Part:BBa_K4165010
Human serine protease inhibitor Kazal type 8 (SPINK8)
This basic part encodes Human serine protease inhibitor known as SPINK8 which is able to inhibit trypsin-like proteases like serine protease HtrA1 (BBa_K4165004).
Usage and Biology
This type of family encodes inhibitors that is predicted to be able to inhibit serine peptidases. The inhibitor is present extracellularly and binds to trypsin-like proteases (serine proteases) and since the catalytic core of HtrA1 (BBa_K4165004) is considered as a trypsin-like catalytic domain, so this inhibitor also is considered to inhibit the function of HtrA1.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
Functional Parameters
| GC Content% | Isoelectric point (PI) | Charge at pH 7 | Molecular Weight (Protein) |
|---|---|---|---|
| 61.2% | 4.597 | -3.459 | 10.821 |
Dry Lab Characterization
Modeling
This inhibitor was modeled using different software (trRosetta - AlphaFold2 - RosettaFold - Modeller) and the top model was acquired from trRosetta ranking 6 out of 6 according to our Quality Assessment code.
Figure 1. Predicted 3D structure of SPINK8 inhibitor Visualized on Pymol.
Docking
ΔG = -25.0
Figure 2. Docked structure of HtrA1 with SPINK8 inhibitor Visualized on Pymol.
Mathematical modeling
Transcription rate and translation rate under T7 promotor
the mathematical modeling was based on our code for the calculation of transcription and translation (you can find it in the code section) beside with the estimated results from the wet lab.
Figure 3. this figure shows the results from the transcription and translation code showing the
variation of mRNA and protein concentrations with time compared with the wet lab results.
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.
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