| Structural highlights
Disease
[KLK4_HUMAN] Defects in KLK4 are the cause of amelogenesis imperfecta hypomaturation type 2A1 (AI2A1) [MIM:204700]. AI2A1 is an autosomal recessive defect of enamel formation. The disorder involves both primary and secondary dentitions. The teeth have a shiny agar jelly appearance and the enamel is softer than normal. Brown pigment is present in middle layers of enamel.[1]
Function
[KLK4_HUMAN] Involved in enamel formation.[2] [SFTI1_HELAN] Inhibits trypsin, cathepsin G, elastase, chymotrypsin and thrombin. Does not inhibit factor Xa.[3]
Publication Abstract from PubMed
The kallikrein-related peptidase (KLK) family of proteases is involved in many aspects of human health and disease. One member of this family, KLK4, has been implicated in cancer development and metastasis. Understanding mechanisms of inactivation are critical to developing selective KLK4 inhibitors. We have determined the X-ray crystal structures of KLK4 in complex with both sunflower trypsin inhibitor-1 (SFTI-1) and a rationally designed SFTI-1 derivative to atomic (~1 A) resolution, as well as with bound nickel. These structures offer a structural rationalization for the potency and selectivity of these inhibitors, and together with MD simulation and computational analysis, reveal a dynamic pathway between the metal binding exosite and the active site, providing key details of a previously proposed allosteric mode of inhibition. Collectively, this work provides insight into both direct and indirect mechanisms of inhibition for KLK4 that have broad implications for the enzymology of the serine protease superfamily, and may potentially be exploited for the design of therapeutic inhibitors.
Direct and indirect mechanisms of KLK4 inhibition revealed by structure and dynamics.,Riley BT, Ilyichova O, Costa MG, Porebski BT, de Veer SJ, Swedberg JE, Kass I, Harris JM, Hoke DE, Buckle AM Sci Rep. 2016 Oct 21;6:35385. doi: 10.1038/srep35385. PMID:27767076[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Hart PS, Hart TC, Michalec MD, Ryu OH, Simmons D, Hong S, Wright JT. Mutation in kallikrein 4 causes autosomal recessive hypomaturation amelogenesis imperfecta. J Med Genet. 2004 Jul;41(7):545-9. PMID:15235027
- ↑ Hart PS, Hart TC, Michalec MD, Ryu OH, Simmons D, Hong S, Wright JT. Mutation in kallikrein 4 causes autosomal recessive hypomaturation amelogenesis imperfecta. J Med Genet. 2004 Jul;41(7):545-9. PMID:15235027
- ↑ Luckett S, Garcia RS, Barker JJ, Konarev AV, Shewry PR, Clarke AR, Brady RL. High-resolution structure of a potent, cyclic proteinase inhibitor from sunflower seeds. J Mol Biol. 1999 Jul 9;290(2):525-33. PMID:10390350 doi:10.1006/jmbi.1999.2891
- ↑ Riley BT, Ilyichova O, Costa MG, Porebski BT, de Veer SJ, Swedberg JE, Kass I, Harris JM, Hoke DE, Buckle AM. Direct and indirect mechanisms of KLK4 inhibition revealed by structure and dynamics. Sci Rep. 2016 Oct 21;6:35385. doi: 10.1038/srep35385. PMID:27767076 doi:http://dx.doi.org/10.1038/srep35385
|
