Streptomyces bingchenggensis acetoacetate decarboxylase in non-covalent complex with potassium formate

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 

wwPDB Validation   3D Report Full Report

This is version 1.7 of the entry. See complete history


Sbi00515, a Protein of Unknown Function from Streptomyces bingchenggensis, Highlights the Functional Versatility of the Acetoacetate Decarboxylase Scaffold.

Mydy, L.S.Hoppe, R.W.Ochsenwald, J.M.Berndt, R.T.Severin, G.B.Schwabacher, A.W.Silvaggi, N.R.

(2015) Biochemistry 54: 3978-3988

  • DOI: https://doi.org/10.1021/acs.biochem.5b00483
  • Primary Citation of Related Structures:  
    4ZBO, 4ZBT

  • PubMed Abstract: 

    The acetoacetate decarboxylase-like superfamily (ADCSF) is a group of ~4000 enzymes that, until recently, was thought to be homogeneous in terms of the reaction catalyzed. Bioinformatic analysis shows that the ADCSF consists of up to seven families that differ primarily in their active site architectures. The soil-dwelling bacterium Streptomyces bingchenggensis BCW-1 produces an ADCSF enzyme of unknown function that shares a low level of sequence identity (~20%) with known acetoacetate decarboxylases (ADCs). This enzyme, Sbi00515, belongs to the MppR-like family of the ADCSF because of its similarity to the mannopeptimycin biosynthetic protein MppR from Streptomyces hygroscopicus. Herein, we present steady state kinetic data that show Sbi00515 does not catalyze the decarboxylation of any α- or β-keto acid tested. Rather, we show that Sbi00515 catalyzes the condensation of pyruvate with a number of aldehydes, followed by dehydration of the presumed aldol intermediate. Thus, Sbi00515 is a pyruvate aldolase-dehydratase and not an acetoacetate decarboxylase. We have also determined the X-ray crystal structures of Sbi00515 in complexes with formate and pyruvate. The structures show that the overall fold of Sbi00515 is nearly identical to those of both ADC and MppR. The pyruvate complex is trapped as the Schiff base, providing evidence that the Schiff base chemistry that drives the acetoacetate decarboxylases has been co-opted to perform a new function, and that this core chemistry may be conserved across the superfamily. The structures also suggest possible catalytic roles for several active site residues.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, 3210 North Cramer Street, Milwaukee, Wisconsin 53211, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetoacetate decarboxylase
A, B, C, D
265Streptomyces bingchenggensis BCW-1Mutation(s): 0 
Gene Names: SBI_00515
Find proteins for D7C0E5 (Streptomyces bingchenggensis (strain BCW-1))
Explore D7C0E5 
Go to UniProtKB:  D7C0E5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD7C0E5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PE4

Download Ideal Coordinates CCD File 
C16 H34 O8
Query on ETE

Download Ideal Coordinates CCD File 
C9 H20 O5
Query on PEG

Download Ideal Coordinates CCD File 
H [auth A],
M [auth B],
Q [auth C],
R [auth C],
V [auth D]
C4 H10 O3
Query on FMT

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
J [auth B]
K [auth B]
E [auth A],
F [auth A],
G [auth A],
J [auth B],
K [auth B],
N [auth C],
O [auth C],
P [auth C],
S [auth D],
T [auth D],
U [auth D]
C H2 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.9α = 90
b = 124.4β = 90
c = 53.2γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesMCB-1157392

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-17
    Type: Initial release
  • Version 1.1: 2015-07-15
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Advisory, Author supporting evidence, Database references, Derived calculations, Source and taxonomy
  • Version 1.3: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.4: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.5: 2022-03-16
    Changes: Database references, Structure summary
  • Version 1.6: 2023-05-17
    Changes: Database references, Structure summary
  • Version 1.7: 2024-05-22
    Changes: Data collection