2FMN

Ala177Val mutant of E. coli Methylenetetrahydrofolate Reductase complex with LY309887


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Perturbations in the Ala -> Val Polymorphism of Methylenetetrahydrofolate Reductase: How Binding of Folates May Protect against Inactivation

Pejchal, R.Campbell, E.Guenther, B.D.Lennon, B.W.Matthews, R.G.Ludwig, M.L.

(2006) Biochemistry 45: 4808-4818

  • DOI: 10.1021/bi052294c
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In human methylenetetrahydrofolate reductase (MTHFR) the Ala222Val (677C-->T) polymorphism encodes a heat-labile gene product that is associated with elevated levels of homocysteine and possibly with risk for cardiovascular disease. Generation of the ...

    In human methylenetetrahydrofolate reductase (MTHFR) the Ala222Val (677C-->T) polymorphism encodes a heat-labile gene product that is associated with elevated levels of homocysteine and possibly with risk for cardiovascular disease. Generation of the equivalent Ala to Val mutation in Escherichia coli MTHFR, which is 30% identical to the catalytic domain of the human enzyme, creates a protein with enhanced thermolability. In both human and E. coli MTHFR, the A --> V mutation increases the rate of dissociation of FAD, and in both enzymes, loss of FAD is linked to changes in quaternary structure [Yamada, K., Chen, Z., Rozen, R., and Matthews, R. G. (2001) Proc. Natl. Acad. Sci. U.S.A. 98, 14853-14858; Guenther, B. D., Sheppard, C. A., Tran, P., Rozen, R., Matthews, R. G., and Ludwig, M. L. (1999) Nat. Struct. Biol. 6, 359-365]. Folates have been shown to protect both human and bacterial enzymes from loss of FAD. Despite its effect on affinity for FAD, the A --> V mutation is located at the bottom of the (betaalpha)(8) barrel of the catalytic domain in a position that does not contact the bound FAD prosthetic group. Here we report the structures of the Ala177Val mutant of E. coli MTHFR and of its complex with the 5,10-dideazafolate analogue, LY309887, and suggest mechanisms by which the mutation may perturb FAD binding. Helix alpha5, which immediately precedes the loop bearing the mutation, carries several residues that interact with FAD, including Asn168, Arg171, and Lys172. In the structures of the mutant enzyme this helix is displaced, perturbing protein-FAD interactions. In the complex with LY309887, the pterin-like ring of the analogue stacks against the si face of the flavin and is secured by hydrogen bonds to residues Gln183 and Asp120 that adjoin this face. The direct interactions of bound folate with the cofactor provide one mechanism for linkage between binding of FAD and folate binding that could account in part for the protective action of folates. Conformation changes induced by folate binding may also suppress dissociation of FAD.


    Organizational Affiliation

    Department of Biological Chemistry, the Biophysics Research Division, and the Life Sciences Institute, The University of Michigan, Ann Arbor, Michigan 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
5,10-methylenetetrahydrofolate reductase
A, B, C
304Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: metF
EC: 1.5.1.20
Find proteins for P0AEZ1 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEZ1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download SDF File 
Download CCD File 
A, B, C
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
4HF
Query on 4HF

Download SDF File 
Download CCD File 
A, B, C
N-[(5-{2-[(6R)-2-AMINO-4-OXO-3,4,5,6,7,8-HEXAHYDROPYRIDO[2,3-D]PYRIMIDIN-6-YL]ETHYL}-2-THIENYL)CARBONYL]-L-GLUTAMIC ACID
6R-2',5'-THIENYL-5,10-DIDEAZATETRAHYDROFOLIC ACID; LY309887
C19 H23 N5 O6 S
GQCXGHHHNACOGE-SKDRFNHKSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
4HFKi: ~20000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.217 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 101.560α = 90.00
b = 128.640β = 120.87
c = 96.744γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance