A key component Rxt3 in the Rpd3L histone deacetylase complex regulates development, stress tolerance, amylase production and kojic acid synthesis in Aspergillus oryzae.

IF 2 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biotechnology Letters Pub Date : 2024-07-31 DOI:10.1007/s10529-024-03515-x

Chaofeng Chang, Herui Wang, Yiling Liu, Yiting Xie, Dingxiang Xue, Feng Zhang

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Abstract

Rpd3L is a highly conserved histone deacetylase complex in eukaryotic cells and participates in various cellular processes. However, the roles of the Rpd3L component in filamentous fungi remain to be delineated ultimately. In this study, we constructed two knockout mutants of Rpd3L's Rxt3 subunit and characterized their biological functions in A. oryzae. Phenotypic analysis showed that AoRxt3 played a positive role in hyphal growth and conidia formation. Deletion of Aorxt3 resulted in augmented tolerance to multiple stresses, including cell wall stress, cell membrane stress, endoplasmic reticulum stress, osmotic stress and oxidative stress. Noteworthily, we found that Aorxt3-deleting mutants showed a higher kojic acid production than the control strain. However, the loss of Aorxt3 led to a significant decrease in amylase synthesis. Our findings lay the foundation for further exploring the role of other Rpd3L subunits and provide a new strategy to improve kojic acid production in A. oryzae.

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Rpd3L 组蛋白去乙酰化酶复合物中的一个关键成分 Rxt3 调节黑曲霉的发育、抗逆性、淀粉酶的产生和曲酸的合成。

Rpd3L 是真核细胞中高度保守的组蛋白去乙酰化酶复合物，参与各种细胞过程。然而，Rpd3L 成分在丝状真菌中的作用仍有待最终确定。在这项研究中，我们构建了两个 Rpd3L 的 Rxt3 亚基敲除突变体，并鉴定了它们在 A. oryzae 中的生物学功能。表型分析表明，AoRxt3 在头状花序生长和分生孢子形成过程中发挥了积极作用。缺失 Aorxt3 会增强对多种胁迫的耐受性，包括细胞壁胁迫、细胞膜胁迫、内质网胁迫、渗透胁迫和氧化胁迫。值得注意的是，我们发现 Aorxt3 缺失突变体的曲酸产量高于对照菌株。然而，Aorxt3的缺失导致淀粉酶合成显著减少。我们的发现为进一步探索其他 Rpd3L 亚基的作用奠定了基础，并为提高 A. oryzae 的曲酸产量提供了一种新策略。

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来源期刊

Biotechnology Letters 工程技术-生物工程与应用微生物

CiteScore

5.90

自引率

3.70%

发文量

108

审稿时长

1.2 months

期刊介绍： Biotechnology Letters is the world’s leading rapid-publication primary journal dedicated to biotechnology as a whole – that is to topics relating to actual or potential applications of biological reactions affected by microbial, plant or animal cells and biocatalysts derived from them. All relevant aspects of molecular biology, genetics and cell biochemistry, of process and reactor design, of pre- and post-treatment steps, and of manufacturing or service operations are therefore included. Contributions from industrial and academic laboratories are equally welcome. We also welcome contributions covering biotechnological aspects of regenerative medicine and biomaterials and also cancer biotechnology. Criteria for the acceptance of papers relate to our aim of publishing useful and informative results that will be of value to other workers in related fields. The emphasis is very much on novelty and immediacy in order to justify rapid publication of authors’ results. It should be noted, however, that we do not normally publish papers (but this is not absolute) that deal with unidentified consortia of microorganisms (e.g. as in activated sludge) as these results may not be easily reproducible in other laboratories. Papers describing the isolation and identification of microorganisms are not regarded as appropriate but such information can be appended as supporting information to a paper. Papers dealing with simple process development are usually considered to lack sufficient novelty or interest to warrant publication.