7JTZ

Yeast Glo3 GAP domain

Summary for 7JTZ

• Entry DOI: 10.2210/pdb7jtz/pdb
• Descriptor: ADP-ribosylation factor GTPase-activating protein GLO3, ZINC ION, GLYCEROL, ... (4 entities in total)
• Functional Keywords: arfgap domain, gtpase activating protein domain, membrane trafficking, copi, protein transport
• Biological source: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast)
• Total number of polymer chains: 4
• Total formula weight: 71418.95

Authors

Xie, B.,Jackson, L.P. (deposition date: 2020-08-18, release date: 2021-03-24, Last modification date: 2023-10-18)

Primary citation

Xie, B.,Jung, C.,Chandra, M.,Engel, A.,Kendall, A.K.,Jackson, L.P.
The Glo3 GAP crystal structure supports the molecular niche model for ArfGAPs in COPI coats.
Adv Biol Regul, 79:100781-100781, 2021

PubMed Abstract: Arf GTPase activating (ArfGAP) proteins are critical regulatory and effector proteins in membrane trafficking pathways. Budding yeast contain two ArfGAP proteins (Gcs1 and Glo3) implicated in COPI coat function at the Golgi, and yeast require Glo3 catalytic function for viability. A new X-ray crystal structure of the Glo3 GAP domain was determined at 2.1 Å resolution using molecular replacement methods. The structure reveals a Cys-family zinc finger motif with an invariant residue (R59) positioned to act as an "arginine finger" during catalysis. Comparisons among eukaryotic GAP domains show a key difference between ArfGAP1 and ArfGAP2/3 family members in the final helix located within the domain. Conservation at both the sequence and structural levels suggest the Glo3 GAP domain interacts with yeast Arf1 switch I and II regions to promote catalysis. Together, the structural data presented here provide additional evidence for placing Glo3 near Arf1 triads within membrane-assembled COPI coats and further support the molecular niche model for COPI coat regulation by ArfGAPs.

PubMed: 33436318
DOI: 10.1016/j.jbior.2020.100781

Experimental method

X-RAY DIFFRACTION (2.07 Å)