3VU2 image
Deposition Date 2012-06-14
Release Date 2013-05-08
Last Version Date 2024-03-20
Entry Detail
PDB ID:
3VU2
Keywords:
Title:
Structure of the Starch Branching Enzyme I (BEI) complexed with maltopentaose from Oryza sativa L
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.23 Å
R-Value Free:
0.28
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:1,4-alpha-glucan-branching enzyme, chloroplastic/amyloplastic
Gene (Uniprot):SBE1
Mutations:E399Q
Chain IDs:A, B
Chain Length:702
Number of Molecules:2
Biological Source:Oryza sativa Japonica Group
Peptide-like Molecules
PRD_900030
Primary Citation
Crystal structure of the rice branching enzyme I (BEI) in complex with maltopentaose.
Biochem.Biophys.Res.Commun. 424 508 511 (2012)
PMID: 22771800 DOI: 10.1016/j.bbrc.2012.06.145

Abstact

Starch branching enzyme (SBE) catalyzes the cleavage of α-1,4-linkages and the subsequent transfer of α-1,4 glucan to form an α-1,6 branch point in amylopectin. We determined the crystal structure of the rice branching enzyme I (BEI) in complex with maltopentaose at a resolution of 2.2Å. Maltopentaose bound to a hydrophobic pocket formed by the N-terminal helix, carbohydrate-binding module 48 (CBM48), and α-amylase domain. In addition, glucose moieties could be observed at molecular surfaces on the N-terminal helix (α2) and CBM48. Amino acid residues involved in the carbohydrate bindings are highly conserved in other SBEs, suggesting their generally conserved role in substrate binding for SBEs.

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Primary Citation of related structures