5XYP image
Entry Detail
PDB ID:
5XYP
Keywords:
Title:
Structure of 6-aminohexanoate-oligomer hydrolase from Arthrobacter sp. KI72., D122R mutant
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2017-07-10
Release Date:
2018-11-21
Method Details:
Experimental Method:
Resolution:
1.20 Å
R-Value Free:
0.14
R-Value Work:
0.12
R-Value Observed:
0.12
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Endo-type 6-aminohexanoate oligomer hydrolase
Mutations:D122R
Chain IDs:A, B
Chain Length:355
Number of Molecules:2
Biological Source:Flavobacterium sp. KI723T1
Primary Citation
Structural basis of the correct subunit assembly, aggregation, and intracellular degradation of nylon hydrolase
Sci Rep 8 9725 9725 (2018)
PMID: 29950566 DOI: 10.1038/s41598-018-27860-w

Abstact

Nylon hydrolase (NylC) is initially expressed as an inactive precursor (36 kDa). The precursor is cleaved autocatalytically at Asn266/Thr267 to generate an active enzyme composed of an α subunit (27 kDa) and a β subunit (9 kDa). Four αβ heterodimers (molecules A-D) form a doughnut-shaped quaternary structure. In this study, the thermostability of the parental NylC was altered by amino acid substitutions located at the A/D interface (D122G/H130Y/D36A/L137A) or the A/B interface (E263Q) and spanned a range of 47 °C. Considering structural, biophysical, and biochemical analyses, we discuss the structural basis of the stability of nylon hydrolase. From the analytical centrifugation data obtained regarding the various mutant enzymes, we conclude that the assembly of the monomeric units is dynamically altered by the mutations. Finally, we propose a model that can predict whether the fate of the nascent polypeptide will be correct subunit assembly, inappropriate protein-protein interactions causing aggregation, or intracellular degradation of the polypeptide.

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