3AML

Structure of the Starch Branching Enzyme I (BEI) from Oryza sativa L


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of the branching enzyme I (BEI) from Oryza sativa L with implications for catalysis and substrate binding.

Noguchi, J.Chaen, K.Vu, N.T.Akasaka, T.Shimada, H.Nakashima, T.Nishi, A.Satoh, H.Omori, T.Kakuta, Y.Kimura, M.

(2011) Glycobiology 21: 1108-1116

  • DOI: https://doi.org/10.1093/glycob/cwr049
  • Primary Citation of Related Structures:  
    3AMK, 3AML

  • PubMed Abstract: 

    Starch-branching enzyme 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. Sequence analysis of the rice-branching enzyme I (BEI) indicated a modular structure in which the central α-amylase domain is flanked on each side by the N-terminal carbohydrate-binding module 48 and the α-amylase C-domain. We determined the crystal structure of BEI at a resolution of 1.9 Å by molecular replacement using the Escherichia coli glycogen BE as a search model. Despite three modular structures, BEI is roughly ellipsoidal in shape with two globular domains that form a prominent groove which is proposed to serve as the α-polyglucan-binding site. Amino acid residues Asp344 and Glu399, which are postulated to play an essential role in catalysis as a nucleophile and a general acid/base, respectively, are located at a central cleft in the groove. Moreover, structural comparison revealed that in BEI, extended loop structures cause a narrowing of the substrate-binding site, whereas shortened loop structures make a larger space at the corresponding subsite in the Klebsiella pneumoniae pullulanase. This structural difference might be attributed to distinct catalytic reactions, transglycosylation and hydrolysis, respectively, by BEI and pullulanase.


  • Organizational Affiliation

    Laboratory of Structural Biology, Graduate School of Systems Life Sciences, Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Os06g0726400 protein755Oryza sativa Japonica GroupMutation(s): 0 
Gene Names: Os06g0726400SBE1
EC: 2.4.1.18
UniProt
Find proteins for Q01401 (Oryza sativa subsp. japonica)
Explore Q01401 
Go to UniProtKB:  Q01401
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01401
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download Ideal Coordinates CCD File 
D [auth A]4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
SIN
Query on SIN

Download Ideal Coordinates CCD File 
IA [auth A],
L [auth A]
SUCCINIC ACID
C4 H6 O4
KDYFGRWQOYBRFD-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth A]
BA [auth A]
C [auth A]
CA [auth A]
DA [auth A]
AA [auth A],
BA [auth A],
C [auth A],
CA [auth A],
DA [auth A],
E [auth A],
EA [auth A],
F [auth A],
FA [auth A],
GA [auth A],
H [auth A],
HA [auth A],
J [auth A],
JA [auth A],
K [auth A],
KA [auth A],
LA [auth A],
M [auth A],
MA [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A],
Y [auth A],
Z [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
BME
Query on BME

Download Ideal Coordinates CCD File 
B [auth A],
I [auth A]
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
ACT
Query on ACT

Download Ideal Coordinates CCD File 
G [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.066α = 90
b = 124.85β = 97.29
c = 67.88γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-28
    Type: Initial release
  • Version 1.1: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description