9IBT | pdb_00009ibt

Branching Sucrase Brs-B in complex with isomaltopentaose in the active site (alternative conformation)

• PDB DOI: https://doi.org/10.2210/pdb9IBT/pdb

• Classification: CYTOSOLIC PROTEIN
• Organism(s): Leuconostoc citreum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-02-13 Released: 2026-08-26 
• Deposition Author(s): Cioci, G., Moulis, C., Claverie, M., Benkholouche, M., Remaud-Simeon, M.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free: 
  0.225 (Depositor), 0.226 (DCC) 
• R-Value Work: 
  0.201 (Depositor), 0.203 (DCC) 

Starting Model: experimental

Literature

Structure of Brs-B

Cioci, G.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: homology

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 272.03 kDa 
• Atom Count: 18,642 
• Modeled Residue Count: 2,306 
• Deposited Residue Count: 2,366 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
dextransucrase	A, B	1,183	Leuconostoc citreum	Mutation(s): 0  Gene Names: LCIT_06060 EC: 2.4.1.5
UniProt
Find proteins for A0A5A5U0V5 (Leuconostoc citreum) Explore A0A5A5U0V5  Go to UniProtKB:  A0A5A5U0V5

Oligosaccharides

Help  

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose	C, D	3		N/A

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose	E, F [auth Z], J [auth R]	4		N/A

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose	G [auth X]	5		N/A

Entity ID: 5
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose	H [auth K], I [auth T]	9		N/A

Entity ID: 6
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose	K [auth P]	2		N/A

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	L [auth A], M [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free:  0.225 (Depositor), 0.226 (DCC) 
• R-Value Work:  0.201 (Depositor), 0.203 (DCC) 

Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 253.639	α = 90
b = 253.639	β = 90
c = 344.433	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-08-26 
Deposition Author(s): Cioci, G., Moulis, C., Claverie, M., Benkholouche, M., Remaud-Simeon, M.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2026-08-26
  Type: Initial release