7S6C image
Deposition Date 2021-09-13
Release Date 2021-11-03
Last Version Date 2021-11-17
Entry Detail
PDB ID:
7S6C
Title:
CryoEM structure of modular PKS holo-Lsd14 stalled at the condensation step and bound to antibody fragment 1B2, composite structure
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.10 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:6-deoxyerythronolide-B synthase EryA2, modules 3 and 4, Lsd14 Polyketide synthase fusion
Gene (Uniprot):lsd14, eryA
Chain IDs:A, B, C, D
Chain Length:1649
Number of Molecules:4
Biological Source:Saccharopolyspora erythraea, Streptomyces lasalocidi
Polymer Type:polypeptide(L)
Molecule:Fab 1B2 heavy chain
Chain IDs:E, H
Chain Length:249
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Fab 1B2 light chain
Chain IDs:F, G
Chain Length:236
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Modular polyketide synthase contains two reaction chambers that operate asynchronously.
Science 374 723 729 (2021)
PMID: 34735234 DOI: 10.1126/science.abi8532

Abstact

Type I modular polyketide synthases are homodimeric multidomain assembly line enzymes that synthesize a variety of polyketide natural products by performing polyketide chain extension and β-keto group modification reactions. We determined the 2.4-angstrom-resolution x-ray crystal structure and the 3.1-angstrom-resolution cryo–electron microscopy structure of the Lsd14 polyketide synthase, stalled at the transacylation and condensation steps, respectively. These structures revealed how the constituent domains are positioned relative to each other, how they rearrange depending on the step in the reaction cycle, and the specific interactions formed between the domains. Like the evolutionarily related mammalian fatty acid synthase, Lsd14 contains two reaction chambers, but only one chamber in Lsd14 has the full complement of catalytic domains, indicating that only one chamber produces the polyketide product at any given time.

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Primary Citation of related structures