ISDA: 3V91

Deposition Date 2011-12-23

Release Date 2012-01-25

Last Version Date 2024-02-28

Entry Detail

PDB ID:

3V91

Keywords:

TRANSFERASE

Title:

Structure of T82M glycogenin mutant truncated at residue 270 complexed with UDP-glucose

Biological Source:

Source Organism(s):

Oryctolagus cuniculus (Taxon ID: 9986)

Expression System(s):

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.00 Å

R-Value Free:

0.23

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

I 2 2 2

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Glycogenin-1
Gene (Uniprot):GYG1
Mutagens:T82M
Chain IDs:A
Chain Length:291
Number of Molecules:1
Biological Source:Oryctolagus cuniculus

UniProt ID:P13280 Pfam ID:PF01501 EC:2.4.1.186

Ligand Molecules

GOL

UPG

Primary Citation

Structural and biochemical insight into glycogenin inactivation by the glycogenosis-causing T82M mutation.

Carrizo, M.E, Romero, J.M, Issoglio, F.M, Curtino, J.A.Show

Febs Lett. 586 254 257 (2012)

PMID: 22226635 DOI: 10.1016/j.febslet.2011.12.028

Abstact

The X-ray structure of rabbit glycogenin containing the T82M (T83M according to previous authors amino acid numbering) mutation causing glycogenosis showed the loss of Thr82 hydrogen bond to Asp162, the residue involved in the activation step of the glucose transfer reaction mechanism. Autoglucosylation, maltoside transglucosylation and UDP-glucose hydrolyzing activities were abolished even though affinity and interactions with UDP-glucose and positioning of Tyr194 acceptor were conserved. Substitution of Thr82 for serine but not for valine restored the maximum extent of autoglucosylation as well as transglucosylation and UDP-glucose hydrolysis rate. Results provided evidence sustaining the essential role of the lost single hydrogen bond for UDP-glucose activation leading to glycogenin-bound glycogen primer synthesis.

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Primary Citation of related structures

Abstact

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