HSP70 from the Antarctic sea urchin Sterechinus neumayeri: molecular characterization and expression in response to heat stress
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Sociedad de Biología de Chile
Abstract
Background: 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.
Methods: 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.
Results: 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.
Conclusions: Our results provide the first molecular evidence that Sn-Hsp70 is expressed constitutively and is noninduced
by heat stress in S. neumayeri.
Description
Keywords
Ciencia, Climate change, Echinoderms, Coelomocytes
Citation
Biol Res (2018) 51:8