Characterization of βB2-crystallin tryptophan mutants reveals two different folding states in solution.

IF 4.5 3区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Protein Science Pub Date : 2024-07-01 DOI:10.1002/pro.5092
Jiayue Sun, Ken Morishima, Rintaro Inoue, Masaaki Sugiyama, Takumi Takata
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引用次数: 0

Abstract

Conserved tryptophan residues are critical for the structure and the stability of β/γ-crystallin in the lenses of vertebrates. During aging, in which the lenses are continuously exposed to ultraviolet irradiation and other environmental stresses, oxidation of tryptophan residues in β/γ-crystallin is triggered and impacts the lens proteins to varying degrees. Kynurenine derivatives, formed by oxidation of tryptophan, accumulate, resulting in destabilization and insolubilization of β/γ-crystallin, which correlates with age-related cataract formation. To understand the contribution of tryptophan modification on the structure and stability of human βB2-crystallin, five tryptophan residues were mutated to phenylalanine considering its similarity in structure and hydrophilicity to kynurenine. Among all mutants, W59F and W151F altered the stability and homo-oligomerization of βB2-crystallin-W59F promoted tetramerization whereas W151F blocked oligomerization. Most W59F dimers transformed into tetramer in a month, and the separated dimer and tetramer of W59F demonstrated different structures and hydrophobicity, implying that the biochemical properties of βB2-crystallin vary over time. By using SAXS, we found that the dimer of βB2-crystallin in solution resembled the lattice βB1-crystallin dimer (face-en-face), whereas the tetramer of βB2-crystallin in solution resembled its lattice tetramer (domain-swapped). Our results suggest that homo-oligomerization of βB2-crystallin includes potential inter-subunit reactions, such as dissociation, unfolding, and re-formation of the dimers into a tetramer in solution. The W>F mutants are useful in studying different folding states of βB2-crystallin in lens.

βB2-结晶素色氨酸突变体的表征揭示了溶液中两种不同的折叠状态。
保守的色氨酸残基对脊椎动物晶状体中β/γ-结晶素的结构和稳定性至关重要。在老化过程中,晶状体持续暴露于紫外线照射和其他环境压力下,β/γ-结晶素中的色氨酸残基会被氧化,并对晶状体蛋白质产生不同程度的影响。色氨酸氧化形成的犬尿氨酸衍生物会累积,导致β/γ-结晶素不稳定和不溶解,这与年龄相关性白内障的形成有关。为了了解色氨酸修饰对人βB2-结晶素结构和稳定性的影响,研究人员将五个色氨酸残基突变为苯丙氨酸,因为苯丙氨酸的结构和亲水性与犬尿氨酸相似。在所有突变体中,W59F和W151F改变了βB2-结晶素的稳定性和同源寡聚化--W59F促进了四聚体化,而W151F阻碍了寡聚化。大多数 W59F 二聚体在一个月内转化为四聚体,分离出的 W59F 二聚体和四聚体显示出不同的结构和疏水性,这意味着 βB2-crystallin 的生化性质会随着时间的推移而变化。通过 SAXS,我们发现溶液中的βB2-结晶素二聚体类似于晶格βB1-结晶素二聚体(面对面),而溶液中的βB2-结晶素四聚体类似于其晶格四聚体(结构域互换)。我们的研究结果表明,βB2-结晶素的同质异构化包括潜在的亚基间反应,如解离、解折叠以及二聚体在溶液中重新形成四聚体。W>F 突变体有助于研究晶状体中βB2-结晶素的不同折叠状态。
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来源期刊
Protein Science
Protein Science 生物-生化与分子生物学
CiteScore
12.40
自引率
1.20%
发文量
246
审稿时长
1 months
期刊介绍: Protein Science, the flagship journal of The Protein Society, is a publication that focuses on advancing fundamental knowledge in the field of protein molecules. The journal welcomes original reports and review articles that contribute to our understanding of protein function, structure, folding, design, and evolution. Additionally, Protein Science encourages papers that explore the applications of protein science in various areas such as therapeutics, protein-based biomaterials, bionanotechnology, synthetic biology, and bioelectronics. The journal accepts manuscript submissions in any suitable format for review, with the requirement of converting the manuscript to journal-style format only upon acceptance for publication. Protein Science is indexed and abstracted in numerous databases, including the Agricultural & Environmental Science Database (ProQuest), Biological Science Database (ProQuest), CAS: Chemical Abstracts Service (ACS), Embase (Elsevier), Health & Medical Collection (ProQuest), Health Research Premium Collection (ProQuest), Materials Science & Engineering Database (ProQuest), MEDLINE/PubMed (NLM), Natural Science Collection (ProQuest), and SciTech Premium Collection (ProQuest).
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