Domain fusion between SNF1-related kinase subunits during plant evolution.
Members of the conserved SNF1/AMP-activated protein kinase (AMPK) family regulate cellular responses to environmental and nutritional stress in eukaryotes. Yeast SNF1 and animal AMPKs form a complex with regulatory SNF4/AMPKgamma and SIP1/SIP2/GAL83/AMPKbeta subunits. The beta-subunits function as target selective adaptors that anchor the catalytic kinase and regulator SNF4/gamma-subunits to their kinase association (KIS) and association with the SNF1 complex (ASC) domains. Here we demonstrate that plant SNF1-related protein kinases (SnRKs) interact with an adaptor-regulator protein, AKINbetagamma, in which an N-terminal KIS domain characteristic of beta-subunits is fused with a C-terminal region related to the SNF4/AMPKgamma proteins. AKINbetagamma is constitutively expressed in plants, suppresses the yeast delta snf4 mutation, and shows glucose-regulated interaction with the Arabidopsis SnRK, AKIN11. Our results suggest that evolution of AKINbetagamma reflects a unique function of SNF1-related protein kinases in plant glucose and stress signalling.
Lumbreras
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Departament de Genètica Molecular, Barcelona, Spain.
Alba
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MM
Kleinow
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Koncz
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C
Pagès
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D055372:AMP-Activated Protein Kinases; D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D002352:Carrier Proteins; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000378:metabolism; D019143:Evolution, Molecular; D017353:Gene Deletion; D005816:Genetic Complementation Test; D005947:Glucose / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D010802:Phylogeny; D010944:Plants / Q000737:chemistry* / Q000235:genetics*; D011485:Protein Binding; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000737:chemistry* / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012333:RNA, Messenger / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D013312:Stress, Physiological; D013696:Temperature; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D020798:Two-Hybrid System Techniques; D003313:Zea mays / Q000737:chemistry / Q000235:genetics
D001426:Bacterial Proteins; D002352:Carrier Proteins; D018076:DNA, Complementary; C068354:Kis protein, Bacteria; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D011494:Protein Kinases; C071570:SNF1-related protein kinases; D017346:Protein Serine-Threonine Kinases; C078651:SNF4 protein, S cerevisiae; D055372:AMP-Activated Protein Kinases; D005947:Glucose