The heat shock response of an antarctic alga is evident at 5 degrees C.
A subtidal seaweed collected in antarctic waters, Plocamium cartilagineum (L. Dix.), displayed induction of mRNAs encoding the 70 kDa heat shock protein (HSP70) and the ubiquitin polyprotein (UBI) when incubated at 5 degrees C. Maximal induction of HSP70 mRNA was observed when the alga was incubated at 10 degrees C for 1 h. Incubations at higher temperatures or for longer periods reduced the amount of HSP70 mRNA detected. Incubations at 20 degrees C or greater resulted in cell death. These data indicate that dispite the unusually low temperature of induction, this macrophyte exhibits a heat shock response similar to that of other organisms at temperatures 5 to 10 degrees C above usual growth conditions.
Vayda
M E
ME
Department of Biochemistry, Microbiology and Molecular Biology, University of Maine, Orono 04469-5735.
Yuan
M L
ML
D006360:Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis; D000461:Rhodophyta / Q000235:genetics*; D012624:Seaweed / Q000235:genetics*; D013696:Temperature; D014452:Ubiquitins / Q000378:metabolism
D006360:Heat-Shock Proteins; D012333:RNA, Messenger; D014452:Ubiquitins