Journal
JOURNAL OF MOLECULAR BIOLOGY
Volume 390, Issue 4, Pages 604-617Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2009.05.035
Keywords
sti-1; Sti1/Hop; aging; heat stress; C. elegans
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Funding
- World Class University program through the Korea Science and Engineering Foundation
- Ministry of Education, Science, and Technology [R33-2008-000-10026-0]
- National Research Foundation of Korea [과06A1202, 핵09A3112, R33-2008-000-10026-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Environmental and physiological stresses such as heat shock, oxidative stress, heavy metals, and pathogenic conditions induce cellular stress response. This response is often mediated by heat shock proteins that function as molecular chaperones. A stress-inducible cochaperone, Stil/Hop (Hsp organizer protein), functions as an adaptor protein that simultaneously binds with Hsp70 and Hsp90 to transfer client proteins from Hsp70 to Hsp90. However, the biological role of STI-1 in vivo is poorly understood in metazoans. Here, we report the characterization of the Caenorhabditis elegans homolog of Stil/Hop, which is approximately 56% identical with human STI-1. C. elegans STI-1 (CeSTI-1) is expressed in the pharynx, intestine, nervous system, and muscle from larvae to adults. Analysis of proteins immunoprecipitated with anti-STI-1 antibody by mass spectrometry revealed that CeSTI-1 can bind with both Hsp70 and Hsp,90 homologs like its mammalian counterpart. sti-1 expression is elevated by heat stress, and an sti-1(jh125) null mutant shows decreased fertility under heat stress conditions. These mutants also show abnormally high lethality in extreme heat and may be functioning with DAF-16 in thermotolerance. In addition, sti-1 (jh125) mutants have a shortened life span. Our results confirm that CeSTIA is a cochaperone protein that may maintain homeostatic functions during episodes of stress and can regulate longevity in nematodes. (C) 2009 Elsevier Ltd. All rights reserved.
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