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Independent Tryptophan pathway in Trichoderma asperellum and T koningiopsis: New insights with bioinformatic and molecular analysis
bioRxiv - Microbiology Pub Date : 2020-07-31 , DOI: 10.1101/2020.07.31.230920
Uribe Bueno Mariana , JL Hernández-Mendoza , García Carlos Armando , Ancona Veronica , Violeta Larios-Serrato

The synthesis of Indole Acetic Acid from tryptophan has been described in plants, fungi and bacteria; it is thus known as tryptophan-dependent indole acetic acid. Four possible pathways of IAA formation have been described, including the indole acetonitrile acid (IAN), indole acetamide (IAM), indole-pyruvic (IAP) and tryptamine (TRM) pathways. Of these, the indole acetonitrile pathway is particularly important because when this compound is transformed into IAA, a nitrogenated molecule is released. The microorganisms that have this pathway are thus called nitrogen fixers. There is another little-studied pathway called TRP-Independent, so-called because the IAA that is formed in it can have an exogenous origin, chorismic acid (CHA), and it enters the pathway through anthranilic acid (ANA). The TRP-Independent pathway is made up of three stages. The first from CHA to ANA, the second from AA to IAA and the third from TRP to ANA through Kynurenine (KYN). This work describes the different stages of the pathway, as well as the enzymes and the genes that control the production of IAA, using a bioinformatic analysis of the genes involved, which were identified by PCR. An expression analysis showed that only T asperellum has the necessary genes to incorporate ANA into the TRP-I pathway and synthesize IAA through it. The analysis also detected the gene that regulates anthranilate phosphoribosyl transferase (AFT), an enzyme necessary for the synthesis of AIA from ANA; the presence of this gene was confirmed in the two species analyzed.

中文翻译:

曲霉木霉菌和康宁木霉菌中的独立色氨酸途径:生物信息学和分子分析的新见解

从色氨酸合成吲哚乙酸已在植物,真菌和细菌中进行了描述。因此,它被称为色氨酸依赖性吲哚乙酸。已经描述了IAA形成的四个可能途径,包括吲哚乙腈酸(IAN),吲哚乙酰胺(IAM),吲哚-丙酮酸(IAP)和色胺(TRM)途径。其中,吲哚乙腈途径特别重要,因为当该化合物转化为IAA时,会释放出一个氮化分子。具有这种途径的微生物因此被称为固氮剂。还有另一种尚未研究的途径,称为独立于TRP,之所以这样称呼,是因为其中形成的IAA可能具有外源血尿酸(CHA),并通过邻氨基苯甲酸(ANA)进入该途径。不依赖TRP的途径由三个阶段组成。第一个从CHA到ANA,第二个从AA到IAA,第三个从TRP到Kynurenine(KYN)到ANA。这项工作通过对涉及基因的生物信息学分析(通过PCR鉴定),描述了该途径的不同阶段,以及控制IAA产生的酶和基因。表达分析表明,只有曲霉T才具有将ANA整合到TRP-1途径并通过该途径合成IAA的必要基因。分析还检测到了调节邻氨基苯甲酸磷酸核糖基转移酶(AFT)的基因,该酶是由ANA合成AIA所必需的酶。在分析的两个物种中证实了该基因的存在。通过对涉及基因的生物信息学分析(通过PCR鉴定),以及控制IAA产生的酶和基因。表达分析表明,只有曲霉T才具有将ANA整合到TRP-1途径并通过该途径合成IAA的必要基因。分析还检测到了调节邻氨基苯甲酸磷酸核糖基转移酶(AFT)的基因,该酶是由ANA合成AIA所必需的酶。在分析的两个物种中证实了该基因的存在。通过对涉及基因的生物信息学分析(通过PCR鉴定),以及控制IAA产生的酶和基因。表达分析表明,只有曲霉T才具有将ANA整合到TRP-1途径并通过该途径合成IAA的必要基因。分析还检测到了调节邻氨基苯甲酸磷酸核糖基转移酶(AFT)的基因,该酶是由ANA合成AIA所必需的酶。在分析的两个物种中证实了该基因的存在。分析还检测到了调节邻氨基苯甲酸磷酸核糖基转移酶(AFT)的基因,该酶是由ANA合成AIA所必需的酶。在分析的两个物种中证实了该基因的存在。分析还检测到了调节邻氨基苯甲酸磷酸核糖基转移酶(AFT)的基因,该酶是由ANA合成AIA所必需的酶。在分析的两个物种中证实了该基因的存在。
更新日期:2020-08-01
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