HSP70 from the Antarctic sea urchin Sterechinus neumayeri : molecular characterization and expression in response to heat stress

Biological research: BR

Camila Calfio¹  Luis Mercado²  Marcelo Gonzlez-Aravena³ 

[1] Grupo de Marcadores Inmunolgicos, Laboratorio de Gentica e Inmunologa Molecular, Instituto de Biologa, Pontificia Universidad Catlica de Valparaso, Valparaiso, Chile;IFREMER, CNRS, UMR 5244 IHPEInteractions Htes-Pathognes-Environnements, Universit de Montpellier II, Universit de Perpignan Via Domitia, Montpellier Cedex 5, France;Laboratorio de Biorrecursos Antrticos, Departamento Cientfico, Instituto Antrtico Chileno, Punta Arenas, Chile

关键词: Hsp70;    Coelomocytes;    Antarctica;    Echinoderms;    Climate change;   

DOI  :  10.1186/s40659-018-0156-9

学科分类：生物科学（综合）

来源: BioMed Central

【 摘 要 】

Heat stress proteins are implicated in stabilizing and refolding denatured proteins in vertebrates and invertebrates. Members of the Hsp70 gene family comprise the cognate heat shock protein (Hsc70) and inducible heat shock protein (Hsp70). However, the cDNA sequence and the expression of Hsp70 in the Antarctic sea urchin are unknown. We amplified and cloned a transcript sequence of 1991 bp from the Antarctic sea urchin Sterechinus neumayeri, experimentally exposed to heat stress (5  and 10 °C for 1, 24 and 48 h). RACE-PCR and qPCR were employed to determine Hsp70 gene expression, while western blot and ELISA methods were used to determine protein expression. The sequence obtained from S. neumayeri showed high identity with Hsp70 members. Several Hsp70 family features were identified in the deduced amino acid sequence and they indicate that the isolated Hsp70 is related to the cognate heat shock protein type. The corresponding 70 kDa protein, called Sn-Hsp70, was immune detected in the coelomocytes and the digestive tract of S. neumayeri using a monospecific polyclonal antibody. We showed that S. neumayeri do not respond to acute heat stress by up-regulation of Sn-Hsp70 at transcript and protein level. Furthermore, the Sn-Hsp70 protein expression was not induced in the digestive tract. Our results provide the first molecular evidence that Sn-Hsp70 is expressed constitutively and is non-induced by heat stress in S. neumayeri.

【 授权许可】

CC BY