KLK2

KLK2

Target · Serine protease

KLK2 Kallikrein related peptidase 2 · Kallikrein-2

KLK2 (kallikrein related peptidase 2, formerly kallikrein 2, prostatic) is a glandular kallikrein and trypsin-like serine protease that cleaves selectively at arginine residues. It is primarily expressed in prostatic tissue and activates pro-prostate-specific antigen. Browse Assay Genie's current range of KLK2 research reagents below, or read on for the biology behind the target.

Prostatic tissue expressionTrypsin-like serine proteaseActivates pro-PSA
261 aa
Protein length
~29 kDa
Molecular weight
19q13.33
Gene locus
EC 3.4.21.35
Enzyme class
Target information

What is KLK2 (kallikrein related peptidase 2)?

KLK2 is a highly active, trypsin-like serine protease that selectively cleaves at arginine residues. As a glandular kallikrein, it cleaves Met-Lys and Arg-Ser bonds in kininogen to release Lys-bradykinin. It is also responsible for cleaving pro-prostate-specific antigen into its enzymatically active form, which links it directly to the biology of the prostate.

The KLK2 gene encodes a member of the glandular kallikrein protein family. Kallikreins are a subgroup of serine proteases clustered on chromosome 19, and members of the family are involved in a diverse array of biological functions. The protein belongs to the peptidase S1 family, kallikrein subfamily, and is classed by HGNC in the Kallikreins gene group. The protein is primarily expressed in prostatic tissue. Alternate splicing of the gene produces both coding and non-coding transcript variants. A rat ortholog, Klk2, is recorded in the data.

The gene is highly expressed in prostate tumour cells and may be a prognostic marker for prostate cancer risk, which is why KLK2 is often studied alongside prostate-specific antigen. Its previous HGNC name was kallikrein 2, prostatic. Researchers studying KLK2 commonly compare it with other kallikrein-related peptidases, such as KLK1 and KLK4, and with plasma kallikrein (KLKB1).

Prostate cancer research

KLK2 is highly expressed in prostate tumour cells and may serve as a prognostic marker for prostate cancer risk.

PSA activation studies

KLK2 cleaves pro-prostate-specific antigen into its active form, making it relevant to prostatic protease cascades.

Serine protease biology

KLK2 is a trypsin-like serine protease that selectively cleaves at arginine residues, useful for studying substrate specificity.

Kallikrein-kinin signalling

Glandular kallikreins cleave kininogen to release Lys-bradykinin, connecting KLK2 to kinin generation.

Background

KLK2 frequently asked questions

What does KLK2 do?

KLK2 is a trypsin-like serine protease that cleaves selectively at arginine residues. It converts pro-prostate-specific antigen into its active form and, like other glandular kallikreins, cleaves kininogen at Met-Lys and Arg-Ser bonds to release Lys-bradykinin.

What other names does KLK2 go by?

The HGNC name is kallikrein related peptidase 2, and the previous name was kallikrein 2, prostatic. UniProt lists the protein as Kallikrein-2 (EC 3.4.21.35). Alternate splicing of the KLK2 gene yields both coding and non-coding transcript variants.

Is KLK2 linked to disease or conserved in other species?

KLK2 is highly expressed in prostate tumour cells and may be a prognostic marker for prostate cancer risk. A rat ortholog, Klk2, is recorded; no mouse ortholog is listed in the data, so check the datasheet of any product for its validated reactivity.

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Related targets

Other kallikrein-related peptidases and plasma kallikrein, plus related serine protease targets with products at Assay Genie.

Gene and protein annotations from HGNC, NCBI Gene and UniProt P20151; product specifications from Assay Genie datasheets.

KLK2 Product listing