Crystal structure of an esterase from the bacterial hormone-sensitive lipase (HSL) family

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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Interdomain Hydrophobic Interactions Modulate the Thermostability of Microbial Esterases from the Hormone-Sensitive Lipase Family.

Li, P.Y.Chen, X.L.Ji, P.Li, C.Y.Wang, P.Zhang, Y.Xie, B.B.Qin, Q.L.Su, H.N.Zhou, B.C.Zhang, Y.Z.Zhang, X.Y.

(2015) J Biol Chem 290: 11188-11198

  • DOI: https://doi.org/10.1074/jbc.M115.646182
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Microbial hormone-sensitive lipases (HSLs) contain a CAP domain and a catalytic domain. However, it remains unclear how the CAP domain interacts with the catalytic domain to maintain the stability of microbial HSLs. Here, we isolated an HSL esterase, E40, from a marine sedimental metagenomic library. E40 exhibited the maximal activity at 45 °C and was quite thermolabile, with a half-life of only 2 min at 40 °C, which may be an adaptation of E40 to the permanently cold sediment environment. The structure of E40 was solved to study its thermolability. Structural analysis showed that E40 lacks the interdomain hydrophobic interactions between loop 1 of the CAP domain and α7 of the catalytic domain compared with its thermostable homologs. Mutational analysis showed that the introduction of hydrophobic residues Trp(202) and Phe(203) in α7 significantly improved E40 stability and that a further introduction of hydrophobic residues in loop 1 made E40 more thermostable because of the formation of interdomain hydrophobic interactions. Altogether, the results indicate that the absence of interdomain hydrophobic interactions between loop 1 and α7 leads to the thermolability of E40. In addition, a comparative analysis of the structures of E40 and other thermolabile and thermostable HSLs suggests that the interdomain hydrophobic interactions between loop 1 and α7 are a key element for the thermostability of microbial HSLs. Therefore, this study not only illustrates the structural element leading to the thermolability of E40 but also reveals a structural determinant for HSL thermostability.

  • Organizational Affiliation

    From the State Key Laboratory of Microbial Technology and the Marine Biotechnology Research Center, Shandong University, Jinan 250100, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Esterase E40
A, B, C, D, E
A, B, C, D, E, F, G, H
317environmental samplesMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.63α = 74.04
b = 76.172β = 75.15
c = 130.186γ = 72.6
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXmodel building
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-25
    Type: Initial release
  • Version 1.1: 2015-04-08
    Changes: Database references
  • Version 1.2: 2015-05-06
    Changes: Database references
  • Version 1.3: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy