Heterologous expression and functional characterization of cysteamine dioxygenase from the deep-sea mussel Bathymodiolus septemdierum

Heterologous expression and functional characterization of cysteamine dioxygenase from the deep-sea mussel Bathymodiolus septemdierum
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深海贻贝Bathymodiolus septemdierum半胱胺双加氧酶的异源表达和功能表征

DOI:
10.1007/s12562-023-01674-w
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发表时间:
2023
期刊:
影响因子:
1.9
通讯作者:
Inoue Koji
Inoue Koji
中科院分区:
农林科学4区
文献类型:
--
作者:
Yoda Kotaro;Takagi Toshiyuki;Koito Tomoko;Okai Masahiko;Makita Hiroko;Mitsunobu Satoshi;Yoshida Takao;Inoue Koji

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在居住在热液喷口地区的无脊椎动物中,牛磺酸的前体亚牛磺酸被认为可以减轻喷口流体中硫化氢的毒性。关于无脊椎动物次牛磺酸合成途径的信息有限,尽管在哺乳动物中已知有两种途径,半胱胺[2-氨基乙硫醇(AET)]途径和半胱氨酸亚硫酸盐(CsA)途径。在这项研究中,我们克隆了AET途径的中心酶--AET双加氧酶(ADO)的编码基因。在编码蛋白(BsADO)中,包括金属结合组氨酸在内的重要功能残基是保守的。在最大似然系统发育分析中,BsADO与其他无脊椎动物的ADO聚在一起。通过逆转录聚合酶链式反应,在所有相似水平的组织中都检测到了BsADOmRNA,这表明它的功能与CsA途径不同,主要在鳃中表达。带有His标签的BsADO在有Fe2+存在的情况下在大肠杆菌中表达,将AET转化为次牛磺酸,但在没有铁的情况下表达的BsADO活性较低。BsADO在pH 8-11,0℃-37℃,20℃时活性最高。这是首次在海洋无脊椎动物中表达ADO的功能特征。
In invertebrates inhabiting hydrothermal vent areas, hypotaurine, a precursor of taurine, is thought to mitigate the toxicity of hydrogen sulfide in vent fluids. Information about hypotaurine synthesis pathways in invertebrates is limited, although two pathways, the cysteamine [2-aminoethanethiol (AET)] pathway and the cysteine sulfinate (CSA) pathway are known in mammals. In this study, we cloned a cDNA encoding AET dioxygenase (ADO), the central enzyme of the AET pathway, from the vent musselBathymodiolus septemdierum. In the encoded protein (BsADO), functionally important residues, including metal-binding histidines, are conserved. In maximum likelihood phylogenetic analysis,BsADO clustered with ADOs of other invertebrates. By reverse transcription PCR,BsADOmRNA was detected in all tissues examined at similar levels, suggesting that its function is distinct from that of the CSA pathway, predominantly expressed in the gill.BsADO with a His tag, expressed inEscherichia coliin the presence of Fe2+, converted AET to hypotaurine, butBsADO expressed in the absence of iron exhibited lower activity.BsADO was active from pH 8 to 11, and from 0 °C to 37 °C, with a peak at 20 °C. This is the first functional characterization ofADOin marine invertebrates.
深海贻贝 Bathymodiolus septemdierum 的 GABA 转运蛋白 GAT-1 的功能特征。
DOI: --
发表时间: 2019
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