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Molecular characterization of cold responsive protein AnF48_RPL11 form Antarctic micro green alga AnF48

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Title
Molecular characterization of cold responsive protein AnF48_RPL11 form Antarctic micro green alga AnF48
Other Titles
남극 미세조루 AnF48의 저온 적응 단백질 AnF48_RPL11의 분자적 특성 연구
Authors
Lee, Soo Young
Kim, Min-Jung
Kim, Sanghee
Choi, Han-Gu
Kang, Sung-Ho
Keywords
antarctic; cold stress; ribosomal protein
Issue Date
2010
Citation
Lee, Soo Young, et al. 2010. Molecular characterization of cold responsive protein AnF48_RPL11 form Antarctic micro green alga AnF48. korea polar research institute. korea polar research institute. 2010.05.26~.
Abstract
A polar micro green alga, AnF48 was collected from near the King Sejong Station located in King George Island in the Antarctica (62° 13′S 58° 47′W). It is likely an endemic species, closely related to the genus Hematococcus based on 18S and rbcL sequence data. AnF48 successfully proliferated and propagated near 4-10℃, in contrast it showed dramatic growth decrease (up to 50%) when the ambient temperature exceeded 15℃. To discover the genes which are responsible for this specific temperature adaptation, GeneFishing DEG PCR was performed using cDNAs extracted from AnF48 grown at different temperatures (4℃, 15℃, 25℃). Genes induced by low temperature were identified by cloning and sequencing. One of them was a homolog of RPL11 which has been reported as a cold-responsive gene in E. coli. Thus, we named it AnF48_RPL11 (ribosomal protein L11). RT-PCR analysis confirmed that the expression level of AnF48_RPL11 was significantly up-regulated under 4℃ compared with that at 15℃ or 25℃. The full length cDNA sequences of AnF48_RPL11 was obtained using 5' and 3' race. The open reading frame consisted of 544 bp encoding 125 amino acids. It contains four exons and three introns meanwhile Chlamydomonas reinhardtti has seven exons and six introns. To our surprise, the similarity of deduced amino acids of AnF48_RPL11 is higher with RPL11 in Arabidopsis thaliana (92%) than in algal homologues Chlamydomonas reinhardtii (88%). This results suggested cold adaptative mechanism is conserved in a wide range of organism from E. coli to higher plant. We first report RPL11 from Antarctic micro green alga and provide molecular evidence for evolutionary conservation upon cold stimuli.
URI
http://repository.kopri.re.kr/handle/201206/7978
Conference Name
korea polar research institute
Conference Place
korea polar research institute
Conference Date
2010.05.26~
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