1AF6

MALTOPORIN SUCROSE COMPLEX

• PDB DOI: https://doi.org/10.2210/pdb1AF6/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 1997-03-21 Released: 1998-03-25 
• Deposition Author(s): Dutzler, R., Schirmer, T.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.214 
• R-Value Work: 0.195 

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 143.4 kDa 
• Atom Count: 10,517 
• Modelled Residue Count: 1,263 
• Deposited Residue Count: 1,263 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MALTOPORIN	A, B, C	421	Escherichia coli	Mutation(s): 0  Gene Names: LAMB Membrane Entity: Yes
UniProt
Find proteins for P02943 (Escherichia coli (strain K12)) Explore P02943  Go to UniProtKB:  P02943

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-fructofuranose-(2-1)-alpha-D-glucopyranose	D, E, F	2		N/A
Glycosylation Resources
GlyTouCan:  G05551OP GlyCosmos:  G05551OP

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG	G [auth A], H [auth A], I [auth B], J [auth C]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900003	D, E, F	sucrose	Oligosaccharide / Nutrient

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.214 
• R-Value Work: 0.195 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 129.66	α = 90
b = 211.51	β = 90
c = 217.91	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
ROTAVATA	data reduction
CCP4	model building
PROLSQ	refinement
CCP4	data scaling
CCP4	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-03-25 
Deposition Author(s): Dutzler, R., Schirmer, T.

Revision History  

• Version 1.0: 1998-03-25
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
• Version 2.1: 2023-08-02
  Changes: Database references, Refinement description, Structure summary