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Related Experiment Videos

A signal sequence detection system using secreted protease activity as an indicator

M Yokoyama-Kobayashi1, S Sugano, T Kato

  • 1Kanagawa Academy of Science and Technology (KAST), Japan.

Gene
|October 3, 1995
PubMed
Summary

We created a new tool, pSSD1, to identify signal sequences (Ss) in secreted proteins. This method detects intact Ss by measuring fibrinolytic activity, aiding in the discovery of secreted and membrane proteins.

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Area of Science:

  • Molecular Biology
  • Protein Secretion
  • Gene Expression Vectors

Background:

  • Secretory signal sequences (Ss) are crucial for protein targeting to secretion pathways.
  • Efficiently identifying cDNAs encoding secreted or membrane proteins is essential in molecular biology.

Purpose of the Study:

  • To develop a novel expression vector, pSSD1, for detecting cDNA fragments encoding functional secretory signal sequences (Ss).
  • To validate the utility of pSSD1 in identifying secreted proteins through a reporter gene assay.

Main Methods:

  • Construction of the pSSD1 expression vector containing a human urokinase-type plasminogen activator (u-PA) protease domain reporter gene.
  • Insertion of various cDNA fragments encoding putative Ss upstream of the u-PA reporter gene.
  • Transfection of monkey COS7 cells with engineered plasmids and assessment of secreted fibrinolytic activity.

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Main Results:

  • Fibrinolytic activity was detected in the culture medium only when intact secretory signal sequences were present.
  • The pSSD1 vector successfully identified functional Ss, demonstrating its efficacy.
  • Chimeric proteins were produced in transfected cells, with activity correlating to Ss integrity.

Conclusions:

  • The pSSD1 vector provides a reliable system for detecting cDNA fragments encoding functional secretory signal sequences.
  • This approach is valuable for identifying cDNAs of secreted proteins and type-I membrane proteins.
  • The developed system facilitates research in protein trafficking and secretion pathways.