Annotations: 7LK4

Crystal structure of BAK L100A in complex with activating antibody fragments

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
L [auth H]	I-set	e7lk4H1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
J [auth F]	I-set	e7lk4F1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
H [auth D]	WD40, eIF2A, ANAPC4_WD40	e7lk4D1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: WD40, eIF2A, ANAPC4_WD40	ECOD (v294.2)
F [auth B]	I-set	e7lk4B1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
K [auth G]	I-set	e7lk4G1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
I [auth E]	I-set	e7lk4E1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
G [auth C]	I-set	e7lk4C1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
E [auth A]	WD40, eIF2A, ANAPC4_WD40	e7lk4A1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: WD40, eIF2A, ANAPC4_WD40	ECOD (v294.2)
D [auth S]	I-set	e7lk4S1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
C [auth R]	I-set	e7lk4R1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
B [auth Q]	I-set	e7lk4Q1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: I-set	ECOD (v294.2)
A [auth P]	WD40, eIF2A, ANAPC4_WD40	e7lk4P1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: WD40, eIF2A, ANAPC4_WD40	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
L [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
J [auth F]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
H [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
K [auth G]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
I [auth E]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
G [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D [auth S]	1.10.437.10	Mainly Alpha	Orthogonal Bundle	Apoptosis Regulator Bcl-x	Blc2-like	CATH (utative)
C [auth R]	1.10.437.10	Mainly Alpha	Orthogonal Bundle	Apoptosis Regulator Bcl-x	Blc2-like	CATH (utative)
B [auth Q]	1.10.437.10	Mainly Alpha	Orthogonal Bundle	Apoptosis Regulator Bcl-x	Blc2-like	CATH (utative)
A [auth P]	1.10.437.10	Mainly Alpha	Orthogonal Bundle	Apoptosis Regulator Bcl-x	Blc2-like	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth B], H [auth D], J [auth F], L [auth H]	Heavy Chain	IGHV5	-	bcl-2 homologous antagonist/killer	SAbDab (2026-05-08)
E [auth A], G [auth C], I [auth E], K [auth G]	Light Chain	IGKV16	Kappa	bcl-2 homologous antagonist/killer	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth P], B [auth Q], C [auth R], D [auth S]	PF00452	Apoptosis regulator proteins, Bcl-2 family (Bcl-2)	Apoptosis regulator proteins, Bcl-2 family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F [auth B], H [auth D], J [auth F], L [auth H]	7D10 antibody VH fragment	-	-	-
E [auth A], G [auth C], I [auth E], K [auth G]	7D10 antibody VL fragment	-	-	-
A [auth P], B [auth Q], C [auth R], D [auth S]	Bcl-2 homologous antagonist/killer	protein binding binding heat shock protein binding BH domain binding protein domain specific binding protein-folding chaperone binding wide pore channel activity passive transmembrane transporter activity channel activity porin activity transporter activity transmembrane transporter activity protein-containing complex binding cation binding protein binding binding heat shock protein binding BH domain binding protein domain specific binding protein-folding chaperone binding wide pore channel activity passive transmembrane transporter activity channel activity porin activity transporter activity transmembrane transporter activity protein-containing complex binding cation binding ion binding metal ion binding small molecule binding identical protein binding protein heterodimerization activity protein dimerization activity transmembrane transporter binding protein homodimerization activity	response to stimulus response to chemical response to xenobiotic stimulus developmental process camera-type eye morphogenesis multicellular organismal process sensory organ development eye development post-embryonic camera-type eye development animal organ development visual system development post-embryonic camera-type eye morphogenesis eye morphogenesis multicellular organism development response to stimulus response to chemical response to xenobiotic stimulus developmental process camera-type eye morphogenesis multicellular organismal process sensory organ development eye development post-embryonic camera-type eye development animal organ development visual system development post-embryonic camera-type eye morphogenesis eye morphogenesis multicellular organism development anatomical structure morphogenesis post-embryonic eye morphogenesis sensory organ morphogenesis anatomical structure development camera-type eye development animal organ morphogenesis post-embryonic development sensory system development system development inorganic ion homeostasis intracellular calcium ion homeostasis homeostatic process calcium ion homeostasis endoplasmic reticulum calcium ion homeostasis cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis organelle fusion cellular component organization organelle organization cellular process mitochondrial fusion cellular component organization or biogenesis mitochondrion organization cellular response to stimulus positive regulation of organelle organization regulation of cellular process regulation of cellular component organization positive regulation of cellular component organization signaling apoptotic mitochondrial changes positive regulation of biological process regulation of release of cytochrome c from mitochondria cell communication positive regulation of release of cytochrome c from mitochondria signal transduction positive regulation of cellular process regulation of biological process biological regulation cell death regulation of organelle organization apoptotic signaling pathway release of cytochrome c from mitochondria regulation of mitochondrion organization apoptotic process programmed cell death protein-containing complex organization positive regulation of cellular component biogenesis regulation of cellular component biogenesis cellular component biogenesis positive regulation of protein-containing complex assembly regulation of protein-containing complex assembly cellular component assembly protein-containing complex assembly response to mycotoxin response to toxic substance positive regulation of programmed cell death regulation of apoptotic process regulation of programmed cell death positive regulation of apoptotic process biological process involved in interspecies interaction between organisms response to other organism response to external stimulus response to fungus response to external biotic stimulus response to biotic stimulus B cell homeostasis multicellular organismal-level homeostasis leukocyte homeostasis immune system process homeostasis of number of cells lymphocyte homeostasis regulation of localization negative regulation of biological process regulation of signal transduction localization negative regulation of apoptotic signaling pathway regulation of biological quality positive regulation of membrane permeability negative regulation of cellular component organization negative regulation of programmed cell death establishment of localization negative regulation of apoptotic process regulation of response to stimulus regulation of membrane permeability negative regulation of mitochondrial outer membrane permeabilization involved in apoptotic signaling pathway regulation of mitochondrial membrane permeability involved in apoptotic process regulation of apoptotic signaling pathway negative regulation of mitochondrial membrane permeability transport negative regulation of signaling mitochondrial outer membrane permeabilization involved in programmed cell death negative regulation of cell communication positive regulation of mitochondrial membrane permeability involved in apoptotic process negative regulation of cellular process positive regulation of mitochondrial membrane permeability regulation of mitochondrial membrane permeability regulation of signaling regulation of transport negative regulation of response to stimulus negative regulation of signal transduction negative regulation of organelle organization regulation of mitochondrial outer membrane permeabilization involved in apoptotic signaling pathway regulation of cell communication negative regulation of membrane permeability mitochondrial outer membrane permeabilization limb development appendage development appendage morphogenesis limb morphogenesis fibroblast apoptotic process signal transduction in absence of ligand cell surface receptor signaling pathway extrinsic apoptotic signaling pathway extrinsic apoptotic signaling pathway in absence of ligand positive regulation of IRE1-mediated unfolded protein response positive regulation of cell communication positive regulation of signal transduction regulation of cellular response to stress endoplasmic reticulum unfolded protein response regulation of response to endoplasmic reticulum stress intracellular signal transduction positive regulation of response to stimulus regulation of endoplasmic reticulum unfolded protein response positive regulation of response to endoplasmic reticulum stress cellular response to stress regulation of intracellular signal transduction response to stress regulation of response to stress positive regulation of endoplasmic reticulum unfolded protein response response to endoplasmic reticulum stress regulation of IRE1-mediated unfolded protein response cellular response to topologically incorrect protein positive regulation of intracellular signal transduction cellular response to unfolded protein response to unfolded protein response to topologically incorrect protein IRE1-mediated unfolded protein response positive regulation of signaling positive regulation of protein metabolic process regulation of protein metabolic process primary metabolic process regulation of macromolecule metabolic process regulation of primary metabolic process positive regulation of metabolic process regulation of proteolysis proteolysis positive regulation of proteolysis metabolic process positive regulation of macromolecule metabolic process protein metabolic process macromolecule metabolic process regulation of metabolic process negative regulation of release of cytochrome c from mitochondria regulation of calcium ion transport positive regulation of cation transmembrane transport positive regulation of calcium ion transport cellular localization regulation of calcium ion transport into cytosol monoatomic ion transmembrane transport regulation of monoatomic ion transmembrane transport calcium ion transport metal ion transport monoatomic cation transmembrane transport regulation of calcium ion transmembrane 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 monoatomic cation transport regulation of metal ion transport calcium ion transmembrane import into cytosol regulation of monoatomic ion transport positive regulation of cytosolic calcium ion concentration transmembrane transport positive regulation of calcium ion transport into cytosol regulation of transmembrane transport positive regulation of transport regulation of cellular localization regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport calcium ion transport into cytosol cellular developmental process hemopoiesis B cell activation cell activation cell development B cell negative selection mononuclear cell differentiation lymphocyte differentiation lymphocyte activation leukocyte activation B cell differentiation cell differentiation B cell selection leukocyte differentiation lymphocyte apoptotic process thymocyte apoptotic process leukocyte apoptotic process T cell apoptotic process response to hydrogen peroxide response to oxidative stress response to oxygen-containing compound response to reactive oxygen species establishment or maintenance of transmembrane electrochemical gradient genitalia development reproductive system development reproductive process female genitalia development sex differentiation female sex differentiation developmental process involved in reproduction vagina development reproductive structure development intrinsic apoptotic signaling pathway regulation of mitochondrial membrane potential regulation of membrane potential B cell apoptotic process negative regulation of endoplasmic reticulum calcium ion concentration response to alcohol response to ethanol pancreas development endocrine system development endocrine pancreas development myeloid cell homeostasis DNA damage response intrinsic apoptotic signaling pathway in response to DNA damage blood vessel remodeling tissue remodeling cell population proliferation epithelial cell proliferation response to mechanical stimulus response to abiotic stimulus cellular response to mechanical stimulus cellular response to abiotic stimulus cellular response to external stimulus cellular response to environmental stimulus response to light stimulus cellular response to radiation response to UV cellular response to light stimulus response to radiation cellular response to UV negative regulation of cell population proliferation regulation of cell population proliferation intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress response to ionizing radiation response to gamma radiation apoptotic process involved in morphogenesis blood vessel morphogenesis tube development vasculature development circulatory system development apoptotic process involved in development tube morphogenesis apoptotic process involved in blood vessel morphogenesis blood vessel development animal organ regeneration regeneration cell cycle regulation of cell cycle regulation of biosynthetic process negative regulation of metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process negative regulation of macromolecule metabolic process positive regulation of mitochondrial outer membrane permeabilization involved in apoptotic signaling pathway response to UV-C	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle mitochondrial membrane mitochondrion membrane organelle outer membrane intracellular membrane-bounded organelle intracellular organelle organelle envelope bounding membrane of organelle organelle cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle mitochondrial membrane mitochondrion membrane organelle outer membrane intracellular membrane-bounded organelle intracellular organelle organelle envelope bounding membrane of organelle organelle mitochondrial envelope mitochondrial outer membrane outer membrane organelle membrane protein-containing complex BAK complex Bcl-2 family protein complex pore complex membrane protein complex endoplasmic reticulum endomembrane system

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR036834	Bcl-2-like superfamily	Homologous Superfamily
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR002475	Bcl2-like	Family
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR020728	Apoptosis regulator, Bcl-2, BH3 motif, conserved site	Conserved Site
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR020726	Apoptosis regulator, Bcl-2, BH2 motif, conserved site	Conserved Site
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR046371	Bcl-2, Bcl-2 homology region 1-3	Domain
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR026298	Bcl-2 family	Family
A [auth P], B [auth Q], C [auth R], D [auth S]	IPR020717	Apoptosis regulator, Bcl-2, BH1 motif, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth P], B [auth Q], C [auth R], D [auth S]	: Q16611	B-cell chronic lymphocytic leukemia Nerve Degeneration testicular germ cell tumor malignant colon neoplasm acute myeloid leukemia peripheral neuropathy attention deficit hyperactivity disorder, inattentive type benign colon neoplasm Graves disease ovarian cancer psoriasis autism spectrum disorder colonic neoplasm peripheral nervous system disease testicular cancer

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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.