从尼加塔的自然界中分离和描述菌 (Aspergillus oryzae) 的特征
Kanae Sakai1, Keigo Sato2, Mitsuoki Kaneoke2
1Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Journal of bioscience and bioengineering
|September 3, 2024
概括
研究人员在日本隔离了环境中的Aspergillus oryzae菌株,发现了26个非亚黄毒素生产商. 基因和酶分析揭示了多样化的特性,扩大了可济模具的潜在工业应用.
科学领域:
- 微生物学 微生物学
- 食品科学 食品科学 食品科学
- 生物技术是生物技术.
背景情况:
- 菌 (Aspergillus oryzae) 对于日本的发酵和造至关重要.
- 对A. oryzae的环境隔离可以产生具有独特特性的菌株.
研究的目的:
- 为了隔离和表征来自尼加塔县的环境菌株.
- 评估孤立菌株的真菌毒素生产和发酵能力.
- 探索这些多样化的菌株在工业应用中的潜力.
主要方法:
- 从环境样本中分离Aspergillus部分Flavi类菌株,使用大米木灰介质.
- 形态特征,ITS和calmodulin基因的测序,以及对亚毒素生物合成基因群和α-amylase基因的分析.
- 对菌毒素生物合成基因集群 (亚拉托克素,环亚松酸,亚拉特雷姆) 和与发酵相关的基因进行DNA序列分析.
- 酶活性测定和基于形态和交配类型的分类.
主要成果:
- 36 Aspergillus 节 获得了类似于Flavi的菌株,其中26个被证实为非亚毒素生产者.
- 基因分析证实了某些菌株中没有菌毒素的产生,但酶活性变异并不能完全由氨基酸替代解释.
- 26个分离物被分为6种形态类型,显示形态,酶型和基因序列之间的相关性.
- 在环境koji模具分离物中观察到显著的特性多样性.
结论:
- 环境隔离产生了多样化的Aspergillus oryzae菌株,具有工业用途的潜力.
- 了解 koji 菌的遗传和酶多样性是优化发酵过程的关键.
- 对这些菌株的进一步研究可能会扩大科吉模具的工业应用.
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