6IWK

The Structure of Maltooligosaccharide-forming Amylase from Pseudomonas saccharophila STB07


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of maltotetraose-forming amylase from Pseudomonas saccharophila STB07 provides insights into its product specificity.

Zhang, Z.Jin, T.Xie, X.Ban, X.Li, C.Hong, Y.Cheng, L.Gu, Z.Li, Z.

(2020) Int J Biol Macromol 154: 1303-1313

  • DOI: https://doi.org/10.1016/j.ijbiomac.2019.11.006
  • Primary Citation of Related Structures:  
    6IWK, 6JQB

  • PubMed Abstract: 

    The maltooligosaccharide-forming amylases (MFAses) degrade starch into maltooligosaccharides which potentially benefit human diet and grow popular in food processing, but little has been studied about their product specificity and structures. We focused on this topic and provide evidence through an X-ray crystal structure of the maltotetraose (G4)-forming amylase from Pseudomonas saccharophila STB07 (MFA ps ), as well as co-crystal structures of MFA ps with G4 and with pseudo-maltoheptaose (pseudo-G7) determined at up to 1.1 Å resolution. G4 and pseudo-G7 occupy active cleft subsites -4 to -1 and -4 to +3 respectively. Binding induces conformational changes in the active sites except Asp193, working as the base catalyst. Comparison of the MFA ps structure with those of other α-amylases revealed obvious differences in the loop structures providing dominant interactions between protein and substrate in the non-reducing side of the active sites cleft. These structures at the non-reducing end may govern the G4 specificity of MFA ps and also be relevant to its exo-type action pattern.


  • Organizational Affiliation

    School of Food Science and Technology, Jiangnan University, Wuxi 214122, People's Republic of China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucan 1,4-alpha-maltotetraohydrolase418Roseateles saccharophilusMutation(s): 0 
Gene Names: mta
EC: 3.2.1.60
UniProt
Find proteins for P22963 (Roseateles saccharophilus)
Explore P22963 
Go to UniProtKB:  P22963
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22963
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.193α = 90
b = 64.768β = 90
c = 168.736γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31722040
National Natural Science Foundation of ChinaChina31571882

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-11
    Type: Initial release
  • Version 1.1: 2021-03-31
    Changes: Database references