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中间型布鲁氏菌IITR130水解酶对聚对苯二甲酸乙二酯的酶促降解及其基因组解析

Enzymatic degradation of PET by hydrolase from Brucella intermedia IITR130 and its genomic insights.

作者信息

Srivastava Pallavi, Singh Saurabh, Soni Mohini, Pratap J Venkatesh, Subramanian Srikrishna, Manickam Natesan

机构信息

Environmental Biotechnology Laboratory, Food, Drug & Chemical, Environment and Systems Toxicology (FEST) Division, Environmental Toxicology Group, CSIR-Indian Institute of Toxicology Research, Vishvigyan Bhawan, 31 Mahatma Gandhi Marg, Lucknow, Uttar Pradesh, 226001, India.

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India.

出版信息

Biodegradation. 2025 May 17;36(3):45. doi: 10.1007/s10532-025-10141-5.

Abstract

Plastic pollution, particularly from polyethylene terephthalate (PET), has become a significant environmental concern, necessitating innovative and sustainable degradation strategies. The present study provides valuable perspectives on the genomic and functional characteristics of Brucella intermedia IITR130, a bacterium capable of degrading PET. Hybrid genome sequencing of IITR130 resulted in identification of two chromosomes combining 4.59 Mbp size. Genomic annotation revealed occurrence of key enzymes involved in the PET sheet biodegradation pathway, including hydrolases, ring hydroxylating dioxygenases, protocatechuate 3,4 dioxygenases, genes for metabolism of several other natural and synthetic plastic. A hydrolase gene Hy1 of 24 kDa, was identified, expressed, and characterized, demonstrating an optimal catalytic activity at 37 °C and pH 8.5. Scanning electron microscopy (SEM) and fourier-transform infrared spectroscopy (FTIR) confirmed substantial degradation of PET surfaces treated with Hy1 protein, resulted in surface erosion, crack formation, and functional group modifications in the range 2150-2550 cm⁻ and 2950-3350 cm⁻ suggestive of O=C=O stretching and O-H stretching respectively. Monomethyl terephthalate (MMT) and terephthalic acid (TPA) were identified as PET degradation metabolites formed by strain IITR130. Fluorescence quenching showed higher substrate affinity for bis(2-hydroxyethyl) terephthalate (BHET) (K = 148.2) than terephthalic acid (TPA) (K = 674). Moreover, phylogenetic analysis of Hy1 protein revealed that Hy1 containing conserved catalytic triad (Ser, His, Asp) belonging to the family III of hydrolase enzyme sharing a clade with PET degrading hydrolase PETase from Ideonella sakaiensis. These results demonstrate the potential of B. intermedia IITR130 as an efficient biocatalyst for PET biodegradation which could be exploited appropriately for plastic waste management.

摘要

塑料污染,尤其是来自聚对苯二甲酸乙二酯(PET)的污染,已成为一个重大的环境问题,因此需要创新且可持续的降解策略。本研究提供了关于中间布鲁氏菌IITR130的基因组和功能特性的宝贵观点,该细菌能够降解PET。对IITR130进行混合基因组测序后,鉴定出两条染色体,总大小为4.59 Mbp。基因组注释显示,PET片材生物降解途径中涉及的关键酶存在,包括水解酶、环羟基化双加氧酶、原儿茶酸3,4 - 双加氧酶,以及其他几种天然和合成塑料代谢的基因。一个24 kDa的水解酶基因Hy1被鉴定、表达并进行了表征,其在37°C和pH 8.5时表现出最佳催化活性。扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)证实,用Hy1蛋白处理的PET表面发生了大量降解,导致表面侵蚀、裂纹形成,以及在2150 - 2550 cm⁻和2950 - 3350 cm⁻范围内的官能团修饰,分别暗示了O = C = O伸缩振动和O - H伸缩振动。单甲基对苯二甲酸(MMT)和对苯二甲酸(TPA)被鉴定为菌株IITR130形成的PET降解代谢产物。荧光猝灭显示,该菌株对双(2 - 羟乙基)对苯二甲酸(BHET)(K = 148.2)的底物亲和力高于对苯二甲酸(TPA)(K = 674)。此外,对Hy1蛋白的系统发育分析表明,Hy1含有保守的催化三联体(Ser、His、Asp),属于水解酶家族III,与来自日本 Ideonella sakaiensis的PET降解水解酶PETase共享一个进化枝。这些结果证明了中间布鲁氏菌IITR130作为PET生物降解高效生物催化剂的潜力,可将其适当地用于塑料废物管理。

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