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TitleStructurally derived universal mechanism for the catalytic cycle of the tail-anchored targeting factor Get3.
Journal, issue, pagesNat Struct Mol Biol, Vol. 29, Issue 8, Page 820-830, Year 2022
Publish dateJul 18, 2022
AuthorsMichelle Y Fry / Vladimíra Najdrová / Ailiena O Maggiolo / Shyam M Saladi / Pavel Doležal / William M Clemons /
PubMed AbstractTail-anchored (TA) membrane proteins, accounting for roughly 2% of proteomes, are primarily targeted posttranslationally to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) ...Tail-anchored (TA) membrane proteins, accounting for roughly 2% of proteomes, are primarily targeted posttranslationally to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) pathway. For this complicated process, it remains unknown how the central targeting factor Get3 uses nucleotide to facilitate large conformational changes to recognize then bind clients while also preventing exposure of hydrophobic surfaces. Here, we identify the GET pathway in Giardia intestinalis and present the structure of the Get3-client complex in the critical postnucleotide-hydrolysis state, demonstrating that Get3 reorganizes the client-binding domain (CBD) to accommodate and shield the client transmembrane helix. Four additional structures of GiGet3, spanning the nucleotide-free (apo) open to closed transition and the ATP-bound state, reveal the details of nucleotide stabilization and occluded CBD. This work resolves key conundrums and allows for a complete model of the dramatic conformational landscape of Get3.
External linksNat Struct Mol Biol / PubMed:35851188
MethodsEM (single particle) / X-ray diffraction
Resolution2.23 - 8.46 Å
Structure data

EMDB-25373: Get3 bound to ADP and the transmembrane domain of the tail-anchored protein Bos1 - nucleotide binding domain map
PDB-7sq0: Get3 bound to ADP and the transmembrane domain of the tail-anchored protein Bos1
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-25374: Get3 bound to ADP and the transmembrane domain of the tail-anchored protein Bos1 - overall map
Method: EM (single particle) / Resolution: 4.2 Å

EMDB-25375: Nucleotide-free Get3 in the closed form
Method: EM (single particle) / Resolution: 8.46 Å

PDB-7spy:
Get3 bound to ATP from G. intestinalis in the closed form
Method: X-RAY DIFFRACTION / Resolution: 2.23 Å

PDB-7spz:
Nucleotide-free Get3 in two open forms
Method: X-RAY DIFFRACTION / Resolution: 3.0 Å

Chemicals

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

ChemComp-SO4:
SULFATE ION

ChemComp-HOH:
WATER

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

Source
  • saccharomyces cerevisiae (brewer's yeast)
  • giardia intestinalis (strain atcc 50803 / wb clone c6) (eukaryote)
  • giardia lamblia atcc 50803 (eukaryote)
KeywordsCHAPERONE / Tail-anchored membrane protein targeting Deviant Walker A ATPase targeting factor

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