4k1e
Atomic resolution crystal structures of Kallikrein-Related Peptidase 4 complexed with a modified SFTI inhibitor FCQR
Structural highlights
DiseaseKLK4_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] FunctionKLK4_HUMAN Involved in enamel formation.[2] Publication Abstract from PubMedThe 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[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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