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  Mechanism for release of alkaline phosphatase caused by glycosylphosphatidylinositol deficiency in patients with hyperphosphatasia mental retardation syndrome

Murakami, Y., Kanzawa, N., Saito, K., Krawitz, P. M., Mundlos, S., Robinson, P. N., et al. (2012). Mechanism for release of alkaline phosphatase caused by glycosylphosphatidylinositol deficiency in patients with hyperphosphatasia mental retardation syndrome. The Journal of Biological Chemistry, 287(9), 6318-6325. doi:10.1074/jbc.M111.331090.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-F272-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-F273-8
Genre: Journal Article

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 Creators:
Murakami, Y., Author
Kanzawa, N., Author
Saito, K., Author
Krawitz, P. M., Author
Mundlos, S.1, Author              
Robinson, P. N.1, Author              
Karadimitris, A., Author
Maeda, Y., Author
Kinoshita, T., Author
Affiliations:
1Research Group Development & Disease (Head: Stefan Mundlos), Max Planck Institute for Molecular Genetics, Max Planck Society, Berlin, Germany, ou_1433557              

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Free keywords: Alkaline Phosphatase/blood/genetics/ metabolism Animals CHO Cells Cell Adhesion Molecules/metabolism Cricetinae Cricetulus Glycosylphosphatidylinositols/blood/deficiency/genetics/metabolism Hemoglobinuria, Paroxysmal/blood/genetics/ metabolism Humans Hyperphosphatemia/genetics/ metabolism Intellectual Disability/genetics/ metabolism Mannosyltransferases/chemistry/ genetics Protein Sorting Signals/physiology Protein Structure, Tertiary Syndrome
 Abstract: Hyperphosphatasia mental retardation syndrome (HPMR), an autosomal recessive disease characterized by mental retardation and elevated serum alkaline phosphatase (ALP) levels, is caused by mutations in the coding region of the phosphatidylinositol glycan anchor biosynthesis, class V (PIGV) gene, the product of which is a mannosyltransferase essential for glycosylphosphatidylinositol (GPI) biosynthesis. Mutations found in four families caused amino acid substitutions A341E, A341V, Q256K, and H385P, which drastically decreased expression of the PIGV protein. Hyperphosphatasia resulted from secretion of ALP, a GPI-anchored protein normally expressed on the cell surface, into serum due to PIGV deficiency. In contrast, a previously reported PIGM deficiency, in which there is a defect in the transfer of the first mannose, does not result in hyperphosphatasia. To provide insights into the mechanism of ALP secretion in HPMR patients, we took advantage of CHO cell mutants that are defective in various steps of GPI biosynthesis. Secretion of ALP requires GPI transamidase, which in normal cells, cleaves the C-terminal GPI attachment signal peptide and replaces it with GPI. The GPI-anchored protein was secreted substantially into medium from PIGV-, PIGB-, and PIGF-deficient CHO cells, in which incomplete GPI bearing mannose was accumulated. In contrast, ALP was degraded in PIGL-, DPM2-, or PIGX-deficient CHO cells, in which incomplete shorter GPIs that lacked mannose were accumulated. Our results suggest that GPI transamidase recognizes incomplete GPI bearing mannose and cleaves a hydrophobic signal peptide, resulting in secretion of soluble ALP. These results explain the molecular mechanism of hyperphosphatasia in HPMR.

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Language(s): eng - English
 Dates: 2012-01-062012-02-24
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1074/jbc.M111.331090
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Title: The Journal of Biological Chemistry
  Other : JBC
Source Genre: Journal
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Publ. Info: Baltimore, etc. : American Society for Biochemistry and Molecular Biology [etc.]
Pages: - Volume / Issue: 287 (9) Sequence Number: - Start / End Page: 6318 - 6325 Identifier: ISSN: 0021-9258
CoNE: https://pure.mpg.de/cone/journals/resource/954925410826_1