Isolation and characterization of a secreted, cell-surface glycoprotein SCUBE2 from humans

Ming Tzu Tsai, Chien Jui Cheng, Yuh Charn Lin, Chun Chuan Chen, Ann Ru Wu, Min Tzu Wu, Cheng Chin Hsu, Ruey Bing Yang

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

SCUBE2 [signal peptide, CUB domain, EGF (epidermal growth factor)-like protein 2] belongs to an evolutionarily conserved SCUBE protein family, which possesses domain organization characteristic of an N-terminal signal peptide sequence followed by nine EGF-like repeats, a spacer region, three cysteine-rich repeat motifs, and one CUB domain at the C-terminus. Despite several genetic analyses suggesting that the zebrafish orthologue of the mammalian SCUBE2 gene participates in HH (Hedgehog) signalling, the complete full-length cDNA and biochemical function for mammalian SCUBE2 on HH signalling remains uninvestigated. In the present study, we isolated the full-length cDNA and studied the role of human SCUBE2 in the HH signalling cascade. When overexpressed, recombinant human SCUBE2 manifests as a secreted surface-anchored glycoprotein. Deletion mapping analysis defines the critical role of the spacer region and/or cysteine-rich repeats for membrane association. Further biochemical analyses and functional reporter assays demonstrated that human SCUBE2 can specifically interact with SHH (Sonic Hedgehog) and SHH receptor PTCH1 (Patched-1), and enhance the SHH signalling activity within the cholesterolrich raft microdomains of the plasma membranes. Together, our results reveal that human SCUBE2 is a novel positive component of the HH signal, acting upstream of ligand binding at the plasma membrane. Thus human SCUBE2 could play important roles in HH-related biology and pathology, such as during organ development and tumour progression.

Original languageEnglish
Pages (from-to)119-128
Number of pages10
JournalBiochemical Journal
Volume422
Issue number1
DOIs
Publication statusPublished - Aug 15 2009

Fingerprint

Hedgehogs
Membrane Glycoproteins
Cell membranes
Protein Sorting Signals
Cysteine
Complementary DNA
Pathology
Epidermal Growth Factor
Tumors
Assays
Glycoproteins
Genes
Cell Membrane
Association reactions
Ligands
Membranes
Zebrafish
Proteins

Keywords

  • Cell-surface protein
  • CUB domain
  • Epidermal growth factor-like repeat (EGF-like repeat)
  • Glycoprotein
  • Signal transduction
  • Sonic Hedgehog

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Tsai, M. T., Cheng, C. J., Lin, Y. C., Chen, C. C., Wu, A. R., Wu, M. T., ... Yang, R. B. (2009). Isolation and characterization of a secreted, cell-surface glycoprotein SCUBE2 from humans. Biochemical Journal, 422(1), 119-128. https://doi.org/10.1042/BJ20090341

Isolation and characterization of a secreted, cell-surface glycoprotein SCUBE2 from humans. / Tsai, Ming Tzu; Cheng, Chien Jui; Lin, Yuh Charn; Chen, Chun Chuan; Wu, Ann Ru; Wu, Min Tzu; Hsu, Cheng Chin; Yang, Ruey Bing.

In: Biochemical Journal, Vol. 422, No. 1, 15.08.2009, p. 119-128.

Research output: Contribution to journalArticle

Tsai, MT, Cheng, CJ, Lin, YC, Chen, CC, Wu, AR, Wu, MT, Hsu, CC & Yang, RB 2009, 'Isolation and characterization of a secreted, cell-surface glycoprotein SCUBE2 from humans', Biochemical Journal, vol. 422, no. 1, pp. 119-128. https://doi.org/10.1042/BJ20090341
Tsai, Ming Tzu ; Cheng, Chien Jui ; Lin, Yuh Charn ; Chen, Chun Chuan ; Wu, Ann Ru ; Wu, Min Tzu ; Hsu, Cheng Chin ; Yang, Ruey Bing. / Isolation and characterization of a secreted, cell-surface glycoprotein SCUBE2 from humans. In: Biochemical Journal. 2009 ; Vol. 422, No. 1. pp. 119-128.
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