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Systematic name YAL056W
Gene name GPB2
Aliases KRH1
Feature type ORF, Verified
Coordinates Chr I:39259..41901
Primary SGDID S000000052

Description of YAL056W: Multistep regulator of cAMP-PKA signaling; inhibits PKA downstream of Gpa2p and Cyr1p, thereby increasing cAMP dependency; inhibits Ras activity through direct interactions with Ira1p/2p; regulated by G-alpha protein Gpa2p; GPB2 has a paralog, GPB1, that arose from the whole genome duplication[1][2][3][4][5][6][7]


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  1. Batlle M, et al. (2003) Krh1p and Krh2p act downstream of the Gpa2p G(alpha) subunit to negatively regulate haploid invasive growth. J Cell Sci 116(Pt 4):701-10 SGD PMID 12538771
  2. Byrne KP and Wolfe KH (2005) The Yeast Gene Order Browser: combining curated homology and syntenic context reveals gene fate in polyploid species. Genome Res 15(10):1456-61 SGD PMID 16169922
  3. Harashima T and Heitman J (2002) The Galpha protein Gpa2 controls yeast differentiation by interacting with kelch repeat proteins that mimic Gbeta subunits. Mol Cell 10(1):163-73 SGD PMID 12150916
  4. Harashima T, et al. (2006) The kelch proteins Gpb1 and Gpb2 inhibit Ras activity via association with the yeast RasGAP neurofibromin homologs Ira1 and Ira2. Mol Cell 22(6):819-30 SGD PMID 16793550
  5. Lu A and Hirsch JP (2005) Cyclic AMP-independent regulation of protein kinase A substrate phosphorylation by Kelch repeat proteins. Eukaryot Cell 4(11):1794-800 SGD PMID 16278446
  6. Niranjan T, et al. (2007) Kelch repeat protein interacts with the yeast Galpha subunit Gpa2p at a site that couples receptor binding to guanine nucleotide exchange. J Biol Chem 282(33):24231-8 SGD PMID 17584745
  7. Peeters T, et al. (2006) Kelch-repeat proteins interacting with the Galpha protein Gpa2 bypass adenylate cyclase for direct regulation of protein kinase A in yeast. Proc Natl Acad Sci U S A 103(35):13034-9 SGD PMID 16924114

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