of molecular mediator of immune response immunoglobulin mediated immune response adaptive immune response nucleic acid metabolic process somatic diversification of immune receptors via germline recombination within a single locus animal gross anatomical part developmental process regulation of interleukin-4 production positive regulation of interleukin-4 production interleukin-4 production positive regulation of cell population proliferation regulation of leukocyte proliferation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation regulation of cell population proliferation positive regulation of leukocyte proliferation positive regulation of mononuclear cell proliferation T cell proliferation regulation of lymphocyte proliferation regulation of T cell proliferation regulation of mononuclear cell proliferation	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane
B [auth A]	Fab20 light chain	-	-	-
A [auth B]	Fab20 heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR008983	Tumour necrosis factor-like domain superfamily	Homologous Superfamily
C	IPR006052	Tumour necrosis factor domain	Domain
C	IPR021184	Tumour necrosis factor, conserved site	Conserved Site
C	IPR003263	CD40 ligand	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C	: P29965	hyper-IgM syndrome type 1 amyotrophic lateral sclerosis autoimmune disease allergic disease Chromosome Breakage coronary artery disease pulmonary hypertension pneumonia pneumonitis hyper-IgM syndrome X-linked acrogigantism due to Xq26 microduplication cancer hematologic disease lymphatic system disease

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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.