5DI3

Crystal structure of Arl13B in complex with Arl3 of Chlamydomonas reinhardtii

Summary for 5DI3

• Entry DOI: 10.2210/pdb5di3/pdb
• Descriptor: ADP-ribosylation factor-like protein 13B, ADP-ribosylation factor-like protein 3, PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER, ... (5 entities in total)
• Functional Keywords: g-protein, adp ribosylation like protein, complex, guanine nucleotide exchange factor, hydrolase
• Biological source: Chlamydomonas reinhardtii; More
• Cellular location: Cell projection, cilium membrane : A8INQ0; Golgi apparatus membrane ; Peripheral membrane protein ; Cytoplasmic side : A8ISN6
• Total number of polymer chains: 2
• Total formula weight: 51238.01

Authors

Gotthardt, K.,Lokaj, M.,Falk, N.,Koerner, C.,Giessl, A.,Wittinghofer, A. (deposition date: 2015-08-31, release date: 2015-11-18, Last modification date: 2024-01-10)

Primary citation

Gotthardt, K.,Lokaj, M.,Koerner, C.,Falk, N.,Giel, A.,Wittinghofer, A.
A G-protein activation cascade from Arl13B to Arl3 and implications for ciliary targeting of lipidated proteins.
Elife, 4:-, 2015

PubMed Abstract: Small G-proteins of the ADP-ribosylation-factor-like (Arl) subfamily have been shown to be crucial to ciliogenesis and cilia maintenance. Active Arl3 is involved in targeting and releasing lipidated cargo proteins from their carriers PDE6δ and UNC119a/b to the cilium. However, the guanine nucleotide exchange factor (GEF) which activates Arl3 is unknown. Here we show that the ciliary G-protein Arl13B mutated in Joubert syndrome is the GEF for Arl3, and its function is conserved in evolution. The GEF activity of Arl13B is mediated by the G-domain plus an additional C-terminal helix. The switch regions of Arl13B are involved in the interaction with Arl3. Overexpression of Arl13B in mammalian cell lines leads to an increased Arl3·GTP level, whereas Arl13B Joubert-Syndrome patient mutations impair GEF activity and thus Arl3 activation. We anticipate that through Arl13B's exclusive ciliary localization, Arl3 activation is spatially restricted and thereby an Arl3·GTP compartment generated where ciliary cargo is specifically released.

PubMed: 26551564
DOI: 10.7554/eLife.11859

Experimental method

X-RAY DIFFRACTION (2.5 Å)