Publication Date:
2002-09-07
Description:
The Golgi-localized, gamma-ear-containing, adenosine diphosphate ribosylation factor-binding proteins (GGAs) are multidomain proteins that bind mannose 6-phosphate receptors (MPRs) in the Golgi and have an essential role in lysosomal enzyme sorting. Here the GGAs and the coat protein adaptor protein-1 (AP-1) were shown to colocalize in clathrin-coated buds of the trans-Golgi networks of mouse L cells and human HeLa cells. Binding studies revealed a direct interaction between the hinge domains of the GGAs and the gamma-ear domain of AP-1. Further, AP-1 contained bound casein kinase-2 that phosphorylated GGA1 and GGA3, thereby causing autoinhibition. This could induce the directed transfer of the MPRs from GGAs to AP-1. MPRs that are defective in binding to GGAs are poorly incorporated into AP-1-containing clathrin-coated vesicles. Thus, the GGAs and AP-1 interact to package MPRs into AP-1-containing coated vesicles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doray, Balraj -- Ghosh, Pradipta -- Griffith, Janice -- Geuze, Hans J -- Kornfeld, Stuart -- R01 CA-08759/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2002 Sep 6;297(5587):1700-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Internal Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12215646" target="_blank"〉PubMed〈/a〉
Keywords:
ADP-Ribosylation Factors/*metabolism
;
Adaptor Proteins, Vesicular Transport
;
Animals
;
Biological Transport
;
Carrier Proteins/*metabolism
;
Cattle
;
Cell Line
;
Clathrin-Coated Vesicles/metabolism
;
HeLa Cells
;
Humans
;
L Cells (Cell Line)
;
Membrane Proteins/*metabolism
;
Mice
;
Mutation
;
Phosphorylation
;
Protein Binding
;
Receptor, IGF Type 2/genetics/*metabolism
;
Recombinant Proteins/metabolism
;
trans-Golgi Network/*metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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