8CVY

Human glycogenin-1 and glycogen synthase-1 complex in the apo mobile state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The structural mechanism of human glycogen synthesis by the GYS1-GYG1 complex.

Fastman, N.M.Liu, Y.Ramanan, V.Merritt, H.Ambing, E.DePaoli-Roach, A.A.Roach, P.J.Hurley, T.D.Mellem, K.T.Ullman, J.C.Green, E.Morgans Jr., D.Tzitzilonis, C.

(2022) Cell Rep 40: 111041-111041

  • DOI: https://doi.org/10.1016/j.celrep.2022.111041
  • Primary Citation of Related Structures:  
    8CVX, 8CVY, 8CVZ

  • PubMed Abstract: 

    Glycogen is the primary energy reserve in mammals, and dysregulation of glycogen metabolism can result in glycogen storage diseases (GSDs). In muscle, glycogen synthesis is initiated by the enzymes glycogenin-1 (GYG1), which seeds the molecule by autoglucosylation, and glycogen synthase-1 (GYS1), which extends the glycogen chain. Although both enzymes are required for proper glycogen production, the nature of their interaction has been enigmatic. Here, we present the human GYS1:GYG1 complex in multiple conformations representing different functional states. We observe an asymmetric conformation of GYS1 that exposes an interface for close GYG1 association, and propose this state facilitates handoff of the GYG1-associated glycogen chain to a GYS1 subunit for elongation. Full activation of GYS1 widens the GYG1-binding groove, enabling GYG1 release concomitant with glycogen chain growth. This structural mechanism connecting chain nucleation and extension explains the apparent stepwise nature of glycogen synthesis and suggests distinct states to target for GSD-modifying therapeutics.


  • Organizational Affiliation

    Maze Therapeutics, 171 Oyster Point Blvd, Suite 300, South San Francisco, CA 94080, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycogen [starch] synthase, muscleA,
C,
E [auth D],
G [auth B]
634Homo sapiensMutation(s): 2 
Gene Names: GYS1GYS
EC: 2.4.1.11
UniProt & NIH Common Fund Data Resources
Find proteins for P13807 (Homo sapiens)
Explore P13807 
Go to UniProtKB:  P13807
PHAROS:  P13807
GTEx:  ENSG00000104812 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13807
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Glycogenin-1B [auth E],
D [auth G],
F [auth H]
352Homo sapiensMutation(s): 1 
Gene Names: GYG1GYG
EC: 2.4.1.186
UniProt & NIH Common Fund Data Resources
Find proteins for P46976 (Homo sapiens)
Explore P46976 
Go to UniProtKB:  P46976
PHAROS:  P46976
GTEx:  ENSG00000163754 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46976
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTREFMAC
RECONSTRUCTIONcryoSPARCv3.3.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other privateUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2022-07-13
    Type: Initial release
  • Version 1.1: 2022-07-20
    Changes: Database references
  • Version 1.2: 2022-12-14
    Changes: Data processing
  • Version 1.3: 2024-06-12
    Changes: Data collection