4iso Citations

Crystal structures of matriptase in complex with its inhibitor hepatocyte growth factor activator inhibitor-1.

J Biol Chem 288 11155-64 (2013)
Related entries: 4is5, 4isl, 4isn

Cited: 19 times
EuropePMC logo PMID: 23443661

Abstract

Matriptase, a type II trans-membrane serine protease of the S1 trypsin-like family, is expressed on the surface of nearly all normal human epithelium and found in biological fluid-like human milk. Matriptase overexpression has been implicated in tumor progression in certain epithelium-derived cancer cells. Matriptase is tightly regulated by its cognate inhibitor hepatocyte growth factor activator inhibitor-1 (HAI-1). It has been demonstrated that the Kunitz domain I (KD1) but not Kunitz domain II (KD2) of HAI-1 is responsible for the inhibitory activity of HAI-1 against matriptase. To investigate the molecular basis of inhibition of matriptase by HAI-1, we solved several crystal structures of matriptase serine protease domain in complex with the fragments of HAI-1. Based on these structures, we found that the binding of KD1 was different from previously predicted binding mode. The P3 arginine residue occupies the S3 specificity pocket of matriptase, but not the S4 pocket as in the cases of hepatocyte growth factor activator·HAI-1 KD1 and matriptase·sunflower trypsin inhibitor-1 complexes. The long 60-loop of matriptase makes direct contact with HAI-1 but remains flexible even in the complexes, and its apex does not bind with KD1 tightly. The interactions between this unique 60-loop and KD1 may provide an opportunity to increase the specificity and inhibitory activity of KD1 for matriptase. Furthermore, comparison between KD1 and a homology model of HAI-1 KD2 rationalizes the structural basis of why KD1 but not KD2 is responsible for the inhibitory activity of HAI-1 against matriptase.

Articles - 4iso mentioned but not cited (3)

  1. Functional analysis of a missense mutation in the serine protease inhibitor SPINT2 associated with congenital sodium diarrhea. Faller N, Gautschi I, Schild L. PLoS One 9 e94267 (2014)
  2. Crystal structures of matriptase in complex with its inhibitor hepatocyte growth factor activator inhibitor-1. Zhao B, Yuan C, Li R, Qu D, Huang M, Ngo JC. J Biol Chem 288 11155-11164 (2013)
  3. The Kunitz Domain I of Hepatocyte Growth Factor Activator Inhibitor-2 Inhibits Matriptase Activity and Invasive Ability of Human Prostate Cancer Cells. Wu SR, Teng CH, Tu YT, Ko CJ, Cheng TS, Lan SW, Lin HY, Lin HH, Tu HF, Hsiao PW, Huang HP, Chen CH, Lee MS. Sci Rep 7 15101 (2017)


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