ISDA

Entry Detail

PDB ID:

6S0J

Keywords:

HYDROLASE

Title:

Structure of Zika virus NS3 helicase in complex with ADP-MgF3(H2O)-

Biological Source:

Source Organism:

Zika virus (strain Mr 766)

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2019-06-16

Release Date:

2020-07-15

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.50 Å

R-Value Free:

0.18

R-Value Work:

0.14

R-Value Observed:

0.14

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Genome polyprotein
Chain IDs:A
Chain Length:451
Number of Molecules:1
Biological Source:Zika virus (strain Mr 766)

UniProt ID:A0A024B7W1 Pfam ID:PF07652, PF20907 EC:2.7.7.48

Ligand Molecules

ADP

KQB

Primary Citation

Octahedral Trifluoromagnesate, an Anomalous Metal Fluoride Species, Stabilizes the Transition State in a Biological Motor.

Ge, M, Molt Jr, R.W, Jenkins, H.T, Blackburn, G.M, Jin, Y, Antson, A.A.Show

Acs Catalysis 11 2769 2773 (2021)

PMID: 33717640 DOI: 10.1021/acscatal.0c04500

Abstact

Isoelectronic metal fluoride transition state analogue (TSA) complexes, MgF3 - and AlF4 -, have proven to be immensely useful in understanding mechanisms of biological motors utilizing phosphoryl transfer. Here we report a previously unobserved octahedral TSA complex, MgF3(H2O)-, in a 1.5 Å resolution Zika virus NS3 helicase crystal structure. 19F NMR provided independent validation and also the direct observation of conformational tightening resulting from ssRNA binding in solution. The TSA stabilizes the two conformations of motif V of the helicase that link ATP hydrolysis with mechanical work. DFT analysis further validated the MgF3(H2O)- species, indicating the significance of this TSA for studies of biological motors.

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