6FXN | pdb_00006fxn

Crystal structure of human BAFF in complex with Fab fragment of anti-BAFF antibody belimumab

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
E	d6fxne2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E	d6fxne1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
G	d6fxng2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
G	d6fxng1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
I	d6fxni2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
I	d6fxni1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
N	d6fxnn2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
N	d6fxnn1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
P	d6fxnp2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
P	d6fxnp1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
R	d6fxnr2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
R	d6fxnr1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d6fxnd1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d6fxnd2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F	d6fxnf1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F	d6fxnf2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
M	d6fxnm1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
M	d6fxnm2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
Q	d6fxnq1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
Q	d6fxnq2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
O	d6fxno1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
O	d6fxno2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
H	d6fxnh1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
H	d6fxnh2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d6fxna_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C	d6fxnc_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
K	d6fxnk_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
L	d6fxnl_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
J	d6fxnj_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6fxnb_	All beta proteins	TNF-like	TNF-like	TNF-like	Soluble part of TALL-1, sTALL-1 (BAFF)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	TNF-like	8040716	3000061	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	TNF-like	8040716	3000061	SCOP2B (2022-06-29)
K	SCOP2B Superfamily	TNF-like	8040716	3000061	SCOP2B (2022-06-29)
L	SCOP2B Superfamily	TNF-like	8040716	3000061	SCOP2B (2022-06-29)
J	SCOP2B Superfamily	TNF-like	8040716	3000061	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	TNF-like	8040716	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)
E	UDPGP	e6fxnE1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
G	F_bP_aldolase	e6fxnG1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: F_bP_aldolase	ECOD (v294.1)
I	UDPGP	e6fxnI1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
N	UDPGP	e6fxnN1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
P	UDPGP	e6fxnP1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
R	UDPGP	e6fxnR1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
D	UDPGP	e6fxnD1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
F	F_bP_aldolase	e6fxnF1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: F_bP_aldolase	ECOD (v294.1)
M	UDPGP	e6fxnM1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
Q	UDPGP	e6fxnQ1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
O	UDPGP	e6fxnO1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
H	UDPGP	e6fxnH1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
A	F_bP_aldolase	e6fxnA1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: F_bP_aldolase	ECOD (v294.1)
C	UDPGP	e6fxnC1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
K	UDPGP	e6fxnK1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
L	UDPGP	e6fxnL1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
J	UDPGP	e6fxnJ1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)
B	UDPGP	e6fxnB1	A: a/b three-layered sandwiches	X: Periplasmic binding protein-like II	H: Rubredoxin-related	T: Tetrapyrrole methylase C-terminal domain	F: UDPGP	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
I	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
N	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
P	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
R	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
M	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
Q	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
O	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
C	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
K	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
L	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
J	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
B	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		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, G, I, N, P E, G, I, N, P, R	Fab belimumab	L-LAMBDA	Homo sapiens (human)	IGLV3-1901, IGLJ302, IGLC201, IGLC202, IGLC3*04	V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA	IG	FAB-GAMMA-1_LAMBDA	IMGT (202614-0)
D, F, H, M, O D, F, H, M, O, Q	Fab belimumab	VH-CH1	Homo sapiens (human)	IGHV1-6901, IGHV1-6912, IGHV1-6913, IGHV1-69D01, IGHJ201, IGHG101, IGHG102, IGHG104, IGHG1*05	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_LAMBDA	IMGT (202614-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E, G, I, N, P E, G, I, N, P, R	Light Chain	IGLV3	Lambda	tumor necrosis factor ligand superfamily member 13b	SAbDab (2026-04-17)
D, F, H, M, O D, F, H, M, O, Q	Heavy Chain	IGHV1	-	tumor necrosis factor ligand superfamily member 13b	SAbDab (2026-04-17)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
E, G, I, N, P E, G, I, N, P, R	Belimumab	TNFSF13B/CD257/BAFF	Therapeutic SAbDab (2026-04-17)
D, F, H, M, O D, F, H, M, O, Q	Belimumab	TNFSF13B/CD257/BAFF	Therapeutic SAbDab (2026-04-17)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, J, K A, B, C, J, K, L	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
E, G, I, N, P E, G, I, N, P, R	belimumab light chain	-	-	-
D, F, H, M, O D, F, H, M, O, Q	belimumab heavy chain	-	-	-
A, B, C, J, K A, B, C, J, K, L	Tumor necrosis factor ligand superfamily member 13B	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 cytokine receptor binding tumor necrosis factor receptor superfamily binding tumor necrosis factor receptor binding	multicellular organismal process regulation of cellular process regulation of leukocyte activation positive regulation of biological process regulation of cell activation lymphocyte activation leukocyte activation positive regulation of lymphocyte activation positive regulation of cell activation regulation of B cell activation positive regulation of leukocyte activation regulation of multicellular organismal process regulation of immune system process positive regulation of immune system process multicellular organismal process regulation of cellular process regulation of leukocyte activation positive regulation of biological process regulation of cell activation lymphocyte activation leukocyte activation positive regulation of lymphocyte activation positive regulation of cell activation regulation of B cell activation positive regulation of leukocyte activation regulation of multicellular organismal process regulation of immune system process positive regulation of immune system process positive regulation of cellular process regulation of biological process B cell costimulation B cell activation cell activation biological regulation positive regulation of B cell activation immune system process lymphocyte costimulation positive regulation of multicellular organismal process cellular process regulation of lymphocyte activation response to stimulus immune response developmental process skin development animal organ development anatomical structure development multicellular organismal-level homeostasis leukocyte homeostasis homeostatic process homeostasis of number of cells lymphocyte homeostasis B cell homeostasis adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of germinal center formation regulation of developmental process positive regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of germinal center formation positive regulation of response to stimulus positive regulation of developmental process regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of immune response germinal center formation positive regulation of adaptive immune response regulation of anatomical structure morphogenesis regulation of adaptive immune response adaptive immune response anatomical structure morphogenesis regulation of response to stimulus anatomical structure formation involved in morphogenesis regulation of immune response cellular response to stimulus signaling signal transduction cell communication cell population proliferation B cell proliferation leukocyte proliferation mononuclear cell proliferation lymphocyte proliferation T cell activation T cell proliferation cell surface receptor signaling pathway response to cytokine cytokine-mediated signaling pathway response to peptide cellular response to tumor necrosis factor response to chemical tumor necrosis factor-mediated signaling pathway cellular response to cytokine stimulus response to tumor necrosis factor positive regulation of leukocyte cell-cell adhesion leukocyte cell-cell adhesion positive regulation of cell-cell adhesion cell adhesion cell-cell adhesion regulation of cell-cell adhesion positive regulation of T cell activation positive regulation of cell adhesion regulation of cell adhesion regulation of T cell activation regulation of leukocyte cell-cell adhesion T cell costimulation positive regulation of cell population proliferation positive regulation of B cell proliferation regulation of B cell proliferation positive regulation of mononuclear cell proliferation regulation of lymphocyte proliferation regulation of leukocyte proliferation positive regulation of lymphocyte proliferation regulation of cell population proliferation positive regulation of leukocyte proliferation regulation of mononuclear cell proliferation transitional one stage B cell differentiation cellular developmental process immature B cell differentiation hemopoiesis cell development mononuclear cell differentiation lymphocyte differentiation transitional stage B cell differentiation B cell differentiation cell differentiation leukocyte differentiation positive regulation of T cell proliferation regulation of T cell proliferation	cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction membrane cell periphery plasma membrane intracellular anatomical structure cytoplasm extracellular region perinuclear region of cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, J, K A, B, C, J, K, L	IPR008983	Tumour necrosis factor-like domain superfamily	Homologous Superfamily
A, B, C, J, K A, B, C, J, K, L	IPR051748	Tumor Necrosis Factor Ligand Superfamily	Family
A, B, C, J, K A, B, C, J, K, L	IPR006052	Tumour necrosis factor domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, J, K A, B, C, J, K, L	Pharos: Q9Y275	multiple sclerosis ovarian cancer sarcoidosis systemic lupus erythematosus arthritic joint disease breast cancer cystic fibrosis glioblastoma interstitial cystitis large cell medulloblastoma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma Sjogren syndrome tuberculosis multiple sclerosis ovarian cancer sarcoidosis systemic lupus erythematosus arthritic joint disease breast cancer cystic fibrosis glioblastoma interstitial cystitis large cell medulloblastoma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma Sjogren syndrome tuberculosis astrocytic tumor chronic obstructive pulmonary disease Duchenne muscular dystrophy head and neck cancer invasive ductal breast carcinoma lung carcinoma Mood Disorders osteosarcoma pilocytic astrocytoma subependymal giant cell astrocytoma ulcerative colitis autoimmune disease Crohn disease gastric carcinoma hematologic disease juvenile dermatomyositis malignant glioma