5GOR

Crystal structure of alkaline invertase InvA from Anabaena sp. PCC 7120


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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This is version 1.1 of the entry. See complete history


Literature

Structural Analysis of the Catalytic Mechanism and Substrate Specificity of Anabaena Alkaline Invertase InvA Reveals a Novel Glucosidase

Xie, J.Cai, K.Hu, H.X.Jiang, Y.L.Yang, F.Hu, P.F.Cao, D.D.Li, W.F.Chen, Y.Zhou, C.Z.

(2016) J Biol Chem 291: 25667-25677

  • DOI: 10.1074/jbc.M116.759290
  • Primary Citation of Related Structures:  
    5GOP, 5GOO, 5GOR, 5GOQ

  • PubMed Abstract: 
  • Invertases catalyze the hydrolysis of sucrose to glucose and fructose, thereby playing a key role in primary metabolism and plant development. According to the optimum pH, invertases are classified into acid invertases (Ac-Invs) and alkaline/neutral invertases (A/N-Invs), which share no sequence homology ...

    Invertases catalyze the hydrolysis of sucrose to glucose and fructose, thereby playing a key role in primary metabolism and plant development. According to the optimum pH, invertases are classified into acid invertases (Ac-Invs) and alkaline/neutral invertases (A/N-Invs), which share no sequence homology. Compared with Ac-Invs that have been extensively studied, the structure and catalytic mechanism of A/N-Invs remain unknown. Here we report the crystal structures of Anabaena alkaline invertase InvA, which was proposed to be the ancestor of modern plant A/N-Invs. These structures are the first in the GH100 family. InvA exists as a hexamer in both crystal and solution. Each subunit consists of an (α/α) 6 barrel core structure in addition to an insertion of three helices. A couple of structures in complex with the substrate or products enabled us to assign the subsites -1 and +1 specifically binding glucose and fructose, respectively. Structural comparison combined with enzymatic assays indicated that Asp-188 and Glu-414 are putative catalytic residues. Further analysis of the substrate binding pocket demonstrated that InvA possesses a stringent substrate specificity toward the α1,2-glycosidic bond of sucrose. Together, we suggest that InvA and homologs represent a novel family of glucosidases.


    Organizational Affiliation

    From the Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei Anhui 230027, China zcz@ustc.edu.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alkaline InvertaseA, B, C, D, E, F476Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Gene Names: invAalr1521
EC: 3.2.1.26
UniProt
Find proteins for Q8YWS9 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
Explore Q8YWS9 
Go to UniProtKB:  Q8YWS9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.171α = 90
b = 179.282β = 105.92
c = 96.362γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOLREPmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31370757

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-02
    Type: Initial release
  • Version 1.1: 2016-12-14
    Changes: Database references