Journal of Microbiology

Review

Role of Rab GTPases in Bacteria Escaping from Vesicle Trafficking of Host Cells.: Huiling Xu, Shengnan Wang, Xiaozhou Wang, Pu Zhang, Qi Zheng, ChangXi Qi, Xiaoting Liu, Muzi Li, Yongxia Liu, Jianzhu Liu; J. Microbiol. 2024;62(8):581-590. Published online August 30, 2024; DOI: https://doi.org/10.1007/s12275-024-00162-9

Abstract: Most bacteria will use their toxins to interact with the host cell, causing damage to the cell and then escaping from it. When bacteria enter the cell, they will be transported via the endosomal pathway. Rab GTPases are involved in bacterial transport as major components of endosomes that bind to their downstream effector proteins. The bacteria manipulate some Rab GTPases, escape the cell, and get to survive. In this review, we will focus on summarizing the many processes of how bacteria manipulate Rab GTPases to control their escape.

Research Support, Non-U.S. Gov't

The effect of the cwf14 gene of fission yeast on cell wall integrity is associated with rho1: Dong-Uk Kim , Shinae Maeng , Hyemi Lee , Miyoung Nam , Sook-Jeong Lee , Kwang-Lae Hoe; J. Microbiol. 2016;54(2):98-105. Published online February 2, 2016; DOI: https://doi.org/10.1007/s12275-016-5569-y

Abstract: In all eukaryotic organisms, a wide range of morphologies are responsible for critical cellular function and development. In particular, the Rho GTPases, which are highly conserved from yeast to mammals, are key molecules in signaling pathways that control cell polarity processes and cell wall biosynthesis, which are fundamental aspects of morphogenesis. Therefore, using haploinsufficiency deletion mutants of the fission yeast Schizosaccharomyces pombe, we screened the slow-growing mutants and their morphogenesis, specifically focusing on regulation of their Rho GTPases. Based on this screening, we found that the cwf14 mutant of S. pombe exhibited the slow growth and abnormal phenotypes with an elongated cell shape and thicker cell wall when compared with wild-type cells. In particular, cells with the cwf14 deletion showed excessive Rho1 expression. However, the wildtype strain with ectopically expressed Rho1 did not exhibited any significant change in the level of cwf14, suggesting that cwf14 may act on the upstream of Rho1. Furthermore, the cells with a cwf14 deletion also have increased sensitivity to β-glucanase, a cell wall-digesting enzyme, which is also seen in Rho1-overexpressing cells. Overall, our results suggest that the cwf14 plays a key role in fission yeast morphogenesis and cell wall biosynthesis and/or degradation possibly via the regulation of Rho1 expression.

Effects of Thiamine Pyrophosphate on the Inhibition of Self-splicing of Primary Transcripts of T4 phage Thymidylate Synthase Gene in the Presence of GTP: Hyun Joo Lee , Sung Joon Ahn , Sook Shin , In Kook Park; J. Microbiol. 2002;40(2):134-139.

Abstract: Effects of GTP on the inhibition of self-splicing of primary transcripts of the phage T4 thymidylate synthase gene (td) by thiamine pyrophosphate and its analogs have been investigated. The order of the inhibitory efficiency for compounds tested was as follows: thiamine pyrophosphate > thiamine mono-phosphate > thiamine. Of all compounds examined, thiamine pyrophosphate was the most potent inhibitor. Increasing GTP concentration in splicing reaction tended to overcome the suppressive effects of self-splicing by thiamine pyrophosphate and its analogs. The inhibition by thiamine pyrophosphate was most sensitized to a higher concentration of GTP. It has been speculated that the key structural features in thiamine pyrophosphate and its analogs responsible for the inhibition of splicing may be a thiamine moiety in which the phosphorylation of 2-hydroxylethyl group on 5-position of thiazolium ring rendered further stimulation of inhibition in self-splicing reaction.

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