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E scherichia coli cold‐shock gene profiles in response to over‐expression/deletion of C sd A , RN ase R and PNP ase
and relevance to low‐temperature RNA metabolism
Author(s) -
Phadtare Sangita
Publication year - 2012
Publication title -
genes to cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 115
eISSN - 1365-2443
pISSN - 1356-9597
DOI - 10.1111/gtc.12002
Subject(s) - cold shock domain , rnase p , biology , rna , rna binding protein , gene expression , biochemistry , exoribonuclease , microbiology and biotechnology , polynucleotide phosphorylase , gene , purine nucleoside phosphorylase , enzyme , purine
Cold‐shock response is elicited by the transfer of exponentially growing cells from their optimum temperature to a significantly lower growth temperature and is characterized by the induction of several cold‐shock proteins. These proteins, which presumably possess a variety of different activities, are critical for survival and continued growth at low temperature. One of the main consequences of cold shock is stabilization of the secondary structures in nucleic acids leading to hindrance of RNA degradation. Cold‐shock proteins, such as RNA helicase C sd A , and 3′‐5′ processing exoribonucleases, such as PNP ase and RN ase R , are presumably involved in facilitating the RNA metabolism at low temperature. As a step toward elucidating the individual contributions of these proteins to low‐temperature RNA metabolism, the global transcript profiles of cells lacking C sd A , RN ase R and PNP ase proteins as well as cells individually over‐expressing these proteins as compared to the wild‐type cells were analyzed at 15 °C. The analysis showed distinct sets of genes, which are possible targets of each of these proteins. This analysis will help further our understanding of the low‐temperature RNA metabolism.