title: Phosphorylation of neurofibromin by cAMP-dependent protein kinase is regulated via a cellular association of N(G),N(G)-dimethylarginine dimethylaminohydrolase.
abstract: The neurofibromatosis type 1 (NF1) tumor suppressor (neurofibromin) is thought to play crucial roles in cellular Ras- and cAMP-dependent kinase (PKA)-associated signals. In this study, we identified a cellular neurofibromin-associating protein, N(G),N(G)-dimethylarginine dimethylaminohydrolase (DDAH) that is known as a cellular NO/NOS regulator. The interaction of DDAH was mainly directed to the C-terminal domain (CTD) and to the cysteine/serine-rich domain (CSRD) of neurofibromin, coinciding with the regions containing specific PKA phosphorylation sites. DDAH increased PKA phosphorylation of native neurofibromin in a dose-dependent manner, especially affecting the phosphorylation of CSRD. These findings suggest that the PKA accessibility of neurofibromin was regulated via DDAH interaction, and this regulation may modulate the cellular function of neurofibromin that is implicated in NF1-related pathogenesis.
authors: Department of Tumor Genetics and Biology, Kumamoto University School of Medicine, Japan.
authors: H
authors: H
authors: Tokuo
authors: S
authors: S
authors: Yunoue
authors: L
authors: L
authors: Feng
authors: M
authors: M
authors: Kimoto
authors: H
authors: H
authors: Tsuji
authors: T
authors: T
authors: Ono
authors: H
authors: H
authors: Saya
authors: N
authors: N
authors: Araki
mesh_terms: D000581:Amidohydrolases; D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism*; D006867:Hydrolases / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D025542:Neurofibromin 1; D010766:Phosphorylation; D051381:Rats; D011916:Rats, Inbred F344; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D009419:Nerve Tissue Proteins; D025542:Neurofibromin 1; D011993:Recombinant Fusion Proteins; D017868:Cyclic AMP-Dependent Protein Kinases; D006867:Hydrolases; D000581:Amidohydrolases; C059999:dimethylargininase