Mechanistic Studies of the Functional Consequences of Heterologous Expression of Actinomycetal Megasynthases

放线菌大合成酶异源表达功能后果的机制研究

基本信息

批准号：
10439127
负责人：
Joshua A Baccile
金额：
$ 43.18万
依托单位：
UNIVERSITY OF TENNESSEE KNOXVILLE
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-04-01 至 2025-03-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10439127
关键词：
Actinobacteria class Actinomycetales Address Affect Anabolism Antibiotics Bacillus subtilis Bacteria Biochemical Biological Models Cells Code Codon Nucleotides Communities Coupled Engineering Enzymatic Biochemistry Enzymes Erythromycin Polyketide Synthase Escherichia coli Failure Gene Expression Profile Genetic Genetic Transcription Genome Gold Growth Guanine + Cytosine Composition In Vitro Ligase Literature Metabolic Metabolism Modeling Molecular Biology Natural Products Organism Pathway interactions Peptides Pharmacologic Substance Pigments Production Property Protein Overexpression Proteins Pseudomonas putida Reporter Soil Source Streptomyces Structure System Therapeutic Transcript Transcriptional Regulation Translational Regulation Translations Type I Polyketide Synthase Work analog base bioactive natural products design emerging antibiotic resistance fighting flaviolin genetic manipulation improved interest novel therapeutics overexpression peptide synthase polyketide synthase premature protein folding protein function protein purification screening small molecule synthetic biology tool

项目摘要

PROJECT SUMMARY/ABSTRACT Bacteria from the order Actinomycetales, especially those from the genus Streptomyces, are some of the most prolific producers of bioactive natural products, including over 75% of commercially available antibiotics. Although other orders of bacteria harbor biosynthetic pathways, the metabolic giftedness of actinomycetes is the gold standard for pharmaceutical discovery. In particular, they harbor many pathways that are modular such as type I polyketide synthases (PKSs) and type I non-ribosomal peptide synthetases (NRPSs), which have been noted for their considerable potential for engineered biosynthesis for well over 30 years. However, actinomycetes present a number of challenges with their growth profiles and genetic systems that serve as less than ideal as heterologous hosts, especially for rapid profiling of engineered systems or for protein production for enzymology studies. Furthermore, their high GC genomes (~75% GC) complicate routine molecular biology, genetic manipulations, and transcriptional and translational efficiency. This is particularly the case with megasynthase enzymes such as PKSs and NRPSs, which are large in size and frequently express poorly, as truncated products, or do not fold correctly. While such issues are discussed in the natural products enzymology community, few systematic studies exist in the literature to understand the functional consequences of heterologous host choice and refactoring, especially at the level at which it affects protein function. Furthermore, many of the systems that would be ideal to profile megasynthases (such as in vitro transcription-translation; TXTL) create irregularities with regard to truncation and folding, which are also poorly characterized. We will examine the functional consequences of host and refactoring-dependent expression on such actinomycetal megasynthases at the protein level. The characterization described in this proposal will lead to a more systematic understanding of the benefits and drawbacks of different systems of heterologous expression for different applications which include characterizing and profiling engineered megasynthases and ultimately producing small molecule metabolites. This work will afford the realization of the full potential of proteins from actinomycetes as a rich source for synthetic biology parts for engineered metabolism.

项目概要/摘要放线菌目细菌，特别是链霉菌属细菌，一些最多产的生物活性天然产品生产商，包括超过 75% 市售抗生素。尽管其他目细菌也具有生物合成能力途径，放线菌的代谢天赋是制药的黄金标准发现。特别是，它们拥有许多模块化途径，例如 I 型聚酮化合物合成酶（PKS）和 I 型非核糖体肽合成酶（NRPS） 30多年来因其在工程生物合成方面的巨大潜力而闻名。然而，放线菌的生长概况和遗传系统提出了许多挑战作为异源宿主，特别是对于工程化的快速分析而言，效果不太理想系统或用于酶学研究的蛋白质生产。此外，它们的高 GC 基因组 (~75% GC) 使常规分子生物学、基因操作以及转录和转录变得复杂翻译效率。对于大合酶（例如 PKS）尤其如此和 NRPS，其尺寸很大并且经常表达不佳，作为截断的产品，或者不折叠不正确。虽然天然产物酶学中讨论了这些问题社区，文献中很少有系统的研究来理解功能异源宿主选择和重构的后果，特别是在它的级别影响蛋白质功能。此外，许多非常适合分析的系统巨合酶（例如体外转录翻译；TXTL）在以下方面产生不规则性截断和折叠，这也很少被表征。我们将检查功能宿主和重构依赖性表达对此类放线菌的影响蛋白质水平的巨合酶。本提案中描述的特征将导致更系统地了解不同系统的优缺点适用于不同应用的异源表达，包括表征和分析设计大合成酶并最终产生小分子代谢物。这项工作将充分发挥放线菌蛋白质作为丰富蛋白质来源的潜力用于工程代谢的合成生物学部件。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Investigating and Optimizing the Lysate-Based Expression of Nonribosomal Peptide Synthetases Using a Reporter System.

DOI：
10.1021/acssynbio.2c00658
发表时间：
2023-04
期刊：
ACS synthetic biology
影响因子：
4.7
作者：
J. L. N. Dinglasan;Tien T. Sword;J. W. Barker;M. Doktycz;Constance B. Bailey
通讯作者：
J. L. N. Dinglasan;Tien T. Sword;J. W. Barker;M. Doktycz;Constance B. Bailey

Expression of blue pigment synthetase a from Streptomyces lavenduale reveals insights on the effects of refactoring biosynthetic megasynthases for heterologous expression in Escherichia coli.