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Pressure Adaptations in Deep-Sea Dihydrofolate Reductases.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Pressure Adaptations in Deep-Sea Dihydrofolate Reductases./
作者:
Penhallurick, Ryan W.
面頁冊數:
1 online resource (204 pages)
附註:
Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
Contained By:
Dissertations Abstracts International83-11B.
標題:
Biophysics. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29165139click for full text (PQDT)
ISBN:
9798426835849
Pressure Adaptations in Deep-Sea Dihydrofolate Reductases.
Penhallurick, Ryan W.
Pressure Adaptations in Deep-Sea Dihydrofolate Reductases.
- 1 online resource (204 pages)
Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
Thesis (Ph.D.)--Georgetown University, 2022.
Includes bibliographical references
Deep-sea organisms must have proteins that function under high hydrostatic pressure to survive. Adaptations used in proteins from "pressure-loving" piezophiles may include greater compressibility or greater stability against pressure-induced destabilization. Here, adaptations to temperature and pressure in the ubiquitous enzyme dihydrofolate reductase from several deep-sea microbes are examined with molecular dynamics computer simulations and high pressure small angle neutron and X-ray scattering. A mechanism of how addition of a single methylene from Asp27 in DHFR of the piezosensitive mesophile E. coli to Glu27, which was originally identified in a DHFR from a moderate piezophile M. profunda, may alleviate improper overcorrelated motions at compressive pressures is discussed, along with experimental comparisons of pressure effects on these enzymes. Enhanced stability and a mechanism for prevention of internal cavity solvation under significantly elevated pressure in DHFR from a hyperpiezophile isolated from the Marianas Trench is also proposed. This work aims to provide insight into pressure adaptations employed in various deep-sea dihydrofolate reductases to expand on how enzymes from piezophiles balance flexibility and stability to maintain proper functioning at elevated pressure.
Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023
Mode of access: World Wide Web
ISBN: 9798426835849Subjects--Topical Terms:
518360
Biophysics.
Subjects--Index Terms:
Deep-sea adaptationsIndex Terms--Genre/Form:
542853
Electronic books.
Pressure Adaptations in Deep-Sea Dihydrofolate Reductases.
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Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
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Advisor: Ichiye, Toshiko.
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Deep-sea organisms must have proteins that function under high hydrostatic pressure to survive. Adaptations used in proteins from "pressure-loving" piezophiles may include greater compressibility or greater stability against pressure-induced destabilization. Here, adaptations to temperature and pressure in the ubiquitous enzyme dihydrofolate reductase from several deep-sea microbes are examined with molecular dynamics computer simulations and high pressure small angle neutron and X-ray scattering. A mechanism of how addition of a single methylene from Asp27 in DHFR of the piezosensitive mesophile E. coli to Glu27, which was originally identified in a DHFR from a moderate piezophile M. profunda, may alleviate improper overcorrelated motions at compressive pressures is discussed, along with experimental comparisons of pressure effects on these enzymes. Enhanced stability and a mechanism for prevention of internal cavity solvation under significantly elevated pressure in DHFR from a hyperpiezophile isolated from the Marianas Trench is also proposed. This work aims to provide insight into pressure adaptations employed in various deep-sea dihydrofolate reductases to expand on how enzymes from piezophiles balance flexibility and stability to maintain proper functioning at elevated pressure.
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