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TitleHigh throughput cryo-EM provides structural understanding for modulators of the lysosomal ion channel TRPML1.
Journal, issue, pagesStructure, Vol. 33, Issue 8, Page 1374-11385.e7, Year 2025
Publish dateAug 7, 2025
AuthorsJudith Reeks / Pravin Mahajan / Mellissa Clark / Suzanna R Cowan / Elena Di Daniel / Christopher P Earl / Samantha Fisher / Rhian S Holvey / Scott M Jackson / Emyr Lloyd-Evans / Carmine M Morgillo / Paul N Mortenson / Marc O'Reilly / Caroline J Richardson / Patrick Schöpf / Daniel M Tams / Helen Waller-Evans / Simon E Ward / Stuart Whibley / Pamela A Williams / Christopher N Johnson /
PubMed AbstractAccess to high-resolution structural data for protein-ligand complexes is a prerequisite for structure-based medicinal chemistry, where the ability to iterate cycles of design-structure-redesign is ...Access to high-resolution structural data for protein-ligand complexes is a prerequisite for structure-based medicinal chemistry, where the ability to iterate cycles of design-structure-redesign is highly desirable. For proteins refractory to X-ray crystallography, such as integral membrane proteins, enablement of high throughput structure determination by cryoelectron microscopy (cryo-EM) has the potential to be transformational for structure-based design. We have applied such an approach to the lysosomal ion channel transient receptor potential mucolipin 1 (TRPML1) in complex with ten chemically diverse modulators, both agonists and antagonists. The resulting depth of high-resolution structural data generated provides important insights into protein-ligand structure-function relationships, including mechanistic understanding of ligand-induced channel pore opening and closing. Moreover, the knowledge gained has the potential to support iterative design cycles toward improved modulators of this important biological target.
External linksStructure / PubMed:40532704
MethodsEM (single particle)
Resolution2.1 - 2.4 Å
Structure data

EMDB-52210, PDB-9hj6:
TRPML1 in complex with compound 2
Method: EM (single particle) / Resolution: 2.3 Å

EMDB-52211, PDB-9hj8:
TRPML1 in complex with compound 5
Method: EM (single particle) / Resolution: 2.1 Å

EMDB-52242, PDB-9hl3:
TRPML1 in complex with compound 1a
Method: EM (single particle) / Resolution: 2.1 Å

EMDB-52243, PDB-9hl4:
TRPML1 in complex with compound 3
Method: EM (single particle) / Resolution: 2.1 Å

EMDB-52245, PDB-9hl6:
TRPML1 in complex with compound 4a
Method: EM (single particle) / Resolution: 2.2 Å

EMDB-52246, PDB-9hl8:
TRPML1 in complex with compound 8
Method: EM (single particle) / Resolution: 2.2 Å

EMDB-52248, PDB-9hla:
TRPML1 in complex with compound 9a
Method: EM (single particle) / Resolution: 2.4 Å

EMDB-52249, PDB-9hlb:
TRPML1 in complex with compound 10
Method: EM (single particle) / Resolution: 2.1 Å

EMDB-52250, PDB-9hlc:
TRPML1 in complex with compound 11
Method: EM (single particle) / Resolution: 2.1 Å

EMDB-52251, PDB-9hld:
TRPML1 in complex with compound 13
Method: EM (single particle) / Resolution: 2.2 Å

Chemicals

ChemComp-EUJ:
(2R)-3-{[(S)-hydroxy{[(1S,2R,3R,4S,5S,6R)-2,4,6-trihydroxy-3,5-bis(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl dioctanoate

PDB-1ivc:
STRUCTURES OF AROMATIC INHIBITORS OF INFLUENZA VIRUS NEURAMINIDASE

ChemComp-HEX:
HEXANE

ChemComp-R16:
HEXADECANE

ChemComp-OCT:
N-OCTANE

ChemComp-HOH:
WATER

PDB-1ivd:
STRUCTURES OF AROMATIC INHIBITORS OF INFLUENZA VIRUS NEURAMINIDASE

ChemComp-PC1:
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / phospholipid*YM

ChemComp-D10:
DECANE

ChemComp-D12:
DODECANE

PDB-1ivz:
Solution structure of the SEA domain from murine hypothetical protein homologous to human mucin 16

PDB-1iv0:
Solution structure of the YqgF-family protein (N-terminal fragment)

ChemComp-LNK:
PENTANE

PDB-1iv1:
Structure of 2C-Methyl-D-erythritol-2,4-cyclodiphosphate Synthase

PDB-1iv2:
Structure of 2C-Methyl-D-erythritol-2,4-cyclodiphosphate Synthase (bound form CDP)

ChemComp-PLC:
DIUNDECYL PHOSPHATIDYL CHOLINE / phospholipid*YM

PDB-1iv3:
Structure of 2C-Methyl-D-erythritol-2,4-cyclodiphosphate Synthase (bound form MG atoms)

ChemComp-8K6:
Octadecane

PDB-1iv4:
Structure of 2C-Methyl-D-erythritol-2,4-cyclodiphosphate Synthase (bound form Substrate)

PDB-1iv5:
New Crystal Form of Human CD81 Large Extracellular Loop.

PDB-1iv6:
Solution Structure of the DNA Complex of Human TRF1

Source
  • homo sapiens (human)
KeywordsMEMBRANE PROTEIN / Ion channel

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