title: Inositol 1,4,5-trisphosphate receptor type 1 phosphorylation and regulation by extracellular signal-regulated kinase.
abstract: Type 1 inositol 1,4,5-trisphosphate receptor (IP(3)R1) is a widely expressed intracellular calcium-release channel found in many cell types. The operation of IP(3)R1 is regulated through phosphorylation by multiple protein kinases. Extracellular signal-regulated kinase (ERK) has been found involved in calcium signaling in distinct cell types, but the underlying mechanisms remain unclear. Here, we present evidence that ERK1/2 and IP(3)R1 bind together through an ERK binding motif in mouse cerebellum in vivo as well as in vitro. ERK-phosphorylating serines (Ser 436) was identified in mouse IP(3)R1 and Ser 436 phosphorylation had a suppressive effect on IP(3) binding to the recombinant N-terminal 604-amino acid residues (N604). Moreover, phosphorylation of Ser 436 in R(224-604) evidently enhance its interaction with the N-terminal "suppressor" region (N223). At last, our data showed that Ser 436 phosphorylation in IP(3)R1 decreased Ca(2+) releasing through IP(3)R1 channels.
authors.affiliation: Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100080, PR China. baiguirong@yahoo.com
authors.forename: Gui-Rong
authors.initials: GR
authors.lastname: Bai
authors.forename: Ling-Hai
authors.initials: LH
authors.lastname: Yang
authors.forename: Xiu-Ying
authors.initials: XY
authors.lastname: Huang
authors.forename: Fang-Zhen
authors.initials: FZ
authors.lastname: Sun
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism; D015220:Calcium Channels / Q000737:chemistry / Q000378:metabolism*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D053496:Inositol 1,4,5-Trisphosphate Receptors; D051379:Mice; D008861:Microsomes / Q000378:metabolism; D008969:Molecular Sequence Data; D010766:Phosphorylation; D017434:Protein Structure, Tertiary; D018160:Receptors, Cytoplasmic and Nuclear / Q000737:chemistry / Q000378:metabolism*; D012694:Serine / Q000378:metabolism
chemical_list: D015220:Calcium Channels; D053496:Inositol 1,4,5-Trisphosphate Receptors; D018160:Receptors, Cytoplasmic and Nuclear; D012694:Serine; D048049:Extracellular Signal-Regulated MAP Kinases; D002118:Calcium