6IAZ

The archaeal Methanocaldococcus infernus Elp3 with N-terminus deletion (1-46)

• PDB DOI: https://doi.org/10.2210/pdb6IAZ/pdb

• Classification: TRANSFERASE
• Organism(s): Methanocaldococcus infernus
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2018-11-28 Released: 2019-02-20 
• Deposition Author(s): Lin, T.Y., Glatt, S.
• Funding Organization(s): Polish National Science Centre

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.217 
• R-Value Work: 0.195 
• R-Value Observed: 0.196 

Literature

The Elongator subunit Elp3 is a non-canonical tRNA acetyltransferase.

Lin, T.Y., Abbassi, N.E.H., Zakrzewski, K., Chramiec-Glabik, A., Jemiola-Rzeminska, M., Rozycki, J., Glatt, S.

(2019) Nat Commun 10: 625-625

• PubMed: 30733442 
• DOI: https://doi.org/10.1038/s41467-019-08579-2
• Primary Citation of Related Structures:  
  6IA6, 6IA8, 6IAD, 6IAZ


• PubMed Abstract: 
  

  The Elongator complex catalyzes posttranscriptional tRNA modifications by attaching carboxy-methyl (cm ⁵ ) moieties to uridine bases located in the wobble position. The catalytic subunit Elp3 is highly conserved and harbors two individual subdomains, a radical S-adenosyl methionine (rSAM) and a lysine acetyltransferase (KAT) domain. The details of its modification reaction cycle and particularly the substrate specificity of its KAT domain remain elusive. Here, we present the co-crystal structure of bacterial Elp3 (DmcElp3) bound to an acetyl-CoA analog and compare it to the structure of a monomeric archaeal Elp3 from Methanocaldococcus infernus (MinElp3). Furthermore, we identify crucial active site residues, confirm the importance of the extended N-terminus for substrate recognition and uncover the specific induction of acetyl-CoA hydrolysis by different tRNA species. In summary, our results establish the clinically relevant Elongator subunit as a non-canonical acetyltransferase and genuine tRNA modification enzyme.

---

Organizational Affiliation: 

Max Planck Laboratory, Malopolska Centre of Biotechnology (MCB), Jagiellonian University, Krakow, 30-387, Poland.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 57.37 kDa 
• Atom Count: 3,594 
• Modelled Residue Count: 426 
• Deposited Residue Count: 492 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone acetyltransferase, ELP3 family	A	492	Methanocaldococcus infernus	Mutation(s): 0  Gene Names: Metin_0452 EC: 2.3.1.48
UniProt
Find proteins for D5VRB9 (Methanocaldococcus infernus (strain DSM 11812 / JCM 15783 / ME)) Explore D5VRB9  Go to UniProtKB:  D5VRB9

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.217 
• R-Value Work: 0.195 
• R-Value Observed: 0.196 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.35	α = 90
b = 63.35	β = 90
c = 250.06	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2019-02-20 
Deposition Author(s): Lin, T.Y., Glatt, S.

---

Funding Organization	Location	Grant Number
	Poland	Homing/2016-2/14
Polish National Science Centre	Poland	UMO-2015/19/B/NZ1/00343
	Poland	TEAM TECH CORE FACILITY/2017-4/6

Revision History  

• Version 1.0: 2019-02-20
  Type: Initial release
  
• Version 1.1: 2024-01-24
  Changes: Data collection, Database references, Refinement description