Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.5.1.18 (glutathione S-transferase)
 22,582 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

To identify novel protein phosphatase 1 (PP1)-interacting proteins, a yeast two-hybrid 3T3-L1 adipocyte cDNA library was screened with the catalytic subunit of PP1 as bait. In the present work, the isolation, identification and initial biochemical characterization of a novel PP1-interacting protein, MYPT3, which is homologous with the myosin phosphatase targetting subunit (MYPT) family, is described. MYPT3 aligns >99% with a region of mouse genomic DNA clone RP23-156P23 and localizes to chromosome 15, between markers at 44.1-46.5 cM, as demonstrated by radiation hybrid mapping. The gene consists of ten exons that encode for a 524-amino acid sequence with a predicted molecular mass of 57529 Da. The N-terminal region of MYPT3 consists of a consensus PP1-binding site and multiple ankyrin repeats. MYPT3 is distinguished from related approximately 110-130 kDa MYPT subunits by its molecular mass of 58 kDa, and a unique C-terminal region that contains several potential signalling motifs and a CaaX prenylation site. We have shown that affinity-purified glutathione S-transferase (GST)-MYPT3 is prenylated by purified recombinant farnesyltransferase in vitro. Endogenous PP1 from 3T3-L1 lysates specifically interacts with MYPT3. Additionally, purified PP1 activity was inhibited by GST-MYPT3 toward phosphorylase a, myosin light chain and myosin substrate in vitro. Overall, our findings identify a novel prenylatable subunit of PP1 that defines a new subfamily of MYPT.
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PMID:Cloning and identification of MYPT3: a prenylatable myosin targetting subunit of protein phosphatase 1. 1133 59