The fifth adaptor protein complex.

Abstract:

:Adaptor protein (AP) complexes sort cargo into vesicles for transport from one membrane compartment of the cell to another. Four distinct AP complexes have been identified, which are present in most eukaryotes. We report the existence of a fifth AP complex, AP-5. Tagged AP-5 localises to a late endosomal compartment in HeLa cells. AP-5 does not associate with clathrin and is insensitive to brefeldin A. Knocking down AP-5 subunits interferes with the trafficking of the cation-independent mannose 6-phosphate receptor and causes the cell to form swollen endosomal structures with emanating tubules. AP-5 subunits can be found in all five eukaryotic supergroups, but they have been co-ordinately lost in many organisms. Concatenated phylogenetic analysis provides robust resolution, for the first time, into the evolutionary order of emergence of the adaptor subunit families, showing AP-3 as the basal complex, followed by AP-5, AP-4, and AP-1 and AP-2. Thus, AP-5 is an evolutionarily ancient complex, which is involved in endosomal sorting, and which has links with hereditary spastic paraplegia.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Hirst J,Barlow LD,Francisco GC,Sahlender DA,Seaman MN,Dacks JB,Robinson MS

doi

10.1371/journal.pbio.1001170

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

e1001170

issue

10

eissn

1544-9173

issn

1545-7885

pii

PBIOLOGY-D-11-01394

journal_volume

9

pub_type

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