Difference between revisions of "Part:BBa K3113051"
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<p align="center"><b>Figure 2:</b> Reaction mechanism of YcdW </p> <br>
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Revision as of 14:44, 20 October 2019


CD63_Ser161_6xHis

To facilitate the purification of intact exosomes, we engineered the exosomal marker CD63 by integrating a polyhistidine repeat into the large extracellular loop of the tetraspanin. Based on SWISS-MODEL, a protein structure homology-modelling server, we were able to model CD63 and to search for sites within CD63 that are accessible.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]


Usage

This part was designed to allow the purification of exosomes via affinity chromatography. The exosomal marker protein CD63 belongs to the family of tetraspanins and is therefore composed of four alpha-helical transmembrane domains with two extracellular loops. Both the N- and the C-terminus point towards the inside of exosomes, rendering terminal His-tagging useless for affinity purification of exosomes. Therefore, we innovatively fused a 6xHis-tag to an external loop of the exosomal marker CD63. Specifically, the 6 histidines were added after position Ser161 based on a structural model for CD63[1] generated with swissmodel.expasy.org[2] and based on the structure of the related tetraspanin CD81[3]. To our knowledge, Ni-NTA affinity chromatography has not been previously been used to purify exosomes, it has only been applied to other His-tagged membrane structures (Alves et al 2017). BBa_K3113051 is thus an improvement from iGEM 2018 XJTLU-China's part BBa_K2619003[4], which just contains the human CD63 sequence

ycdW CD63“ width=

Figure 2: Reaction mechanism of YcdW



Biology

CD63 is a Tetraspanine. Tetraspanins are a superfamily of cell surface-associated membrane proteins with four transmembrane domains. CD63 was the first characterized Tetraspanine. It is abundantly present in late endosomes and lysosomes as well as exosomes. The gene is located on the human chromosome 12q13. Although the intracellular function of CD63 remains to be established, a number of studies performed in different cell types implicate a role for CD63 in intracellular transport of other proteins.[1]

Characterisation

References

  1. ↑ Trafficking and function of the tetraspanin CD63 Cell Microscopy Center, Department of Cell Biology and Institute of Biomembranes, University Medical Center Utrecht, Heidelberglaan 100, 3584CX Utrecht, The Netherlands Received 16 September 2008, Accepted 23 September 2008, Available online 7 October 2008.