Annotations: 6AL5

COMPLEX BETWEEN CD19 (N138Q MUTANT) AND B43 FAB

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Protein Modification Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth L]	d6al5l2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	Human (Homo sapiens ) [TaxId: 9606 ], Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth L]	d6al5l1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ], Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C [auth H]	d6al5h_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ], Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	V-set	e6al5A1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: V-set	ECOD (v294.1)
A	Ras	e6al5A2	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Rubredoxin-related	F: Ras	ECOD (v294.1)
B [auth L]	V-set	e6al5L1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: V-set	ECOD (v294.1)
C [auth H]	V-set	e6al5H1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: V-set	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth H]	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
B [auth L]	Fab B43	L-KAPPA	Homo sapiens (human)	IGKV1-501, IGKJ401, IGKJ202, IGKJ402, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202615-0)
C [auth H]	Fab B43	VH-CH1	Homo sapiens (human)	IGHV1-6901, IGHV1-6911, IGHV1-6912, IGHV1-6913, IGHV1-69D01, IGHV1-6915, IGHJ401, IGHJ402, IGHJ403, IGHG101, IGHG102, IGHG104, IGHG1*05	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202615-0)

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	b-lymphocyte antigen cd19	SAbDab (2026-04-24)
C [auth H]	Heavy Chain	IGHV1	-	b-lymphocyte antigen cd19	SAbDab (2026-04-24)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	B-lymphocyte antigen CD19	-	multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response developmental process cellular developmental process hemopoiesis cell development mononuclear cell differentiation mature B cell differentiation lymphocyte differentiation B-1 B cell differentiation B cell differentiation cell differentiation anatomical structure development leukocyte differentiation regulation of calcium ion transport regulation of localization positive regulation of cation transmembrane transport positive regulation of calcium ion transport transport monoatomic ion transmembrane transport regulation of monoatomic ion transmembrane transport calcium ion transport metal ion transport regulation of calcium ion transmembrane transport monoatomic cation transmembrane transport localization intercellular transport positive regulation of monoatomic ion transport positive regulation of calcium ion transmembrane transport positive regulation of transmembrane transport monoatomic ion transport positive regulation of monoatomic ion transmembrane transport positive regulation of release of sequestered calcium ion into cytosol monoatomic cation transport regulation of metal ion transport positive regulation of cellular process calcium ion transmembrane import into cytosol regulation of transport regulation of release of sequestered calcium ion into cytosol regulation of monoatomic ion transport establishment of localization transmembrane transport release of sequestered calcium ion into cytosol regulation of transmembrane transport positive regulation of transport regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport B cell proliferation involved in immune response B cell activation involved in immune response cell activation involved in immune response leukocyte activation involved in immune response lymphocyte activation involved in immune response regulation of leukocyte activation regulation of cell activation regulation of B cell activation regulation of multicellular organismal process regulation of lymphocyte activation positive regulation of cell communication regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signal transduction regulation of signal transduction intracellular signal transduction regulation of intracellular signal transduction intracellular signaling cassette regulation of signaling positive regulation of intracellular signal transduction positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction regulation of cell communication phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signaling regulation of B cell receptor signaling pathway regulation of antigen receptor-mediated signaling pathway	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle extracellular membrane-bounded organelle membrane microdomain membrane raft protein-containing complex
B [auth L]	B43 LIGHT CHAIN	-	response to stimulus immune response immune system process adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region
C [auth H]	B43 HEAVY CHAIN	-	response to stimulus immune response immune system process adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR042341	B-lymphocyte antigen CD19	Family
A	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A	IPR003599	Immunoglobulin domain subtype	Domain
A	IPR007110	Immunoglobulin-like domain	Domain
B [auth L]	IPR003597	Immunoglobulin C1-set	Domain
B [auth L]	IPR050150	Immunoglobulin Variable Light Chain	Family
B [auth L]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B [auth L]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B [auth L]	IPR013106	Immunoglobulin V-set domain	Domain
B [auth L]	IPR003599	Immunoglobulin domain subtype	Domain
B [auth L]	IPR007110	Immunoglobulin-like domain	Domain
B [auth L]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
C [auth H]	IPR003597	Immunoglobulin C1-set	Domain
C [auth H]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C [auth H]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C [auth H]	IPR013106	Immunoglobulin V-set domain	Domain
C [auth H]	IPR003599	Immunoglobulin domain subtype	Domain
C [auth H]	IPR007110	Immunoglobulin-like domain	Domain
C [auth H]	IPR050380	Immune Recognition and Response Modulators	Family
C [auth H]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: P15391	agammaglobulinemia common variable immunodeficiency immunodeficiency, common variable, 3 lymphatic system disease neuromyelitis optica Pre B-cell acute lymphoblastic leukemia tuberculosis anemia B cell deficiency bone marrow disease diffuse large B-cell lymphoma immunodeficiency, common variable, 2 interstitial cystitis osteosarcoma Sjogren syndrome agammaglobulinemia common variable immunodeficiency immunodeficiency, common variable, 3 lymphatic system disease neuromyelitis optica Pre B-cell acute lymphoblastic leukemia tuberculosis anemia B cell deficiency bone marrow disease diffuse large B-cell lymphoma immunodeficiency, common variable, 2 interstitial cystitis osteosarcoma Sjogren syndrome ulcerative colitis arthritic joint disease B-cell neoplasm cancer leukopenia nasopharyngeal carcinoma periodontitis skin disease autoimmune disease bipolar disorder

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
C [auth H]	PCA	Parent Component: GLN : AA0031 : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420