6MTG

A Single Reactive Noncanonical Amino Acid is Able to Dramatically Stabilize Protein Structure

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

A Single Reactive Noncanonical Amino Acid Is Able to Dramatically Stabilize Protein Structure.

Li, J.C., Nastertorabi, F., Xuan, W., Han, G.W., Stevens, R.C., Schultz, P.G.

(2019) ACS Chem Biol 14: 1150-1153

  • DOI: 10.1021/acschembio.9b00002
  • Primary Citation of Related Structures:  
    6MTG

  • PubMed Abstract: 

    • A p-isothiocyanate phenylalanine mutant of the homodimeric protein homoserine o-succinyltransferase (MetA) was isolated in a temperature dependent selection from a library of metA mutants containing noncanonical amino acids. This mutant protein has a dramatic increase of 24 °C in thermal stability compared to the wild type protein ...

    A p-isothiocyanate phenylalanine mutant of the homodimeric protein homoserine o-succinyltransferase (MetA) was isolated in a temperature dependent selection from a library of metA mutants containing noncanonical amino acids. This mutant protein has a dramatic increase of 24 °C in thermal stability compared to the wild type protein. Peptide mapping experiments revealed that the isothiocyanate group forms a thiourea cross-link to the N terminal proline of the other monomer, despite the two positions being >30 Å apart in the X-ray crystal structure of the wild type protein. These results show that an expanded set of building blocks beyond the canonical 20 amino acids can lead to significant changes in the properties of proteins.

    Organizational Affiliation: 

    Department of Chemistry and Skaggs Institute for Chemical Biology , The Scripps Research Institute , La Jolla , California 92037 , United States.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Homoserine O-succinyltransferaseA, B302Escherichia coli K-12Mutation(s): 1 
Gene Names: metAS, metA, b4013, JW3973
EC: 2.3.1.46
UniProt
Find proteins for P07623 (Escherichia coli (strain K12))
Explore P07623 
Go to UniProtKB:  P07623
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07623
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSD
Query on CSD		A, B L-PEPTIDE LINKINGC3 H7 N O4 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.948α = 90
b = 100.036β = 90
c = 125.218γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM062159

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-26
    Type: Initial release
  • Version 1.1: 2019-07-10
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence