ISDA

Entry Detail

PDB ID:

5C88

Keywords:

TRANSFERASE

Title:

Crystal structure of Ard1 N-terminal acetyltransferase from Sulfolobus solfataricus in monoclinic form

Biological Source:

Source Organism:

Sulfolobus solfataricus strain P2

Host Organism:

Escherichia coli 'BL21-Gold(DE3)pLysS AG'

PDB Version:

Deposition Date:

2015-06-25

Release Date:

2016-01-13

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.49 Å

R-Value Free:

0.26

R-Value Work:

0.16

R-Value Observed:

0.17

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Uncharacterized N-acetyltransferase SSO0209
Chain IDs:A, B
Chain Length:173
Number of Molecules:2
Biological Source:Sulfolobus solfataricus strain P2

UniProt ID:Q980R9 Pfam ID:PF00583 EC:2.3.1.255

Ligand Molecules

COA

Primary Citation

Multiple Conformations of the Loop Region Confers Heat-Resistance on SsArd1, a Thermophilic NatA.

Chang, Y.Y, Hsu, C.H, Chang, Y.Y, Hsu, C.H.Show

Chembiochem 17 214 217 (2016)

PMID: 26593285 DOI: 10.1002/cbic.201500568

Abstact

Structural comparison indicates that the loop region between β3 and β4 of SsArd1 is extended relative to the corresponding region in mesophilic Nats, and forms a plastic hydrogen-bond network mainly at two serine residues. Strikingly, two single-point mutants showed ∼3 °C decrease in melting temperature, and two other variants showed ∼7 °C decrease; this correlated with significantly reduced enzymatic activity. To our knowledge, this is the first discovery of a loop region capable of remarkably improving protein thermostability. This provides a novel route to engineer heat-resistant proteins.

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Primary Citation of related structures