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基因在 spp. 中是保守的，能够对同一宿主植物结瘤，并对根分泌物作出表达。

Gene Is Conserved across spp. Able to Nodulate the Same Host Plant and Expressed in Response to Root Exudates.

机构信息

Laboratório de Microbiologia do Solo, Instituto de Ciências Agrárias e Ambientais Mediterrânicas (ICAAM), Instituto de Investigação e Formação Avançada (IIFA), Universidade de Évora, Apartado 94, 7002-554 Évora, Portugal.

出版信息

Biomed Res Int. 2019 Jan 30;2019:3715271. doi: 10.1155/2019/3715271. eCollection 2019.

DOI:10.1155/2019/3715271
PMID:30834262
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6374801/
Abstract

Evidences for an involvement of the bacterial type IV secretion system (T4SS) in the symbiotic relationship between rhizobia and legumes have been pointed out by several recent studies. However, information regarding this secretion system in is still very scarce. The aim of the present study was to investigate the phylogeny and expression of the gene, which encodes a substrate receptor of the T4SS. In addition, the occurrence and genomic context of this and other T4SS genes, namely, genes from and complexes, were also analyzed in order to unveil the structural and functional organization of T4SS in mesorhizobia. The location of the T4SS genes in the symbiotic region of the analyzed rhizobial genomes, along with the phylogeny, suggests that T4SS genes could be horizontally transferred together with the symbiosis genes. Regarding the T4SS structural organization in , the genes were absent in all chickpea ( L.) microsymbionts and in the symbiont MAFF303099. Interestingly, the presence of genes belonging to another secretion system (T3SS) was restricted to these strains lacking the genes. The gene expression was detected in Ca36 and LMS-1 strains when exposed to chickpea root exudates and also in the early nodules formed by Ca36, but not in older nodules. This study contributes to a better understanding of the importance of T4SS in mutualistic symbiotic bacteria.

摘要

有几项最近的研究指出，细菌 IV 型分泌系统（T4SS）参与了根瘤菌和豆科植物的共生关系。然而，关于 中这种分泌系统的信息仍然非常匮乏。本研究的目的是研究 基因的系统发育和表达，该基因编码 T4SS 的底物受体。此外，还分析了该基因和其他 T4SS 基因（即来自 和 复合物的基因）的发生和基因组结构，以揭示中 T4SS 的结构和功能组织。分析的根瘤菌基因组共生区 T4SS 基因的位置以及 系统发育表明，T4SS 基因可能与共生基因一起水平转移。关于 中 T4SS 的结构组织，所有鹰嘴豆（ ）微共生体和 共生体 MAFF303099 中均缺失 基因。有趣的是，属于另一种分泌系统（T3SS）的基因仅存在于这些缺失 基因的菌株中。当暴露于鹰嘴豆根分泌物时，Ca36 和 LMS-1 菌株中检测到了 基因的表达，并且在 Ca36 形成的早期结瘤中也检测到了该基因的表达，但在较老的结瘤中未检测到。这项研究有助于更好地理解 T4SS 在互利共生细菌中的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/6dd3106b5153/BMRI2019-3715271.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/7896d269a03a/BMRI2019-3715271.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/9efcff6b3bc5/BMRI2019-3715271.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/bbf9f3ca67a3/BMRI2019-3715271.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/9321b8b336b9/BMRI2019-3715271.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/c5f0d12b22e0/BMRI2019-3715271.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/6dd3106b5153/BMRI2019-3715271.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/7896d269a03a/BMRI2019-3715271.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/9efcff6b3bc5/BMRI2019-3715271.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/bbf9f3ca67a3/BMRI2019-3715271.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/9321b8b336b9/BMRI2019-3715271.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/c5f0d12b22e0/BMRI2019-3715271.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9106/6374801/6dd3106b5153/BMRI2019-3715271.006.jpg

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