Osmotin is a homolog of mammalian adiponectin and controls apoptosis in yeast through a homolog of mammalian adiponectin receptor.
The antifungal activity of the PR-5 family of plant defense proteins has been suspected to involve specific plasma membrane component(s) of the fungal target. Osmotin is a tobacco PR-5 family protein that induces apoptosis in the yeast Saccharomyces cerevisiae. We show here that the protein encoded by ORE20/PHO36 (YOL002c), a seven transmembrane domain receptor-like polypeptide that regulates lipid and phosphate metabolism, is an osmotin binding plasma membrane protein that is required for full sensitivity to osmotin. PHO36 functions upstream of RAS2 in the osmotin-induced apoptotic pathway. The mammalian homolog of PHO36 is a receptor for the hormone adiponectin and regulates cellular lipid and sugar metabolism. Osmotin and adiponectin, the corresponding "receptor" binding proteins, do not share sequence similarity. However, the beta barrel domain of both proteins can be overlapped, and osmotin, like adiponectin, activates AMP kinase in C2C12 myocytes via adiponectin receptors.
Narasimhan
Meena L
ML
Center for Plant Environmental Stress Physiology, Purdue University, 625 Agriculture Mall Drive, West Lafayette, Indiana [corrected] 47907, USA.
Coca
María A
MA
Jin
Jingbo
J
Yamauchi
Toshimasa
T
Ito
Yusuke
Y
Kadowaki
Takashi
T
Kim
Kyeong Kyu
KK
Pardo
José M
JM
Damsz
Barbara
B
Hasegawa
Paul M
PM
Yun
Dae-Jin
DJ
Bressan
Ray A
RA
D052242:Adiponectin; D000595:Amino Acid Sequence; D000818:Animals; D000935:Antifungal Agents / Q000378:metabolism; D017209:Apoptosis; D001483:Base Sequence; D036341:Intercellular Signaling Peptides and Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010641:Phenotype; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D018631:ras Proteins / Q000378:metabolism
D052242:Adiponectin; D000935:Antifungal Agents; C497767:IZH2 protein, S cerevisiae; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D010940:Plant Proteins; D020033:Protein Isoforms; D034741:RNA, Small Interfering; D029701:Saccharomyces cerevisiae Proteins; C489015:RAS2 protein, S cerevisiae; D018631:ras Proteins