ISDA

Entry Detail

PDB ID:

4BB9

Keywords:

PROTEIN-BINDING PROTEIN

Title:

Crystal structure of glucokinase regulatory protein complexed to fructose-1-phosphate

Biological Source:

Source Organism:

HOMO SAPIENS

Host Organism:

TRICHOPLUSIA NI

PDB Version:

Deposition Date:

2012-09-21

Release Date:

2013-05-15

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.47 Å

R-Value Free:

0.17

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:GLUCOKINASE REGULATORY PROTEIN
Mutations:YES
Chain IDs:A
Chain Length:633
Number of Molecules:1
Biological Source:HOMO SAPIENS

UniProt ID:Q14397 Pfam ID:PF22645, PF22198, PF20741

Ligand Molecules

F1P

Primary Citation

Crystal Structure of Glucokinase Regulatory Protein.

Pautsch, A, Stadler, N, Loehle, A, Rist, W, Berg, A, Glocker, L, Nar, H, Reinert, D, Lenter, M, Heckel, A, Schnapp, G, Kauschke, S.G.Show

Biochemistry 52 3523 ? (2013)

PMID: 23621087 DOI: 10.1021/BI4000782

Abstact

Glucokinase (GK) plays a major role in the regulation of blood glucose homeostasis in both the liver and the pancreas. In the liver, GK is controlled by the GK regulatory protein (GKRP). GKRP in turn is activated by fructose 6-phosphate (F6P) and inactivated by fructose 1-phosphate (F1P). Disrupting the GK-GKRP complex increases the activity of GK in the cytosol and is considered an attractive concept for the regulation of blood glucose. We have determined the crystal structure of GKRP in its inactive F1P-bound form. The binding site for F1P is located deeply buried at a domain interface, and H-D exchange experiments confirmed that F1P and F6P compete for this site. The structure of the inactive GKRP-F1P complex provides a starting point for understanding the mechanism of fructose phosphate-dependent GK regulation at an atomic level.

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Primary Citation of related structures