产纤维素酶菌群的筛选及产酶特性机理的研究
Screening of cellulase-producing microbial communities and study on the characteristics and mechanisms of enzyme production
为农业固体废弃物的资源化利用提供高效菌种资源,采用了刚果红染色初筛和纤维素酶活测定复筛相结合的方法,从学校周边湖泊的腐殖土中筛选获得一株高产纤维素酶菌群(CTS)。宏基因组学分析显示,其优势菌属为栓孔菌属(Trametes)、帚枝霉属(Sarocladium)和革孔菌属(Pilatotrama)。通过单因素实验及响应面法优化产酶条件,确定最优条件为:玉米芯添加量4%(质量体积比,w/v)、蛋白胨添加量0.2%(w/v)、初始pH=4.66、培养温度29.60℃、培养时间3.16 d。优化后,菌群CTS的内切葡聚糖酶(CMCase)、β-葡萄糖苷酶(β-glucosidase)、滤纸酶(FPase)活力分别提升至49.1、46.8 U/mL和53.1 U/mL,较初始条件显著提升了60.24%、75.47%、93.53%。结合三维荧光光谱(3D-EEM)与碳水化合物活性酶(CAZy)的分析,揭示了菌群的高效产酶机制的特性,为资源化利用提供了优良的微生物菌种。
Providing efficient microbial resources for the agricultural solid waste utilization,employed a combination of Congo red staining for preliminary screening and cellulase activity assay for secondary screening to isolate a high-yield cellulase-producing microbial consortium,CTS,from humus soil around a lakeside near the university.Metagenomic analysis revealed that the dominant genera in CTS were Trametes,Sarocladium,and Pilatotrama.Through single-factor experiments and response surface methodology (RSM),the optimal enzyme production conditions were determined as follows:corn cob addition of 4% (w/v),peptone addition of 0.2% (w/v),initial pH of 4.66,cultivation temperature 29.60℃,and cultivation time 3.16 days.After optimization,the endoglucanase (CMCase),-glucosidase,and filter paper enzyme (FPase) activities of the CTS consortium significantly increased to 49.1 U/mL,46.8 U/mL,and 53.1 U/mL,respectively,representing remarkable improvements of 60.24%,75.47%,and 93.53% compared to the initial conditions.Integrated analysis using three-dimensional excitation-emission matrix (3D-EEM) spectroscopy and carbohydrate-active enzymes (CAZy) annotation elucidated the high-efficiency enzyme production characteristics of the consortium,providing an excellent microbial resource for agricultural waste valorization.
纤维素酶 / 产酶优化 / 响应面法 / 混合菌群 / 产酶机制
cellulase / enzyme production optimization / response surface methodology / mixed microbial consortium / enzyme production mechanism
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
周礼, 庄文颖. 高产纤维素酶的木霉菌株筛选及发酵条件优化[J]. 菌物学报, 2023, 42(9):1966-1988. |
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
张欢, 寇巍, 王晓明, |
| [17] |
|
| [18] |
|
| [19] |
华彬彬. 分解木质纤维素复合菌系的形成机理及应用[D]. 北京: 中国农业大学, 2023. |
| [20] |
|
| [21] |
|
| [22] |
张晶, 钱玉婷, 曲萍, |
| [23] |
|
| [24] |
|
| [25] |
杨瑞恒, 李燕, 唐利华, |
| [26] |
孙江慧, 张楠, 沈其荣, |
| [27] |
常帅飞, 任文义, 程雨辰, |
| [28] |
|
| [29] |
|
| [30] |
|
/
| 〈 |
|
〉 |