Free for academic non-profit institutions. Other users need a Commercial license

Aliases for KLKB1 Gene

Aliases for KLKB1 Gene

  • Kallikrein B1 2 3 5
  • Kallikrein B, Plasma (Fletcher Factor) 1 2 3
  • Plasma Prekallikrein 3 4
  • Fletcher Factor 2 4
  • Kininogenin 3 4
  • KLK3 3 4
  • PKK 3 4
  • EC 4
  • EC 3.4.21 63
  • PKKD 3
  • PPK 3

External Ids for KLKB1 Gene

Previous HGNC Symbols for KLKB1 Gene

  • KLK3

Previous GeneCards Identifiers for KLKB1 Gene

  • GC04P188183
  • GC04P187828
  • GC04P187733
  • GC04P187844
  • GC04P187523
  • GC04P187385
  • GC04P187147
  • GC04P182900
  • GC04P187130

Summaries for KLKB1 Gene

Entrez Gene Summary for KLKB1 Gene

  • This gene encodes a glycoprotein that participates in the surface-dependent activation of blood coagulation, fibrinolysis, kinin generation and inflammation. The encoded preproprotein present in plasma as a non-covalent complex with high molecular weight kininogen undergoes proteolytic processing mediated by activated coagulation factor XII to generate a disulfide-linked, heterodimeric serine protease comprised of heavy and light chains. Certain mutations in this gene cause prekallikrein deficiency. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2016]

GeneCards Summary for KLKB1 Gene

KLKB1 (Kallikrein B1) is a Protein Coding gene. Diseases associated with KLKB1 include Fletcher Factor Deficiency and Malignant Essential Hypertension. Among its related pathways are Formation of Fibrin Clot (Clotting Cascade) and Platelet activation, signaling and aggregation. GO annotations related to this gene include serine-type endopeptidase activity and heme binding. An important paralog of this gene is TMPRSS11A.

UniProtKB/Swiss-Prot for KLKB1 Gene

  • The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin.

Gene Wiki entry for KLKB1 Gene

No data available for Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for KLKB1 Gene

Genomics for KLKB1 Gene

Regulatory Elements for KLKB1 Gene

Enhancers for KLKB1 Gene
GeneHancer Identifier Score Enhancer Sources TSS distance (kb) Number of Genes Away Size (kb) Transcription Factor Binding Sites within enhancer Other Gene Targets for Enhancer

Enhancers around KLKB1 on UCSC Golden Path with GeneCards custom track

Genomic Location for KLKB1 Gene

186,208,979 bp from pter
186,258,474 bp from pter
49,496 bases
Plus strand

Genomic View for KLKB1 Gene

Genes around KLKB1 on UCSC Golden Path with GeneCards custom track

Cytogenetic band:
KLKB1 Gene in genomic location: bands according to Ensembl, locations according to GeneLoc (and/or Entrez Gene and/or Ensembl if different)
Genomic Location for KLKB1 Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for KLKB1 Gene

Proteins for KLKB1 Gene

  • Protein details for KLKB1 Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Plasma kallikrein
    Protein Accession:
    Secondary Accessions:
    • A6NH96
    • B2R8H9
    • Q17RE8
    • Q17RE9
    • Q4W5C3

    Protein attributes for KLKB1 Gene

    638 amino acids
    Molecular mass:
    71370 Da
    Quaternary structure:
    • Forms a heterodimer with SERPINA5. The zymogen is activated by factor XIIa, which cleaves the molecule into a light chain, which contains the active site, and a heavy chain, which associates with HMW kininogen. These chains are linked by one or more disulfide bonds.

    Three dimensional structures from OCA and Proteopedia for KLKB1 Gene

neXtProt entry for KLKB1 Gene

Proteomics data for KLKB1 Gene at MOPED

Post-translational modifications for KLKB1 Gene

  • Glycosylation at Asn 127, Asn 308, Asn 396, Asn 453, and Asn 494
  • Modification sites at PhosphoSitePlus

Other Protein References for KLKB1 Gene

Antibody Products

  • R&D Systems Antibodies for KLKB1 (Plasma Kallikrein/KLKB1)

Domains & Families for KLKB1 Gene

Gene Families for KLKB1 Gene

Suggested Antigen Peptide Sequences for KLKB1 Gene

GenScript: Design optimal peptide antigens:

Graphical View of Domain Structure for InterPro Entry



  • Contains 4 apple domains.
  • Belongs to the peptidase S1 family. Plasma kallikrein subfamily.
  • Contains 4 apple domains.
  • Contains 1 peptidase S1 domain.
  • Belongs to the peptidase S1 family. Plasma kallikrein subfamily.
genes like me logo Genes that share domains with KLKB1: view

Function for KLKB1 Gene

Molecular function for KLKB1 Gene

GENATLAS Biochemistry:
kallikrein B,85kDa,plasma (Fletcher factor),cleaving bonds in kininogen to produce bradykinin,activating coagulation factors F12 and F7,contact activation pathway
UniProtKB/Swiss-Prot CatalyticActivity:
Cleaves selectively Arg- -Xaa and Lys- -Xaa bonds, including Lys- -Arg and Arg- -Ser bonds in (human) kininogen to release bradykinin.
UniProtKB/Swiss-Prot EnzymeRegulation:
Inhibited by SERPINA5.
UniProtKB/Swiss-Prot Function:
The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin.

Enzyme Numbers (IUBMB) for KLKB1 Gene

Gene Ontology (GO) - Molecular Function for KLKB1 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005506 iron ion binding IEA --
GO:0005515 protein binding IEA,IPI 2844223
genes like me logo Genes that share ontologies with KLKB1: view
genes like me logo Genes that share phenotypes with KLKB1: view

Human Phenotype Ontology for KLKB1 Gene

HPO Id HPO Name Alternative Ids Definition Synonyms

Animal Models for KLKB1 Gene

MGI Knock Outs for KLKB1:

Animal Model Products

  • Taconic Biosciences Mouse Models for KLKB1

miRNA for KLKB1 Gene

miRTarBase miRNAs that target KLKB1

No data available for Transcription Factor Targets and HOMER Transcription for KLKB1 Gene

Localization for KLKB1 Gene

Subcellular locations from UniProtKB/Swiss-Prot for KLKB1 Gene


Subcellular locations from

Jensen Localization Image for KLKB1 Gene COMPARTMENTS Subcellular localization image for KLKB1 gene
Compartment Confidence
extracellular 5
plasma membrane 5
cytosol 2
endoplasmic reticulum 1
lysosome 1
vacuole 1

Gene Ontology (GO) - Cellular Components for KLKB1 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005576 extracellular region IEA,TAS --
genes like me logo Genes that share ontologies with KLKB1: view

Pathways & Interactions for KLKB1 Gene

genes like me logo Genes that share pathways with KLKB1: view

Pathways by source for KLKB1 Gene

Gene Ontology (GO) - Biological Process for KLKB1 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0002542 Factor XII activation TAS 2510163
GO:0006508 proteolysis IEA,TAS 1993180
GO:0007597 blood coagulation, intrinsic pathway TAS --
GO:0022617 extracellular matrix disassembly TAS --
GO:0030198 extracellular matrix organization TAS --
genes like me logo Genes that share ontologies with KLKB1: view

No data available for SIGNOR curated interactions for KLKB1 Gene

Drugs & Compounds for KLKB1 Gene

(10) Drugs for KLKB1 Gene - From: DrugBank, DGIdb, HMDB, and Novoseek

Name Status Disease Links Group Role Mechanism of Action Clinical Trials
DX-88 Investigational Pharma Target 0
BCX4161 Pharma 0
Bradykinin Pharma Full agonist, Agonist Endogenous agonist at bradykinin receptors (B2 > B1) 50

(6) Additional Compounds for KLKB1 Gene - From: Novoseek

Name Synonyms Role CAS Number PubChem IDs PubMed IDs
genes like me logo Genes that share compounds with KLKB1: view

Transcripts for KLKB1 Gene

Unigene Clusters for KLKB1 Gene

Kallikrein B, plasma (Fletcher factor) 1:
Representative Sequences:

Alternative Splicing Database (ASD) splice patterns (SP) for KLKB1 Gene

No ASD Table

Relevant External Links for KLKB1 Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for KLKB1 Gene

mRNA expression in normal human tissues for KLKB1 Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for KLKB1 Gene

This gene is overexpressed in Liver (x26.2).

Protein differential expression in normal tissues from HIPED for KLKB1 Gene

This gene is overexpressed in Plasma (21.4), Serum (18.2), and Synovial fluid (17.5).

Integrated Proteomics: protein expression in normal tissues and cell lines from ProteomicsDB, PaxDb, and MOPED for KLKB1 Gene

SOURCE GeneReport for Unigene cluster for KLKB1 Gene Hs.237642

genes like me logo Genes that share expression patterns with KLKB1: view

Protein tissue co-expression partners for KLKB1 Gene

Primer Products

No data available for mRNA Expression by UniProt/SwissProt for KLKB1 Gene

Orthologs for KLKB1 Gene

This gene was present in the common ancestor of animals.

Orthologs for KLKB1 Gene

Organism Taxonomy Gene Similarity Type Details
(Bos Taurus)
Mammalia KLKB1 35
  • 83.44 (n)
  • 79.05 (a)
KLKB1 36
  • 78 (a)
(Canis familiaris)
Mammalia KLKB1 35
  • 85.49 (n)
  • 80.91 (a)
KLKB1 36
  • 81 (a)
(Mus musculus)
Mammalia Klkb1 35
  • 79.94 (n)
  • 76.18 (a)
Klkb1 16
Klkb1 36
  • 76 (a)
(Rattus norvegicus)
Mammalia Klkb1 35
  • 79.26 (n)
  • 74.76 (a)
(Monodelphis domestica)
Mammalia KLKB1 36
  • 63 (a)
(Gallus gallus)
Aves -- 36
  • 57 (a)
(Anolis carolinensis)
Reptilia -- 36
  • 54 (a)
fruit fly
(Drosophila melanogaster)
Insecta CG10472 37
  • 34 (a)
CG10663 37
  • 35 (a)
CG11192 37
  • 39 (a)
CG11824 37
  • 35 (a)
CG1299 37
  • 34 (a)
CG13744 37
  • 33 (a)
CG18065 37
  • 36 (a)
CG18735 37
  • 37 (a)
CG30371 37
  • 31 (a)
CG30375 37
  • 31 (a)
CG3355 37
  • 40 (a)
CG4386 37
  • 38 (a)
CG4613 37
  • 36 (a)
CG4914 37
  • 38 (a)
CG4998 37
  • 35 (a)
CG5246 37
  • 36 (a)
CG5390 37
  • 34 (a)
CG6048 37
  • 38 (a)
CG6865 37
  • 33 (a)
CG7542 37
  • 32 (a)
CG8213 37
  • 34 (a)
CG9294 37
  • 37 (a)
CG9372 37
  • 30 (a)
eegrTry 37
  • 35 (a)
lgrTry 37
  • 37 (a)
mas 37
  • 37 (a)
ndl 37
  • 34 (a)
Sb 37
  • 39 (a)
zgrTry 37
  • 36 (a)
Species with no ortholog for KLKB1:
  • A. gosspyii yeast (Ashbya gossypii)
  • Actinobacteria (Mycobacterium tuberculosis)
  • African clawed frog (Xenopus laevis)
  • African malaria mosquito (Anopheles gambiae)
  • Alicante grape (Vitis vinifera)
  • alpha proteobacteria (Wolbachia pipientis)
  • amoeba (Dictyostelium discoideum)
  • Archea (Pyrococcus horikoshii)
  • baker's yeast (Saccharomyces cerevisiae)
  • barley (Hordeum vulgare)
  • beta proteobacteria (Neisseria meningitidis)
  • bread mold (Neurospora crassa)
  • chimpanzee (Pan troglodytes)
  • Chromalveolata (Phytophthora infestans)
  • common water flea (Daphnia pulex)
  • corn (Zea mays)
  • E. coli (Escherichia coli)
  • filamentous fungi (Aspergillus nidulans)
  • Firmicute bacteria (Streptococcus pneumoniae)
  • fission yeast (Schizosaccharomyces pombe)
  • green algae (Chlamydomonas reinhardtii)
  • honey bee (Apis mellifera)
  • K. lactis yeast (Kluyveromyces lactis)
  • loblloly pine (Pinus taeda)
  • malaria parasite (Plasmodium falciparum)
  • medicago trunc (Medicago Truncatula)
  • moss (Physcomitrella patens)
  • orangutan (Pongo pygmaeus)
  • pig (Sus scrofa)
  • platypus (Ornithorhynchus anatinus)
  • rainbow trout (Oncorhynchus mykiss)
  • rice (Oryza sativa)
  • rice blast fungus (Magnaporthe grisea)
  • schistosome parasite (Schistosoma mansoni)
  • sea anemone (Nematostella vectensis)
  • sea squirt (Ciona intestinalis)
  • sea squirt (Ciona savignyi)
  • sea urchin (Strongylocentrotus purpuratus)
  • sorghum (Sorghum bicolor)
  • soybean (Glycine max)
  • stem rust fungus (Puccinia graminis)
  • sugarcane (Saccharum officinarum)
  • thale cress (Arabidopsis thaliana)
  • tomato (Lycopersicon esculentum)
  • toxoplasmosis (Toxoplasma gondii)
  • Trichoplax (Trichoplax adhaerens)
  • tropical clawed frog (Silurana tropicalis)
  • wheat (Triticum aestivum)
  • worm (Caenorhabditis elegans)
  • zebrafish (Danio rerio)

Evolution for KLKB1 Gene

Gene Tree for KLKB1 (if available)
Gene Tree for KLKB1 (if available)

Paralogs for KLKB1 Gene

genes like me logo Genes that share paralogs with KLKB1: view

Variants for KLKB1 Gene

Sequence variations from dbSNP and Humsavar for KLKB1 Gene

SNP ID Clin Chr 04 pos Sequence Context AA Info Type
rs3733402 Prekallikrein deficiency (PKK deficiency) 186,236,880(+) CACCA(A/C/G)TAACA reference, missense, utr-variant-5-prime
rs4253373 - 186,250,250(+) TGCCA(A/C)ATGAA reference, missense, utr-variant-5-prime
VAR_013600 -
rs4253257 - 186,238,299(+) CTACC(A/G/T)CTATA reference, missense, utr-variant-5-prime
rs4253376 - 186,251,266(+) TTCCT(C/G)TACTC reference, missense

Structural Variations from Database of Genomic Variants (DGV) for KLKB1 Gene

Variant ID Type Subtype PubMed ID
nsv461864 CNV Gain 19166990
nsv830172 CNV Loss 17160897
nsv881231 CNV Loss 21882294
nsv881472 CNV Gain 21882294
esv2728931 CNV Deletion 23290073
esv2728932 CNV Deletion 23290073
esv2348562 CNV Deletion 18987734
esv2294811 CNV Deletion 18987734
esv25841 CNV Loss 19812545
esv1184118 CNV Deletion 17803354
esv2728933 CNV Deletion 23290073
esv2670775 CNV Deletion 23128226
esv2728934 CNV Deletion 23290073
dgv186n6 CNV Loss 16902084
esv991336 CNV Deletion 20482838
nsv290547 CNV Loss 16902084
esv24919 CNV Loss 19812545

Variation tolerance for KLKB1 Gene

Residual Variation Intolerance Score: 91.3% of all genes are more intolerant (likely to be disease-causing)

Relevant External Links for KLKB1 Gene

Human Gene Mutation Database (HGMD)

No data available for Polymorphic Variants from UniProtKB/Swiss-Prot for KLKB1 Gene

Disorders for KLKB1 Gene

MalaCards: The human disease database

(10) MalaCards diseases for KLKB1 Gene - From: OMIM, ClinVar, GeneTests, Orphanet, Swiss-Prot, DISEASES, Novoseek, and GeneCards

Disorder Aliases PubMed IDs
fletcher factor deficiency
  • fletcher factor deficiency
malignant essential hypertension
  • accelerated essential hypertension
hereditary angioedema
  • c1 inhibitor deficiency
c1 inhibitor deficiency
  • quincke edema
rocky mountain spotted fever
  • brazillian spotted
- elite association - COSMIC cancer census association via MalaCards
Search KLKB1 in MalaCards View complete list of genes associated with diseases


  • Prekallikrein deficiency (PKK deficiency) [MIM:612423]: This disorder is a blood coagulation defect. {ECO:0000269 PubMed:14652634, ECO:0000269 PubMed:17598838}. Note=The disease is caused by mutations affecting the gene represented in this entry.

Genatlas disease for KLKB1 Gene

Fletcher factor deficiency,without bleeding diathesis

Relevant External Links for KLKB1

Genetic Association Database (GAD)
Human Genome Epidemiology (HuGE) Navigator
Atlas of Genetics and Cytogenetics in Oncology and Haematology:
genes like me logo Genes that share disorders with KLKB1: view

Publications for KLKB1 Gene

  1. Human plasma prekallikrein, a zymogen to a serine protease that contains four tandem repeats. (PMID: 3521732) Chung D.W. … Davie E.W. (Biochemistry 1986) 2 3 4 67
  2. Identification of human plasma kallikrein gene polymorphisms and evaluation of their role in end-stage renal disease. (PMID: 9535413) Yu H. … Freedman B.I. (Hypertension 1998) 2 3 23
  3. Genetic variants associated with deep vein thrombosis: the F11 locus. (PMID: 19583818) Li Y. … Rosendaal F.R. (J. Thromb. Haemost. 2009) 3 23
  4. Common variation in KLKB1 and essential hypertension risk: tagging-SNP haplotype analysis in a case-control study. (PMID: 17318641) Lu X. … Gu D. (Hum. Genet. 2007) 3 23
  5. Cellular expression of plasma prekallikrein in human tissues. (PMID: 17696780) Fink E. … Figueroa C.D. (Biol. Chem. 2007) 3 23

Products for KLKB1 Gene

Sources for KLKB1 Gene