4kvm image
Deposition Date 2013-05-22
Release Date 2013-07-31
Last Version Date 2024-10-30
Entry Detail
PDB ID:
4KVM
Title:
The NatA (Naa10p/Naa15p) amino-terminal acetyltransferase complex bound to a bisubstrate analog
Biological Source:
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:N-terminal acetyltransferase A complex subunit nat1
Gene (Uniprot):nat1
Chain IDs:A, B, C, D
Chain Length:734
Number of Molecules:4
Biological Source:Schizosaccharomyces pombe (strain 972 / ATCC 24843)
Polymer Type:polypeptide(L)
Molecule:N-terminal acetyltransferase A complex catalytic subunit ard1
Gene (Uniprot):ard1
Chain IDs:E, F, G, H
Chain Length:156
Number of Molecules:4
Biological Source:Schizosaccharomyces pombe (strain 972 / ATCC 24843)
Polymer Type:polypeptide(L)
Molecule:bisubstrate analog inhibitor
Chain IDs:I, J, K, L
Chain Length:4
Number of Molecules:4
Biological Source:synthetic construct
Primary Citation
Molecular basis for N-terminal acetylation by the heterodimeric NatA complex.
Nat.Struct.Mol.Biol. 20 1098 1105 (2013)
PMID: 23912279 DOI: 10.1038/nsmb.2636

Abstact

N-terminal acetylation is ubiquitous among eukaryotic proteins and controls a myriad of biological processes. Of the N-terminal acetyltransferases (NATs) that facilitate this cotranslational modification, the heterodimeric NatA complex has the most diversity for substrate selection and modifies the majority of all N-terminally acetylated proteins. Here, we report the X-ray crystal structure of the 100-kDa holo-NatA complex from Schizosaccharomyces pombe, in the absence and presence of a bisubstrate peptide-CoA-conjugate inhibitor, as well as the structure of the uncomplexed Naa10p catalytic subunit. The NatA-Naa15p auxiliary subunit contains 13 tetratricopeptide motifs and adopts a ring-like topology that wraps around the NatA-Naa10p subunit, an interaction that alters the Naa10p active site for substrate-specific acetylation. These studies have implications for understanding the mechanistic details of other NAT complexes and how regulatory subunits modulate the activity of the broader family of protein acetyltransferases.

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