25WG | pdb_000025wg

Cryo-EM structure of the human SAM complex

• PDB DOI: https://doi.org/10.2210/pdb25WG/pdb
• EM Map EMD-80424: EMDB EMDataResource
• EM Map EMD-63183: EMDB EMDataResource

• Classification: TRANSLOCASE
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2026-04-20 Released: 2026-09-30 
• Deposition Author(s): Yan, L., Guan, Z., Wang, Q., Yin, P.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structures of monomeric and dimeric human SAM complexes.

Yan, L., Guan, Z., Wang, Q., Wu, Y., Qi, L., Huang, C., Zhang, J., Hong, S., Zhuang, J., Huang, R., Zhang, L., Duan, R., Liu, Y., Liu, Z., Yin, P.

(2026) Cell Res 

• PubMed: 42806033 
• DOI: https://doi.org/10.1038/s41422-026-01305-w
• Primary Citation Related Structures: 
  25WF, 25WG

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Organizational Affiliation: 
• National Key Laboratory of Crop Genetic Improvement, College of Bio-X, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China.
National Key Laboratory of Crop Genetic Improvement, College of Bio-X, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, Hubei, China. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 87.43 kDa 
• Atom Count: 5,313 
• Modeled Residue Count: 672 
• Deposited Residue Count: 784 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sorting and assembly machinery component 50 homolog	A	489	Homo sapiens	Mutation(s): 0  Gene Names: SAMM50, SAM50, CGI-51, TRG3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y512 (Homo sapiens) Explore Q9Y512  Go to UniProtKB:  Q9Y512
PHAROS:  Q9Y512 GTEx:  ENSG00000100347

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Metaxin-2	B	295	Homo sapiens	Mutation(s): 0  Gene Names: MTX2
UniProt & NIH Common Fund Data Resources
Find proteins for O75431 (Homo sapiens) Explore O75431  Go to UniProtKB:  O75431
PHAROS:  O75431 GTEx:  ENSG00000128654

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-30 
Deposition Author(s): Yan, L., Guan, Z., Wang, Q., Yin, P.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History  

• Version 1.0: 2026-09-30
  Type: Initial release
  
• Version 1.1: 2026-10-21
  Changes: Data collection, Database references