title: Escherichia coli cold-shock gene profiles in response to over-expression/deletion of CsdA, RNase R and PNPase  and relevance to low-temperature RNA metabolism.
abstract: 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 CsdA, and 3'-5' processing exoribonucleases, such as PNPase and RNase 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 CsdA, RNase R and PNPase 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.
authors.affiliation: Department of Biochemistry, Robert Wood Johnson Medical School, UMDNJ, CABM, 679 Hoes Lane, Piscataway, NJ 08854, USA. phadtasa@umdnj.edu
authors.forename: Sangita
authors.initials: S
authors.lastname: Phadtare
mesh_terms: D057773:Cold Shock Proteins and Peptides / Q000235:genetics*; D058639:Cold-Shock Response / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000235:genetics* / Q000378:metabolism; D005095:Exoribonucleases / Q000235:genetics; D017353:Gene Deletion; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D009154:Mutation; D020365:RNA Helicases / Q000235:genetics; D012329:RNA, Bacterial / Q000378:metabolism*
chemical_list: D057773:Cold Shock Proteins and Peptides; D029968:Escherichia coli Proteins; D012329:RNA, Bacterial; C489683:rnr protein, E coli; D005095:Exoribonucleases; D020365:RNA Helicases