1IIC

Crystal Structure of Saccharomyces cerevisiae N-myristoyltransferase with Bound MyristoylCoA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structures of Saccharomyces cerevisiae N-myristoyltransferase with bound myristoylCoA and peptide provide insights about substrate recognition and catalysis.

Farazi, T.A.Waksman, G.Gordon, J.I.

(2001) Biochemistry 40: 6335-6343

  • Primary Citation of Related Structures:  1IID

  • PubMed Abstract: 
  • MyristoylCoA:protein N-myristoyltransferase (Nmt) attaches myristate to the N-terminal Gly residue of proteins involved in a variety of signal transduction cascades, and other critical cellular functions. To gain insight about the structural basis of ...

    MyristoylCoA:protein N-myristoyltransferase (Nmt) attaches myristate to the N-terminal Gly residue of proteins involved in a variety of signal transduction cascades, and other critical cellular functions. To gain insight about the structural basis of substrate recognition and catalysis, we determined the structures of a binary complex of Saccharomyces cerevisiae Nmt1p with myristoylCoA to 2.2 A resolution and of a ternary complex of Nmt1p with a nonhydrolyzable myristoylCoA analogue [S-(2-oxo)pentadecylCoA] and an octapeptide substrate (GLYASKLA) to 2.5 A resolution. The binary complex reveals how myristoylCoA alters the conformation of the enzyme to promote binding of both myristoylCoA and peptide and identifies the backbone amides of F170 and L171 as an oxyanion hole which polarizes the reactive thioester carbonyl. The ternary complex structure reveals details of the enzyme's peptide binding specificity and illuminates its mechanism of acyl transfer. The N-terminal Gly ammonium is positioned in close proximity to the C-terminal carboxylate of the protein, where it is poised to undergo the required deprotonation to an amine. In this conformation, the nucleophile is 6.3 A away from the thioester carbonyl. A catalytic mechanism is proposed whereby, once deprotonation is initiated, the N-terminal Gly amine can approximate the thioester carbonyl by rotating along Psi. This motion is facilitated by a H-bond network and leads to reaction between the glycine nitrogen nucleophile and the carbonyl. Loss of CoA from the tetrahedral intermediate may be facilitated by intramolecular H-bonding of the sulfur to the adenylamine of CoA. This affords a compact leaving group and lends a role for the observed bends in the CoA structure. The absolute requirement for Gly at the N-terminus of substrates is explained by the requirement for flexible rotation of its amine.


    Organizational Affiliation

    Departments of Molecular Biology and Pharmacology, and Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PEPTIDE N-myristoyltransferase
A, B
422Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: NMT1 (CDC72)
EC: 2.3.1.97
Find proteins for P14743 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: NMT1
Go to UniProtKB:  P14743
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MYA
Query on MYA

Download SDF File 
Download CCD File 
A, B
TETRADECANOYL-COA
MYRISTOYL-COA
C35 H62 N7 O17 P3 S
DUAFKXOFBZQTQE-GLTUGWJXDB
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.236 
  • Space Group: P 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 75.129α = 90.00
b = 97.060β = 90.00
c = 141.809γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-05-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-11-02
    Type: Non-polymer description