Part:BBa_K4165084

SPINK13 (Serine Peptidase Inhibitor Kazal type 13).

This basic part encodes Human serine protease inhibitor known as SPINK13 which is able to inhibit trypsin-like proteases, like HtrA1 (BBa_K4165004).

Usage and Biology

This part encodes for a type of inhibitor that is predicted to be able to inhibit serine peptidases. The inhibitor is present extracellularly and is predicted to be involved in the feedback inhibition of acivation of premature acrosomal reaction sperms. The inhibitor binds to trypsin proteases and since the catalytic core of HtrA1 (BBa_K4165004) is considered as a tyrpsin-like catalytic domain, so this inhibitor also is considered to inhibit the function of HtrA1 [1] - [4].

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 135
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Functional Parameters

GC% Content 60.3%

Isoelectric point (PI) 7.904

Charge at pH 7 2.835

Molecular Weight (Protein) 11.051 kDa

It has a predicted model (AlphaFold).

AlphaFold: https://alphafold.ebi.ac.uk/entry/Q1W4C9 Molprobity: Clash Score: Ramachandran Favoured: Ramachandran Outliers: Rotamers Outliers: C-beta Deviations: Q-Mean:

References

1 - Frochaux, V., Hildebrand, D., Talke, A., Linscheid, M. W., & Schlüter, H. (2014). Alpha-1-antitrypsin: a novel human high temperature requirement protease A1 (HTRA1) substrate in human placental tissue. PloS one, 9(10), e109483. 2 - Grau, S., Baldi, A., Bussani, R., Tian, X., Stefanescu, R., Przybylski, M., ... & Ehrmann, M. (2005). Implications of the serine protease HtrA1 in amyloid precursor protein processing. Proceedings of the National Academy of Sciences, 102(17), 6021-6026. 3 - Eigenbrot, C., Ultsch, M., Lipari, M. T., Moran, P., Lin, S. J., Ganesan, R., ... & Kirchhofer, D. (2012). Structural and functional analysis of HtrA1 and its subdomains. Structure, 20(6), 1040-1050. 4 - Cai, S., Zhang, P., Dong, S., Li, L., Cai, J., & Xu, M. (2018). Downregulation of SPINK13 promotes metastasis by regulating uPA in ovarian cancer cells. Cellular Physiology and Biochemistry, 45(3), 1061-1071.