NDLI: ArHsp40, a type 1 J-domain protein, is developmentally regulated and stress inducible in post-diapause Artemia franciscana

Content Provider	Springer Nature Link
Author	Jiang, Guojian Rowarth, Nathan M. Panchakshari, Sheethal MacRae, Thomas H.
Copyright Year	2016
Abstract	Upon diapause termination and exposure to favorable environmental conditions, cysts of the crustacean Artemia franciscana reinitiate development, a process dependent on the resumption of metabolic activity and the maintenance of protein homeostasis. The objective of the work described herein was to characterize molecular chaperones during post-diapause growth of A. franciscana. An Hsp40 complementary DNA (cDNA) termed ArHsp40 was cloned and shown to encode a protein with an amino-terminal J-domain containing a conserved histidine, proline, and aspartic acid (HPD) motif. Following the J-domain was a Gly/Phe (G/F) rich domain, a zinc-binding domain which contained a modified CXXCXGXG motif, and the carboxyl-terminal substrate binding region, all characteristics of type I Hsp40. Multiple alignment and protein modeling showed that ArHsp40 is comparable to Hsp40s from other eukaryotes and likely to be functionally similar. qRT-PCR revealed that during post-diapause development, ArHsp40 messenger RNA (mRNA) varied slightly until the E2/E3 stage and decreased significantly upon hatching. The immunoprobing of Western blots demonstrated that ArHsp40 was also relatively constant until E2/E3 and then declined dramatically. The drop in ArHsp40 when metabolism and protein synthesis were increasing was unexpected and demonstrated developmental regulation. The reduction in ArHsp40 at such an active life history stage indicates, as one possibility, that A. franciscana possesses additional Hsp40s, one or more of which replaces ArHsp40 as development progresses. Increased synthesis upon heat shock established that in addition to being developmentally regulated, ArHsp40 is stress inducible and, because it is found in mature cysts, ArHsp40 has the potential to contribute to stress tolerance during diapause.
Starting Page	1077
Ending Page	1088
Page Count	12
File Format	PDF
ISSN	13558145
Journal	Cell Stress and Chaperones
Volume Number	21
Issue Number	6
e-ISSN	14661268
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-08-31
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Molecular chaperone Hsp40 J-domain Post-diapause development Stress Crustacean Artemia franciscana Biomedicine Cell Biology Biochemistry Immunology Cancer Research Neurosciences
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry

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