title: Distinct spatiotemporal expression of EFA6D, a guanine nucleotide exchange factor for ARF6, among the EFA6 family in mouse brain.
abstract: The EFA6 family is a member of guanine nucleotide exchange factors (GEFs) that can activate ARF6 specifically in vitro. In this study, we determined the complete primary sequence of mouse EFA6D encoding a protein of 1004 amino acids with a calculated molecular weight of 111,207 Da. In ARF pull-down assay, EFA6D showed a preferential GEF activity toward ARF6. RT-PCR analysis revealed the widespread tissue distribution of EFA6D and the high expression of EFA6A, C and D in the brain. In situ hybridization analysis demonstrated a distinct spatiotemporal expression pattern of EFA6D from those of EFA6A and C in mouse brain. Furthermore, immunoblot analysis revealed that EFA6D was highly concentrated in the postsynaptic density fraction. These findings suggest differential spatiotemporal regulation of ARF6 by three members of the EFA6 family in the brain.
authors.affiliation: Division of Histology, Department of Cell Biology, Graduate School of Medicine, Tohoku University, Sendai 980-8574, Japan. hsakagam@mail.tains.tohoku.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sakagami
authors.forename: Hiroharu
authors.initials: H
authors.lastname: Suzuki
authors.forename: Akifumi
authors.initials: A
authors.lastname: Kamata
authors.forename: Yuji
authors.initials: Y
authors.lastname: Owada
authors.forename: Kohji
authors.initials: K
authors.lastname: Fukunaga
authors.forename: Hideaki
authors.initials: H
authors.lastname: Mayanagi
authors.forename: Hisatake
authors.initials: H
authors.lastname: Kondo
mesh_terms: D000089982:ADP-Ribosylation Factor 6; D020727:ADP-Ribosylation Factors / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000378:metabolism*; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics*; D015151:Immunoblotting; D017403:In Situ Hybridization; D051379:Mice; D008969:Molecular Sequence Data; D020033:Protein Isoforms / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid
chemical_list: D000089982:ADP-Ribosylation Factor 6; D020662:Guanine Nucleotide Exchange Factors; D020033:Protein Isoforms; C504474:Psd protein, mouse; D012333:RNA, Messenger; D020727:ADP-Ribosylation Factors; C000715727:Arf6 protein, mouse; C000715349:Arf6 protein, rat