Different Pressure Resistance of Lactate Dehydrogenases from Hagfish is Dependent on Habitat Depth and Caused by Tetrameric Structure Dissociation |
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Authors: | Yoshikazu Nishiguchi Fumiyoshi Abe Mitsumasa Okada |
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Institution: | (1) Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi 274-8510, Japan;(2) Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan;(3) Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi 274-8510, Japan |
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Abstract: | The effects of high hydrostatic pressure on lactate dehydrogenase (LDH) activities from two species of hagfish were examined.
LDH from Eptatretus okinoseanus, a deep-sea species, retained 67% of the original activity even at 100 MPa. LDH activity from Eptatretus burgeri, a shallow-sea species, was completely lost at 50 MPa but recovered to the original value at 0.1 MPa. The tetrameric structure
of LDH-A4 from E. okinoseanus did not change at 50 MPa. In contrast, almost all LDH tetramers from E. burgeri dissociated to dimers and monomers at 50 MPa but reverted to tetramers at 0.1 MPa. These results show that the dissociation
of tetramers caused the inactivation of E. burgeri LDH. The difference depends on the number 6 and 10 amino acids. The mechanism of the slight, gradual inactivation of E. okinoseanus LDH at high pressure differs and is probably due to the metamorphosis of its inner structures. |
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