The Structure of Wild-type MalL from Bacillus subtilis

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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Change in heat capacity for enzyme catalysis determines temperature dependence of enzyme catalyzed rates.

Hobbs, J.K.Jiao, W.Easter, A.D.Parker, E.J.Schipper, L.A.Arcus, V.L.

(2013) ACS Chem Biol 8: 2388-2393

  • DOI: https://doi.org/10.1021/cb4005029
  • Primary Citation of Related Structures:  
    4M56, 4M8U, 4MAZ, 4MB1

  • PubMed Abstract: 

    The increase in enzymatic rates with temperature up to an optimum temperature (Topt) is widely attributed to classical Arrhenius behavior, with the decrease in enzymatic rates above Topt ascribed to protein denaturation and/or aggregation. This account persists despite many investigators noting that denaturation is insufficient to explain the decline in enzymatic rates above Topt. Here we show that it is the change in heat capacity associated with enzyme catalysis (ΔC(‡)p) and its effect on the temperature dependence of ΔG(‡) that determines the temperature dependence of enzyme activity. Through mutagenesis, we demonstrate that the Topt of an enzyme is correlated with ΔC(‡)p and that changes to ΔC(‡)p are sufficient to change Topt without affecting the catalytic rate. Furthermore, using X-ray crystallography and molecular dynamics simulations we reveal the molecular details underpinning these changes in ΔC(‡)p. The influence of ΔC(‡)p on enzymatic rates has implications for the temperature dependence of biological rates from enzymes to ecosystems.

  • Organizational Affiliation

    Department of Biological Sciences, Faculty of Science and Engineering, University of Waikato , Hamilton 3240, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oligo-1,6-glucosidase 1
A, B
561Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: malLyvdLBSU34560
Find proteins for O06994 (Bacillus subtilis (strain 168))
Explore O06994 
Go to UniProtKB:  O06994
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO06994
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.65α = 90
b = 100.26β = 103.28
c = 101.49γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction
ADSCdata collection

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2013-11-27
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Derived calculations, Structure summary
  • Version 1.3: 2024-02-28
    Changes: Advisory, Data collection, Database references, Structure summary