4MBP

MALTODEXTRIN BINDING PROTEIN WITH BOUND MALTETROSE

• PDB DOI:  https://doi.org/10.2210/pdb4MBP/pdb

• Classification: PERIPLASMIC BINDING PROTEIN
• Organism(s): Escherichia coli K-12
• Mutation(s): No 


• Deposited: 1997-08-17 Released: 1998-02-25 
• Deposition Author(s): Spurlino, J.C., Quiocho, F.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Work: 0.188 

Literature

Extensive features of tight oligosaccharide binding revealed in high-resolution structures of the maltodextrin transport/chemosensory receptor.

Quiocho, F.A., Spurlino, J.C., Rodseth, L.E.

(1997) Structure 5: 997-1015

• PubMed: 9309217 
• DOI: https://doi.org/10.1016/s0969-2126(97)00253-0
• Primary Citation of Related Structures:  
  1ANF, 3MBP, 4MBP


• PubMed Abstract: 
  

  Active-transport processes perform a vital function in the life of a cell, maintaining cell homeostasis and allowing access of nutrients. Maltodextrin/maltose-binding protein (MBP; M(r) = 40k) is a receptor protein which serves as an initial high-affinity binding component of the active-transport system of maltooligosaccharides in bacteria. MBP also participates in chemotaxis towards maltooligosaccharides. The interaction between MBP and specific cytoplasmic membrane proteins initiates either active transport or chemotaxis. In order to gain new understanding of the function of MBP, especially its versatility in binding different linear and cyclic oligosaccharides with similar affinities, we have undertaken high-resolution X-ray analysis of three oligosaccharide-bound structures.

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Organizational Affiliation: 

Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 41.42 kDa 
• Atom Count: 3,068 
• Modelled Residue Count: 370 
• Deposited Residue Count: 370 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MALTODEXTRIN BINDING PROTEIN	A	370	Escherichia coli K-12	Mutation(s): 0  Gene Names: malE, b4034, JW3994
UniProt
Find proteins for P0AEX9 (Escherichia coli (strain K12)) Explore P0AEX9  Go to UniProtKB:  P0AEX9

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	B	4		N/A
Glycosylation Resources
GlyTouCan:  G87171PZ GlyCosmos:  G87171PZ GlyGen:  G87171PZ

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900010	B	alpha-maltotetraose	Oligosaccharide / Substrate analog

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Work: 0.188 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 106.68	α = 90
b = 68.38	β = 112
c = 58.44	γ = 90

Software Package:

Software Name	Purpose
CHAIN	model building
PROLSQ	refinement
SDMS	data reduction
SDMS	data scaling
CHAIN	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-02-25 
Deposition Author(s): Spurlino, J.C., Quiocho, F.A.

Revision History  

• Version 1.0: 1998-02-25
  Type: Initial release
  
• Version 1.1: 2008-03-25
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
• Version 2.1: 2023-08-09
  Changes: Database references, Refinement description, Structure summary