Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform is an enzyme that in humans is encoded by the PPP2R1Agene. In the plant Arabidopsis thaliana a similar enzyme is encoded by the RCN1 gene (At1g25490).
This gene encodes a constant regulatory subunit of protein phosphatase 2. Protein phosphatase 2 is one of the four major Ser/Thr phosphatases, and it is implicated in the negative control of cell growth and division. It consists of a common heteromeric core enzyme, which is composed of a catalytic subunit and a constant regulatory subunit, that associates with a variety of regulatory subunits. The constant regulatory subunit A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. This gene encodes an alpha isoform of the constant regulatory subunit A.
RCN1 At1g25490 is one of three genes in Arabidopsis encoding Phosphoprotein Phosphatase 2A Regulatory Subunit A (PP2Aa). The association of different b subunits with a PP2Aa-PP2ac dimer is believed to determine substrate specificity.
^Everett AD, Xue C, Stoops T (August 1999). "Developmental expression of protein phosphatase 2A in the kidney". J. Am. Soc. Nephrol. 10 (8): 1737–45. PMID10446941.
^Haynes JG, Hartung AJ, Hendershot JD, Passingham RS, Rundle SJ (February 1999). "Molecular characterization of the B' regulatory subunit gene family of Arabidopsis protein phosphatase 2A". Eur. J. Biochem. 260 (1): 127–136. doi:10.1046/j.1432-1327.1999.00154.x. PMID10091592.
Hemmings BA, Adams-Pearson C, Maurer F, et al. (1990). "alpha- and beta-forms of the 65-kDa subunit of protein phosphatase 2A have a similar 39 amino acid repeating structure". Biochemistry. 29 (13): 3166–3173. doi:10.1021/bi00465a002. PMID2159327.
Tung HY, De Rocquigny H, Zhao LJ, et al. (1997). "Direct activation of protein phosphatase-2A0 by HIV-1 encoded protein complex NCp7:vpr". FEBS Lett. 401 (2–3): 197–201. doi:10.1016/S0014-5793(96)01470-6. PMID9013886.
Ruediger R, Brewis N, Ohst K, Walter G (1998). "Increasing the ratio of PP2A core enzyme to holoenzyme inhibits Tat-stimulated HIV-1 transcription and virus production". Virology. 238 (2): 432–443. doi:10.1006/viro.1997.8873. PMID9400615.
Groves MR, Hanlon N, Turowski P, et al. (1999). "The structure of the protein phosphatase 2A PR65/A subunit reveals the conformation of its 15 tandemly repeated HEAT motifs". Cell. 96 (1): 99–110. doi:10.1016/S0092-8674(00)80963-0. PMID9989501.
Lubert EJ, Hong Y, Sarge KD (2001). "Interaction between protein phosphatase 5 and the A subunit of protein phosphatase 2A: evidence for a heterotrimeric form of protein phosphatase 5". J. Biol. Chem. 276 (42): 38582–38587. doi:10.1074/jbc.M106906200. PMID11504734.
Elder RT, Yu M, Chen M, et al. (2001). "HIV-1 Vpr induces cell cycle G2 arrest in fission yeast (Schizosaccharomyces pombe) through a pathway involving regulatory and catalytic subunits of PP2A and acting on both Wee1 and Cdc25". Virology. 287 (2): 359–370. doi:10.1006/viro.2001.1007. PMID11531413.