C-mannosylation of human hyaluronidase 1: Possible roles for secretion and enzymatic activity

  • Authors:
    • Yuki Goto
    • Yuki Niwa
    • Takehiro Suzuki
    • Naoshi Dohmae
    • Kazuo Umezawa
    • Siro Simizu
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  • Published online on: May 12, 2014     https://doi.org/10.3892/ijo.2014.2438
  • Pages: 344-350
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Abstract

Protein glycosylation, one of the post-translational modifications, is important for many protein functions, such as protein stability, folding and secretion. In the protein glycosylation, C-mannosylation was first identified in ribonuclease 2, and some proteins have been reported to be C-mannosylated; however, effects of its modifications for target proteins remain unclear. Hyaluronidase 1 (HYAL1), degrading hyaluronic acid (HA), has two predicted C-mannosylation sites at Trp130 and Trp321. In this study, we examined whether HYAL1 is C-mannosylated or not, and the effect of C-mannosylation on HYAL1. Using mass spectrometry, we first demonstrated that intracellular HYAL1 is C-mannosylated at Trp130 but not at Trp321. Surprisingly, although HYAL1 was secreted into conditioned medium and it possessed enzymatic activity, secreted HYAL1 was not C-mannosylated. Computer simulation demonstrated that C-mannosylation of HYAL1 at Trp130 changed conformation of the catalytic active site, and faced Glu131 in the opposite direction toward its substrate, HA, indicating that C-mannosylation will negatively regulate its secretion, and will attenuate its enzymatic activity. Taken together, this is the first report that demonstrates the presence of C-mannosylation among HYAL family proteins, and our results suggest possible roles of C-mannosylation for secretion and enzymatic activity.
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July-2014
Volume 45 Issue 1

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Goto Y, Niwa Y, Suzuki T, Dohmae N, Umezawa K and Simizu S: C-mannosylation of human hyaluronidase 1: Possible roles for secretion and enzymatic activity. Int J Oncol 45: 344-350, 2014
APA
Goto, Y., Niwa, Y., Suzuki, T., Dohmae, N., Umezawa, K., & Simizu, S. (2014). C-mannosylation of human hyaluronidase 1: Possible roles for secretion and enzymatic activity. International Journal of Oncology, 45, 344-350. https://doi.org/10.3892/ijo.2014.2438
MLA
Goto, Y., Niwa, Y., Suzuki, T., Dohmae, N., Umezawa, K., Simizu, S."C-mannosylation of human hyaluronidase 1: Possible roles for secretion and enzymatic activity". International Journal of Oncology 45.1 (2014): 344-350.
Chicago
Goto, Y., Niwa, Y., Suzuki, T., Dohmae, N., Umezawa, K., Simizu, S."C-mannosylation of human hyaluronidase 1: Possible roles for secretion and enzymatic activity". International Journal of Oncology 45, no. 1 (2014): 344-350. https://doi.org/10.3892/ijo.2014.2438