4EGV

Crystal structure of a monomeric SCP2-thiolase like protein type 1 (STLP1) from Mycobacterium smegmatis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 

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Literature

Crystal Structure of a Monomeric Thiolase-Like Protein Type 1 (TLP1) from Mycobacterium smegmatis.

Janardan, N.Harijan, R.K.Wierenga, R.K.Murthy, M.R.N.

(2012) PLoS One 7: e41894-e41894

  • DOI: 10.1371/journal.pone.0041894
  • Primary Citation of Related Structures:  
    4EGV

  • PubMed Abstract: 
  • An analysis of the Mycobacterium smegmatis genome suggests that it codes for several thiolases and thiolase-like proteins. Thiolases are an important family of enzymes that are involved in fatty acid metabolism. They occur as either dimers or tetramers. Thiolases catalyze the Claisen condensation of two acetyl-Coenzyme A molecules in the synthetic direction and the thiolytic cleavage of 3-ketoacyl-Coenzyme A molecules in the degradative direction ...

    An analysis of the Mycobacterium smegmatis genome suggests that it codes for several thiolases and thiolase-like proteins. Thiolases are an important family of enzymes that are involved in fatty acid metabolism. They occur as either dimers or tetramers. Thiolases catalyze the Claisen condensation of two acetyl-Coenzyme A molecules in the synthetic direction and the thiolytic cleavage of 3-ketoacyl-Coenzyme A molecules in the degradative direction. Some of the M. smegmatis genes have been annotated as thiolases of the poorly characterized SCP2-thiolase subfamily. The mammalian SCP2-thiolase consists of an N-terminal thiolase domain followed by an additional C-terminal domain called sterol carrier protein-2 or SCP2. The M. smegmatis protein selected in the present study, referred to here as the thiolase-like protein type 1 (MsTLP1), has been biochemically and structurally characterized. Unlike classical thiolases, MsTLP1 is a monomer in solution. Its structure has been determined at 2.7 Å resolution by the single wavelength anomalous dispersion method. The structure of the protomer confirms that the N-terminal domain has the thiolase fold. An extra C-terminal domain is indeed observed. Interestingly, it consists of six β-strands forming an anti-parallel β-barrel which is completely different from the expected SCP2-fold. Detailed sequence and structural comparisons with thiolases show that the residues known to be essential for catalysis are not conserved in MsTLP1. Consistent with this observation, activity measurements show that MsTLP1 does not catalyze the thiolase reaction. This is the first structural report of a monomeric thiolase-like protein from any organism. These studies show that MsTLP1 belongs to a new group of thiolase related proteins of unknown function.


    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, Karnataka, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetyl-CoA acetyltransferaseA, B, C, D, E, F520Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: MSMEG_5521
Find proteins for A0R3M0 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0R3M0 
Go to UniProtKB:  A0R3M0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D, E, FL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.308α = 116.46
b = 102.004β = 101.28
c = 102.423γ = 97.44
Software Package:
Software NamePurpose
MAR345dtbdata collection
SHELXDphasing
REFMACrefinement
DENZOdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Data collection, Database references, Derived calculations