Structure of SMCR8 bound FEM1B

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report

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Structural insights into SMCR8 C-degron recognition by FEM1B.

Zhao, S.Ru, W.Chen, X.Liao, S.Zhu, Z.Zhang, J.Xu, C.

(2021) Biochem Biophys Res Commun 557: 236-239

  • DOI: https://doi.org/10.1016/j.bbrc.2021.04.046
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    C-degrons play critical roles in targeting the receptor proteins of Cullin-RING E3 ligase complexes to initiate protein degradation. FEM1 proteins, including FEM1A, FEM1B, and FEM1C, act as the receptors to specifically recognize Arg/C-degrons to enable CRL2-mediated protein turnover. Very few substrates have been identified for FEM1B, except CDK5R1. We found that CRL2 FEM1B also recognizes the C-degron of an SMCR8 isoform, and uncovered the recognition of SMCR8 by FEM1B through presenting the structure of FEM1B bound to SMCR8. Our work provides insights into the role of CRL2 FEM1B in regulating the lifetime of SMCR8, a critical autophagy regulator.

  • Organizational Affiliation

    MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein fem-1 homolog B,Guanine nucleotide exchange protein SMCR8
A, B
357Homo sapiensMutation(s): 0 
Gene Names: FEM1BF1AAKIAA0396SMCR8
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UK73 (Homo sapiens)
Explore Q9UK73 
Go to UniProtKB:  Q9UK73
GTEx:  ENSG00000169018 
Find proteins for Q8TEV9 (Homo sapiens)
Explore Q8TEV9 
Go to UniProtKB:  Q8TEV9
GTEx:  ENSG00000176994 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ8TEV9Q9UK73
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.306α = 90
b = 91.497β = 90
c = 112.148γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-12
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Refinement description