TY  - JOUR
A1  - Maier, Lisa-Katharina
A1  - Benz, Juliane
A1  - Fischer, Susan
A1  - Alstetter, Martina
A1  - Jaschinski, Katharina
A1  - Hilker, Rolf
A1  - Becker, Anke
A1  - Allers, Thorsten
A1  - Soppa, Jörg
A1  - Marchfelder, Anita
T1  - Deletion of the Sm1 encoding motif in the lsm gene results in distinct changes in the transcriptome and enhanced swarming activity of Haloferax cells
T2  - Biochimie
N2  - Members of the Sm protein family are important for the cellular RNA metabolism in all three domains of life. The family includes archaeal and eukaryotic Lsm proteins, eukaryotic Sm proteins and archaeal and bacterial Hfq proteins. While several studies concerning the bacterial and eukaryotic family members have been published, little is known about the archaeal Lsm proteins. Although structures for several archaeal Lsm proteins have been solved already more than ten years ago, we still do not know much about their biological function, however one can confidently propose that the archaeal Lsm proteins will also be involved in RNA metabolism. Therefore, we investigated this protein in the halophilic archaeon Haloferax volcanii. The Haloferax genome encodes a single Lsm protein, the lsm gene overlaps and is co-transcribed with the gene for the ribosomal L37.eR protein. Here, we show that the reading frame of the lsm gene contains a promoter which regulates expression of the overlapping rpl37R gene. This rpl37R specific promoter ensures high expression of the rpl37R gene in exponential growth phase. To investigate the biological function of the Lsm protein we generated a lsm deletion mutant that had the coding sequence for the Sm1 motif removed but still contained the internal promoter for the downstream rpl37R gene. The transcriptome of this deletion mutant was compared to the wild type transcriptome, revealing that several genes are down-regulated and many genes are up-regulated in the deletion strain. Northern blot analyses confirmed down-regulation of two genes. In addition, the deletion strain showed a gain of function in swarming, in congruence with the up-regulation of transcripts encoding proteins required for motility.
KW  - Lsm
KW  - Hfq
KW  - Haloferax volcanii
KW  - Archaea
KW  - L37.eR
Y1  - 2015
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/50596
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-505963
SN  - 0300-9084
N1  - © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
VL  - 117
SP  - 129
EP  - 137
PB  - Elsevier
CY  - Paris [u. a.]
ER  -