東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Ice Formation and Solvent Nanoconfin...

Moreau, David Wayne.

FindBook

Google Book

Amazon

博客來

Ice Formation and Solvent Nanoconfinement in Protein Crystallography.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Ice Formation and Solvent Nanoconfinement in Protein Crystallography./
作者:	Moreau, David Wayne.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	228 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
標題:	Biophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27993978
ISBN:	9798641278179

Ice Formation and Solvent Nanoconfinement in Protein Crystallography.
Moreau, David Wayne.

Ice Formation and Solvent Nanoconfinement in Protein Crystallography. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 228 p.

Source: Dissertations Abstracts International, Volume: 81-12, Section: B.

Thesis (Ph.D.)--Cornell University, 2020.

This item must not be sold to any third party vendors.

X-ray crystallography is the predominant method for macromolecular structure determination. In this method, crystals are illuminated with intense X-ray radiation that damages the crystal. If crystals are cooled to cryogenic temperatures, the effects of radiation damage are greatly reduced. Since protein crystals are aqueous, cryocooling creates the possibility of crystalline ice formation. X-ray diffraction from ice is difficult to disentangle from the protein diffraction and if the ice is internal to the protein crystal, the expansion of solvent into ice degrades the crystal's order and subsequent diffraction quality. While there has been significant research into how to prevent ice formation, there has been very little research into the basic science of ice formation in macromolecular crystallography. The solvent within protein crystals is nanoconfined so the ice formation process should differ significantly from bulk-like solvent. Many open questions remain, such as what is a protein crystal's freezing point? Once the crystal has been cooled below this temperature, how long does it take for ice to form? When ice does form, what is its structure and how much solvent at the protein's surface is restricted from crystallizing? We performed experiments studying the ice formation process inside of protein crystals. The results from these experiments showed that freezing points are depressed, the structure of ice is stacking disordered and two monolayers of water remain uncrystallized at the protein's surface. Completely new results from our experiments show protein crystals can remain supercooled for 10's of seconds suggesting a dramatic suppression of ice nucleation rates unobserved in any other material. A novel observation was made while performing these experiments, following an expected initial contraction on cooling to temperatures as low as 220 K, apoferritin crystals expand to volumes as large or larger than their volumes at room-temperature. This serves as further evidence that the solvent inside of the protein crystals is in liquid form at temperatures above the protein-solvent glass transition. Using data deposited to the Protein Data Bank and the Integrated Resource for Reproducibility in Macromolecular Crystallography, we show that crystals with larger solvent cavities and percent solvent content are more susceptible to ice formation and the prevalence of hexagonal like ice has dramatically increased in the last 10 years.

ISBN: 9798641278179Subjects--Topical Terms:

518360
Biophysics.
Subjects--Index Terms:

Ice formation

Ice Formation and Solvent Nanoconfinement in Protein Crystallography.
LDR:03526nmm a2200325 4500 001 2270290
005 20200921070814.5
008 220629s2020 ||||||||||||||||| ||eng d
020 $a 9798641278179
035 $a (MiAaPQ)AAI27993978
035 $a AAI27993978
040 $a MiAaPQ $c MiAaPQ
100 1 $a Moreau, David Wayne. $3 3547663
245 1 0 $a Ice Formation and Solvent Nanoconfinement in Protein Crystallography.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 228 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
500 $a Advisor: Thorne, Rob.
502 $a Thesis (Ph.D.)--Cornell University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a X-ray crystallography is the predominant method for macromolecular structure determination. In this method, crystals are illuminated with intense X-ray radiation that damages the crystal. If crystals are cooled to cryogenic temperatures, the effects of radiation damage are greatly reduced. Since protein crystals are aqueous, cryocooling creates the possibility of crystalline ice formation. X-ray diffraction from ice is difficult to disentangle from the protein diffraction and if the ice is internal to the protein crystal, the expansion of solvent into ice degrades the crystal's order and subsequent diffraction quality. While there has been significant research into how to prevent ice formation, there has been very little research into the basic science of ice formation in macromolecular crystallography. The solvent within protein crystals is nanoconfined so the ice formation process should differ significantly from bulk-like solvent. Many open questions remain, such as what is a protein crystal's freezing point? Once the crystal has been cooled below this temperature, how long does it take for ice to form? When ice does form, what is its structure and how much solvent at the protein's surface is restricted from crystallizing? We performed experiments studying the ice formation process inside of protein crystals. The results from these experiments showed that freezing points are depressed, the structure of ice is stacking disordered and two monolayers of water remain uncrystallized at the protein's surface. Completely new results from our experiments show protein crystals can remain supercooled for 10's of seconds suggesting a dramatic suppression of ice nucleation rates unobserved in any other material. A novel observation was made while performing these experiments, following an expected initial contraction on cooling to temperatures as low as 220 K, apoferritin crystals expand to volumes as large or larger than their volumes at room-temperature. This serves as further evidence that the solvent inside of the protein crystals is in liquid form at temperatures above the protein-solvent glass transition. Using data deposited to the Protein Data Bank and the Integrated Resource for Reproducibility in Macromolecular Crystallography, we show that crystals with larger solvent cavities and percent solvent content are more susceptible to ice formation and the prevalence of hexagonal like ice has dramatically increased in the last 10 years.
590 $a School code: 0058.
650 4 $a Biophysics. $3 518360
653 $a Ice formation
653 $a Solvent nanoconfinement
653 $a Protein crystallography
690 $a 0786
710 2 $a Cornell University. $b Applied Physics. $3 3192645
773 0 $t Dissertations Abstracts International $g 81-12B.
790 $a 0058
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27993978