Title: Identification of sds22 as an inhibitory subunit of protein phosphatase-1 in rat liver nuclei
Authors: Dinischiotu, A ×
Beullens, Monique
Stalmans, Willy
Bollen, Mathieu #
Issue Date: Feb-1997
Series Title: FEBS Letters vol:402 issue:2-3 pages:141-4
Abstract: sds22 was originally identified in yeast as a regulator of protein phosphatase-1 that is essential for the completion of mitosis. We show here that a structurally related mammalian polypeptide (41.6 kDa) is part of a 260-kDa species of protein phosphatase-1. This holoenzyme, designated PP-1N(sds22), could be immunoprecipitated with sds22 antibodies and was retained by microcystin-Sepharose. PP-1N(sds22) is a latent phosphatase, but its activity could be revealed by the proteolytic destruction of the noncatalytic subunit(s). PP-1N(sds22) accounted for only 5-10% of the total activity of PP-1 in rat liver nuclear extracts. A synthetic 22-mer peptide, corresponding to a leucine-rich repeat of sds22, specifically inhibited the catalytic subunit of PP-1, showing that at least part of the latency stems from the interaction of the sds22 repeat(s) with PP-1C.
ISSN: 0014-5793
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry Section (Medicine) (-)
Department of Cellular and Molecular Medicine - miscellaneous
Laboratory of Biosignaling & Therapeutics
× corresponding author
# (joint) last author

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