An Arabidopsis homologue of human seven-in-absentia-interacting protein is involved in pathogen resistance.
Human seven-in-absentia (SIAH)-interacting protein (SIP) is a component of the E3 ligase complex targeting beta-catenin for destruction. Arabidopsis has one SIP protein (AtSIP) with 32% amino acid sequence identity to SIP. To investigate the functions of AtSIP, we isolated an atsip knockout mutant, and generated transgenic plants overexpressing AtSIP. The growth rates and morphologies of the atsip and transgenic plants were indistinguishable from those of wild type. However, atsip plants were more susceptible to Pseudomonas syringae infection, and the transgenic plants overexpressing AtSIP were more resistant. Consistent with this, RNA blot analysis showed that the AtSIP gene is strongly induced by wounding and hydrogen peroxide treatment. In addition, when plants were infected with P. syringae, AtSIP was transiently induced prior to PR-1 induction. These observations show that Arabidopsis AtSIP plays a role in resistance to pathogenic infection.
Kim
Youn-Sung
YS
Molecular Signaling Laboratory, Department of Chemistry, Seoul National University, Seoul 151-742, Korea. yskim907@snu.ac.kr
Ham
Byung-Kook
BK
Paek
Kyung-Hee
KH
Park
Chung-Mo
CM
Chua
Nam-Hai
NH
D017360:Arabidopsis / Q000235:genetics / Q000382:microbiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D018506:Gene Expression Regulation, Plant; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007113:Immunity, Innate / Q000235:genetics*; D009154:Mutation; D016877:Oxidants / Q000494:pharmacology; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D018515:Plant Leaves / Q000382:microbiology; D030821:Plants, Genetically Modified / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D044224:Pseudomonas syringae / Q000254:growth & development* / Q000472:pathogenicity; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D014774:Virulence; D014947:Wounds and Injuries / Q000382:microbiology
D029681:Arabidopsis Proteins; D016877:Oxidants; D018749:RNA, Plant; D006861:Hydrogen Peroxide