Kinetic Studies on Allosteric Properties of Honeybee alpha-Glucosidase
| Project/Area Number |
02660074
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
応用生物化学・栄養化学
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| Research Institution | Hokkaido University |
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Principal Investigator |
CHIBA Seiya Hokkaido University, Faculty of Agriculture Professor, 農学部, 教授 (30001449)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Honeybee / alpha-Glucosidase / Allosteric effect / Cooperativity / αーグルコンダ-ゼ |
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| Research Abstract |
(1)Three kinds of alpha-glucosidases(HbG-I, HbG-II and HbG-III)were purified from honeybee. In addition, an alpha-glucosidase was also purified from honey.
(2)HbG-I, II and III were immunologically confirmed to be distributed in ventriculus, hemolymph(and also ventriculus)and hypopharyngeal gland, respectively. The alpha-glucosidase from honey was identified to be the same enzyme as HbG-III.
(3)HbG-I and II showed allosteric behaviors. These two enzymes were regarded as so-called hysteretic enzyme which showed a relatively slow conformational change in second or minute order.
(4)The subsites affinities in active site of HbG-I, II and III were evaluated. Subsite 1, 2 and 3 having positive values in three enzymes were considered to be effective for binding of substrate to active site.
(5)Honeybee alpha-glucosidase, which is the same enzyme as HbG-III, was considered to be secreted into honeydew from hypopharyngeal gland.
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Report
(3 results)
Research Products
(21 results)
