4R0L | pdb_00004r0l

Anti-canine CD28 antibody, 1C6, bound canine CD28

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth D]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8074070	3000071	SCOP2B (2022-06-29)
B [auth C]	SCOP2 Family	V set domains-like	8074069	4007530	SCOP2 (2022-06-29)
B [auth C]	SCOP2 Superfamily	Immunoglobulin (Ig) domain-like	8074070	3000071	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F [auth B]	IL8	e4r0lB1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)
E [auth L]	IL8	e4r0lL1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)
C [auth D]	IL8	e4r0lD1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)
B [auth C]	IL8	e4r0lC1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)
D [auth H]	IL8	e4r0lH1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)
A	IL8	e4r0lA1	A: a/b three-layered sandwiches	X: Ribosomal protein S7	H: Ribosomal protein S7	T: Ribosomal protein S7	F: IL8	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	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
E [auth L], F [auth B]	1C6 Fab	V-KAPPA	Mus musculus (house mouse)	IGKV2-13701, IGKJ201	V-DOMAIN V-KAPPA	IG	FV-HEAVY_KAPPA	IMGT (202612-0)
B [auth C], C [auth D]	CD28	1V-LIKE	Canis lupus familiaris (dog)	CD28*01	V-LIKE-DOMAIN V-LIKE	RPI	1V-LIKE	IMGT (202612-0)
A, D [auth H]	1C6 Fab	VH	Mus musculus (house mouse)	IGHV9-3-101, IGHJ201	V-DOMAIN VH	IG	FV-HEAVY_KAPPA	IMGT (202612-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth L], F [auth B]	Light Chain	IGKV2	Kappa	t-cell costimulatory molecule cd28	SAbDab (2026-03-27)
A, D [auth H]	Heavy Chain	IGHV9	-	t-cell costimulatory molecule cd28	SAbDab (2026-03-27)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth L], F [auth B]	Antibody 1C6 Light chain	-	-	-
B [auth C], C [auth D]	T-cell costimulatory molecule CD28	-	multicellular organismal process regulation of cellular process positive regulation of cell population proliferation regulation of leukocyte activation regulation of cell activation positive regulation of cell activation T cell activation lymphocyte proliferation positive regulation of leukocyte activation regulation of immune system process positive regulation of immune system process regulation of leukocyte proliferation regulation of biological process cell population proliferation multicellular organismal process regulation of cellular process positive regulation of cell population proliferation regulation of leukocyte activation regulation of cell activation positive regulation of cell activation T cell activation lymphocyte proliferation positive regulation of leukocyte activation regulation of immune system process positive regulation of immune system process regulation of leukocyte proliferation regulation of biological process cell population proliferation positive regulation of T cell activation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation regulation of cell population proliferation mononuclear cell 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 lymphocyte activation leukocyte proliferation leukocyte cell-cell adhesion leukocyte activation positive regulation of cell-cell adhesion 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 T cell proliferation regulation of lymphocyte proliferation positive regulation of cell adhesion regulation of cell adhesion biological regulation cell activation regulation of T cell activation regulation of T cell proliferation immune system process regulation of mononuclear cell proliferation cellular process regulation of lymphocyte activation response to stimulus immune response positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process regulation of cytokine production cytokine production positive regulation of macromolecule metabolic process regulation of biosynthetic process regulation of interleukin-2 production interleukin-2 production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of interleukin-2 production regulation of gene expression biosynthetic process positive regulation of gene expression regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process positive regulation of organelle organization regulation of cellular component organization positive regulation of cellular component organization regulation of mitotic nuclear division positive regulation of mitotic nuclear division mitotic cell cycle cellular component organization regulation of mitotic cell cycle positive regulation of cell cycle process cellular component organization or biogenesis cell cycle regulation of cell cycle cell cycle process mitotic nuclear division regulation of cell cycle process organelle fission positive regulation of nuclear division regulation of organelle organization positive regulation of cell cycle organelle organization nuclear division mitotic cell cycle process regulation of nuclear division	cell periphery cellular anatomical structure plasma membrane membrane
A, D [auth H]	Antibody 1C6 Heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth C], C [auth D]	IPR040216	Cytotoxic T-lymphocyte protein 4/CD28	Family
B [auth C], C [auth D]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B [auth C], C [auth D]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B [auth C], C [auth D]	IPR013106	Immunoglobulin V-set domain	Domain
B [auth C], C [auth D]	IPR008093	T cell antigen CD28	Family

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.