title: Targeting of the Arf-like GTPase Arl3p to the Golgi requires N-terminal acetylation and the membrane protein Sys1p.
abstract: The GTPase Arl3p is required to recruit a second GTPase, Arl1p, to the Golgi in Saccharomyces cerevisiae. Arl1p binds to the GRIP domain, which is present in a number of long coiled-coil proteins or 'golgins'. Here we show that Arl3p is not myristoylated like most members of the Arf family, but is instead amino-terminally acetylated by the NatC complex. Targeting of Arl3p also requires a Golgi membrane protein Sys1p. The human homologues of Arl3p (Arf-related protein 1 (ARFRP1)) and Sys1p (hSys1) can be isolated in a complex after chemical cross-linking. This suggests that the targeting of ARFRP1/Arl3p to the Golgi is mediated by a direct interaction between its acetylated N terminus and Sys1p/hSys1.
authors.affiliation: MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.
authors.forename: Rudy
authors.initials: R
authors.lastname: Behnia
authors.forename: Bojana
authors.initials: B
authors.lastname: Panic
authors.forename: James R C
authors.initials: JR
authors.lastname: Whyte
authors.forename: Sean
authors.initials: S
authors.lastname: Munro
mesh_terms: D020823:ADP-Ribosylation Factor 1 / Q000235:genetics / Q000378:metabolism; D020727:ADP-Ribosylation Factors / Q000235:genetics / Q000378:metabolism*; D000107:Acetylation; D000123:Acetyltransferases / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D001191:Arylamine N-Acetyltransferase / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism; D006056:Golgi Apparatus / Q000378:metabolism*; D006801:Humans; D046911:Macromolecular Substances; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D020559:Monomeric GTP-Binding Proteins; D017434:Protein Structure, Tertiary; D021381:Protein Transport / Q000502:physiology; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D033921:Vesicular Transport Proteins
chemical_list: D002352:Carrier Proteins; C117417:IMH1 protein, S cerevisiae; D046911:Macromolecular Substances; D008565:Membrane Proteins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; C444081:Sys1 protein, S cerevisiae; D033921:Vesicular Transport Proteins; D000123:Acetyltransferases; C077299:MAK3 protein, S cerevisiae; D001191:Arylamine N-Acetyltransferase; C097313:ADP-ribosylation factor related proteins; C487039:ARL1 protein, S cerevisiae; D020823:ADP-Ribosylation Factor 1; D020727:ADP-Ribosylation Factors; C490249:ARL3 protein, S cerevisiae; C490247:ARL3 protein, human; D020559:Monomeric GTP-Binding Proteins