7U5B | pdb_00007u5b

Structure of Human KLK5 bound to anti-KLK5 Fab

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody 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)
C [auth H]	MATH_2	e7u5bH1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)
A	MATH_2	e7u5bA1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)
E [auth L]	MATH_2	e7u5bL1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)
B	MATH_2	e7u5bB1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)
F [auth I]	MATH_2	e7u5bI1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)
D [auth J]	MATH_2	e7u5bJ1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: MATH_2	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F [auth I]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (utative)
D [auth J]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A, C [auth H]	Heavy Chain	IGHV3	-	kallikrein-5	SAbDab (2026-03-27)
B, E [auth L]	Light Chain	IGKV1	Kappa	kallikrein-5	SAbDab (2026-03-27)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C [auth H]	anti-KLK5 Fab Heavy Chain	-	-	-
B, E [auth L]	anti-KLK5 Fab Light Chain	-	-	-
D [auth J], F [auth I]	Kallikrein-5	peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity endopeptidase activity	cellular response to stimulus positive regulation of cell communication regulation of biological process regulation of signaling regulation of cellular process positive regulation of signal transduction response to stimulus signaling biological regulation positive regulation of biological process regulation of signal transduction positive regulation of G protein-coupled receptor signaling pathway cell communication positive regulation of response to stimulus regulation of response to stimulus cellular response to stimulus positive regulation of cell communication regulation of biological process regulation of signaling regulation of cellular process positive regulation of signal transduction response to stimulus signaling biological regulation positive regulation of biological process regulation of signal transduction positive regulation of G protein-coupled receptor signaling pathway cell communication positive regulation of response to stimulus regulation of response to stimulus regulation of cell communication G protein-coupled receptor signaling pathway cellular process signal transduction regulation of G protein-coupled receptor signaling pathway positive regulation of cellular process positive regulation of signaling developmental process anatomical structure morphogenesis odontogenesis of dentin-containing tooth anatomical structure formation involved in morphogenesis anatomical structure development odontogenesis animal organ development amelogenesis animal organ morphogenesis multicellular organismal process epithelium development keratinization epidermal cell differentiation cellular developmental process epidermis development tissue development cell death epithelial cell differentiation skin development cell differentiation keratinocyte differentiation programmed cell death cornification biosynthetic process metabolic process primary metabolic process protein metabolic process macromolecule metabolic process gene expression macromolecule biosynthetic process protein maturation cellular component organization cellular component disassembly extracellular matrix disassembly extracellular matrix organization cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization proteolysis antibacterial peptide production humoral immune response biological process involved in interspecies interaction between organisms antimicrobial humoral response response to biotic stimulus defense response to bacterium antimicrobial humoral immune response mediated by antimicrobial peptide antimicrobial peptide production response to stress response to bacterium response to external biotic stimulus production of molecular mediator of immune response response to other organism defense response immune response defense response to symbiont response to external stimulus antibacterial humoral response peptide biosynthetic process antibacterial peptide biosynthetic process immune system process defense response to other organism antimicrobial peptide biosynthetic process peptide metabolic process	cellular anatomical structure extracellular region intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle intracellular vesicle intracellular membrane-bounded organelle epidermal lamellar body endomembrane system intracellular organelle lamellar body cytoplasmic vesicle organelle cellular anatomical structure extracellular region intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle intracellular vesicle intracellular membrane-bounded organelle epidermal lamellar body endomembrane system intracellular organelle lamellar body cytoplasmic vesicle organelle secretory granule secretory vesicle vesicle extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D [auth J], F [auth I]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
D [auth J], F [auth I]	IPR001314	Peptidase S1A, chymotrypsin family	Family
D [auth J], F [auth I]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
D [auth J], F [auth I]	IPR001254	Serine proteases, trypsin domain	Domain
D [auth J], F [auth I]	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
D [auth J], F [auth I]	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth J], F [auth I]	Pharos: Q9Y337	prostate cancer astrocytic tumor breast carcinoma invasive ductal breast carcinoma oligodendroglioma Prostatic Neoplasms atopic eczema diabetes mellitus malignant ependymoma rosacea breast cancer esophageal adenocarcinoma Netherton syndrome prostate carcinoma

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.