Structure of the S283Y mutant of MRDI

Experimental Data Snapshot

  • Resolution: 2.29 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 

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Structure of Mediator of RhoA-Dependent Invasion (MRDI) Explains Its Dual Function as a Metabolic Enzyme and a Mediator of Cell Invasion.

Templeton, P.D.Litman, E.S.Metzner, S.I.Ahn, N.G.Sousa, M.C.

(2013) Biochemistry 52: 5675-5684

  • DOI: https://doi.org/10.1021/bi400556e
  • Primary Citation of Related Structures:  
    4LDQ, 4LDR

  • PubMed Abstract: 

    Metastatic melanoma is among the most intractable cancers to treat; patients show resistance to therapy and limited survival time. A critical step in the development of metastatic melanoma is the acquisition of invasion and transition from thin to thick tumors on the skin, followed by invasion to lymph nodes. Prior studies have shown that metastatic melanoma is associated with dysregulation of RhoA and enhanced expression of a protein named "mediator of RhoA-dependent invasion (MRDI)". Importantly, MRDI is a "moonlighting" enzyme, with two distinct functions in melanoma cells. First, MRDI acts as a methylthioribose-1-phosphate (MTR-1-P) isomerase, catalyzing a critical step in methionine salvage. Second, MRDI promotes and is necessary for melanoma cell invasion, independent of its catalytic activity. This paper demonstrates that MtnA, a bacterial MTR-1-P isomerase, rescues the methionine salvage function of MRDI, but is unable to rescue its role in invasion. The crystal structure of MRDI was solved to a resolution of 2.5 Å to identify structural elements important for its invasion activity. This structure and its comparison with other MTR-1-P isomerases are presented, and mutations within a region separate from the MTR-1-P binding site, which interfere with invasion, are identified. Thus, structural elements in MRDI distal from the MTR-1-P catalytic site are responsible for the invasion phenotype.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO 80309-0596, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Methylthioribose-1-phosphate isomerase
A, B
369Homo sapiensMutation(s): 1 
Gene Names: MRI1MRDIUNQ6390/PRO21135
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BV20 (Homo sapiens)
Explore Q9BV20 
Go to UniProtKB:  Q9BV20
GTEx:  ENSG00000037757 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BV20
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.29 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.518α = 90
b = 115.97β = 90
c = 135.5γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2013-09-04
    Changes: Database references
  • Version 1.2: 2018-04-18
    Changes: Data collection
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references