title: Cloning of heat shock protein genes (hsp90 and hsc70) and their expression during larval diapause and cold tolerance acquisition in the rice stem borer, Chilo suppressalis Walker.
abstract: The complete cDNA sequences of heat shock protein 90 (hsp90) and of heat shock cognate protein 70 (hsc70) were cloned by reverse transcription polymerase chain reaction from the rice stem borer, Chilo suppressalis Walker. They potentially encode a 717-amino-acids (hsp90) and a 652-amino-acids (hsc70) protein, with calculated molecular weight of 82.5 and 71.3 kDa, respectively. The deduced amino acid sequence of hsp90 showed the highest homology of 97.2% to Spodoptera frugiperda hsp90. The closest match of C. suppressalis hsc70 was with Manduca sexta hsc70 at 98.0% identity. Expression of hsp90 in diapausing larvae was higher than that in non-diapausing larvae. No such up-regulation in diapausing larvae was observed for hsc70. In non-diapausing larvae, but not in diapausing ones, hsp90 expression was up-regulated by cold acclimation. Hsc70 expression slightly decreased during cold acclimation irrespective of the state of diapause. Involvement of hsp90 and hsc70 in larval diapause and cold tolerance acquisition in C. suppressalis is discussed.
authors.affiliation: Research Institute for Bioresources, Okayama University; Kurashiki, Okayama, Japan. sonodas@rib.okayama-u.ac.jp
authors.forename: Shoji
authors.initials: S
authors.lastname: Sonoda
authors.forename: Katsue
authors.initials: K
authors.lastname: Fukumoto
authors.forename: Yohei
authors.initials: Y
authors.lastname: Izumi
authors.forename: Hideya
authors.initials: H
authors.lastname: Yoshida
authors.forename: Hisaaki
authors.initials: H
authors.lastname: Tsumuki
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D003080:Cold Temperature; D004587:Electrophoresis, Agar Gel; D005260:Female; D050883:HSC70 Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D018841:HSP90 Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D007915:Lepidoptera / Q000235:genetics* / Q000502:physiology; D008969:Molecular Sequence Data; D012313:RNA / Q000737:chemistry / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
chemical_list: D050883:HSC70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D012313:RNA