28HY | pdb_000028hy

Cryo-EM structure of human TMEM45A with a bound 2-Hydroxypalmitate

PDB DOI: https://doi.org/10.2210/pdb28HY/pdb
EM Map EMD-56534: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Homo sapiens
Expression System: Homo sapiens
Mutation(s): No

Deposited: 2026-02-01 Released: 2026-10-14
Deposition Author(s): Grieben, M., Inderhees, J.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.27 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

Literature

Cryo-EM structure of human TMEM45A with a bound 2-Hydroxypalmitate.

Grieben, M., Inderhees, J., Ebersberger, N.

(2026) J Struct Biol 218: 108378-108378

PubMed: 42800517 Search on PubMed
DOI: https://doi.org/10.1016/j.jsb.2026.108378
Primary Citation Related Structures:
28HY

PubMed Abstract:
The orphan transmembrane protein 45 A (TMEM45A) is highly expressed in keratinocytes as well as cancer cells under hypoxic conditions, where it contributes to metastasis and chemoresistance. The structure of human TMEM45A, determined with single-particle cryo-electron microscopy (cryo-EM) to 3.27 Å, reveals a homotetrameric assembly of seven-transmembrane-helix protomers. The first six transmembrane helices (TMHs) of each protomer assemble to form a central hydrophobic tunnel containing a 2-hydroxypalmitate.

Organizational Affiliation

Institute of Biochemistry, Center of Structural and Cell Biology in Medicine, University of Lübeck, 23562 Lübeck, Germany. Electronic address: Mariana.Grieben@uni-luebeck.de.

Macromolecule Content

Total Structure Weight: 128.44 kDa
Atom Count: 8,016
Modeled Residue Count: 972
Deposited Residue Count: 1,100
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transmembrane protein 45A	A, B, C, D	275	Homo sapiens	Mutation(s): 0 Gene Names: TMEM45A, DERP7, DNAPTP4
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NWC5 (Homo sapiens) Explore Q9NWC5 Go to UniProtKB: Q9NWC5
PHAROS: Q9NWC5 GTEx: ENSG00000181458
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q9NWC5
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1JXZ( Subject of Investigation/LOI) Query on A1JXZ Download:Ideal Coordinates CCD File SDF format, chain G [auth A] SDF format, chain M [auth C] SDF format, chain P [auth D] SDF format, chain J [auth B] MOL2 format, chain G [auth A] MOL2 format, chain M [auth C] MOL2 format, chain P [auth D] MOL2 format, chain J [auth B] mmCIF format, chain G [auth A] mmCIF format, chain M [auth C] mmCIF format, chain P [auth D] mmCIF format, chain J [auth B]	G [auth A], J [auth B], M [auth C], P [auth D]	(R)-2-hydroxypalmitic acid C₁₆ H₃₂ O₃ JGHSBPIZNUXPLA-OAHLLOKOSA-N		Interactions Focus chain G [auth A] Focus chain J [auth B] Focus chain M [auth C] Focus chain P [auth D] Interactions & Density Focus chain G [auth A] Focus chain J [auth B] Focus chain M [auth C] Focus chain P [auth D]
UNX (Subject of Investigation/LOI) Query on UNX Download:Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain F [auth A] SDF format, chain H [auth B] SDF format, chain I [auth B] SDF format, chain K [auth C] SDF format, chain L [auth C] SDF format, chain N [auth D] SDF format, chain O [auth D] MOL2 format, chain E [auth A] MOL2 format, chain F [auth A] MOL2 format, chain H [auth B] MOL2 format, chain I [auth B] MOL2 format, chain K [auth C] MOL2 format, chain L [auth C] MOL2 format, chain N [auth D] MOL2 format, chain O [auth D] mmCIF format, chain E [auth A] mmCIF format, chain F [auth A] mmCIF format, chain H [auth B] mmCIF format, chain I [auth B] mmCIF format, chain K [auth C] mmCIF format, chain L [auth C] mmCIF format, chain N [auth D] mmCIF format, chain O [auth D]	E [auth A] F [auth A] H [auth B] I [auth B] K [auth C] E [auth A], F [auth A], H [auth B], I [auth B], K [auth C], L [auth C], N [auth D], O [auth D]	UNKNOWN ATOM OR ION X		Interactions Focus chain E [auth A] Focus chain F [auth A] Focus chain H [auth B] Focus chain I [auth B] Focus chain K [auth C] Focus chain L [auth C] Focus chain N [auth D] Focus chain O [auth D] Interactions & Density Focus chain E [auth A] Focus chain F [auth A] Focus chain H [auth B] Focus chain I [auth B] Focus chain K [auth C] Focus chain L [auth C] Focus chain N [auth D] Focus chain O [auth D]