Comparative Genomics of Myxobacterial Chemosensory Systems.

Sharma, G. and Khatri, Indu and Subramanian, Srikrishna (2018) Comparative Genomics of Myxobacterial Chemosensory Systems. Journal of bacteriology, 200 (3). ISSN 1098-5530

Full text not available from this repository. (Request a copy)
Official URL:


Chemosensory systems (CSS) are among the most complex organizations of proteins functioning cooperatively to regulate bacterial motility and other cellular activities. These systems have been studied extensively in bacteria, and usually, they are present as a single system. Eight CSS, the highest number in bacteria, have been reported inDK1622 and are involved in coordinating diverse functions. Here, we have explored and compared the CSS in all available genomes of ordermembers contain 97 to 476 two-component system (TCS) proteins, which assist the bacteria in surviving and adapting to varying environmental conditions. The number of myxobacterial CSS ranges between 1 and 12, with the largest number in familyand the smallest inCheA protein was used as a phylogenetic marker to infer evolutionary relatedness between different CSS, and six novel CSS ("extra CSS" [ECSS]) were thus identified in the myxobacteria besides the previously reported Che1 to Che8 systems fromChe1 to Che8 systems are monophyletic to deltaproteobacteria, whereas the newly identified ECSS form separate clades with different bacterial classes. The comparative modular organization was concordant with the phylogeny. Four clusters lacking CheA proteins were also identified via CheB-based phylogenetic analysis and were categorized as accessory CSS (ACSS). In, an orphan CSS was identified, in which both CheA and CheB were absent. The novel, accessory, and orphan multimodular CSS identified here suggest the emergence of myxobacterial CSS and could assist in further characterizing their roles.This study is focused on chemosensory systems (CSS), which help the bacterium in directing its movement toward or away from chemical gradients. CSS are present as a single system in most of the bacteria except in some groups, including, which has 8 CSS, the highest number reported to date. This is the first comprehensive study carrying out a comparative analysis of the 22 available myxobacterial genomes, which suggests the evolutionary diversity of these systems. We are interested in understanding the distribution of CSS within all known myxobacteria and their probable evolution.

Item Type: Article
Additional Information: Copyright of this article belongs to ASM.
Uncontrolled Keywords: chemotaxis; evolution; modular organization; phylogeny; signal transduction; two-component system
Subjects: Q Science > QR Microbiology
Depositing User: Dr. K.P.S.Sengar
Date Deposited: 27 Mar 2018 04:29
Last Modified: 27 Mar 2018 06:17

Actions (login required)

View Item View Item