| Project/Area Number |
12670740
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Pediatrics
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| Research Institution | Gifu University |
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Principal Investigator |
SUKEGAWA Kazuko Gifu University School of Medicine, Research Associate, 医学部, 助手 (60115409)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Zenichiro Gifu University School of Medicine, Research Associate, 医学部・附属病院, 助手 (90303502)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2000: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | mucopolysaccharidoses / Hunter disease / Iduronate-2-sulfalase / mutation analysis / structural model |
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| Research Abstract |
Mucopolysaccharidosis II (Hunter disease), a lysosomal storage disorder caused by a deficiency of iduronate-2-sulfatase (IDS), has variable clinical phenotypes. Over 130 missense mutations were identified in the IDS gene from Hunter patients, but the correlation between genotype and phenotype has remained unclear.
1) Sixteen missense mutations were characterized by stable expression analysis. Mutant proteins found in the severe phenotype had no activity and mutants found in the milder phenotype had a considerable residual activity (0.1-2 % of wild-type IDS activity).
2) Sulfatases, including IDS, are members of a highly conserved gene family sharing an extensive sequence homology. Thus a tertiary structural model of IDS was constructed from the X-ray crystal structure of N-acetylgalactosamine-4-sulfatase, arylsulfatase and from a tertiary structural model of N-acetylgalactosamine-6 sulfatase, using homology modeling. The model structure of IDS had a monomeric form with two domains. The main structural feature of the larger domain was a beta-sheet with 10 strands sandwiched between alpha-helices. The smaller domain consisted of a four-stranded anti-parallel beta-sheet with an orthogonal alpha-helix.
Based on the tertiary structural model, we will reveal effects of mutations on IDS structure and function.
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