ISDA: 1YV7

Deposition Date 2005-02-15

Release Date 2005-03-01

Last Version Date 2024-10-09

Entry Detail

PDB ID:

1YV7

Keywords:

HYDROLASE

Title:

X-ray structure of (C87S,des103-104) onconase

Biological Source:

Source Organism(s):

Rana pipiens (Taxon ID: 8404)

Expression System(s):

Escherichia coli bl21(de3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.90 Å

R-Value Free:

0.19

R-Value Work:

0.14

R-Value Observed:

0.15

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:P-30 protein
Mutagens:C87S
Chain IDs:A
Chain Length:102
Number of Molecules:1
Biological Source:Rana pipiens

UniProt ID:P22069 Pfam ID:PF00074 EC:4.6.1.18

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
PCA	A	GLN	PYROGLUTAMIC ACID

Ligand Molecules

SO4

Primary Citation

The Importance of Dynamic Effects on the Enzyme Activity: X-RAY STRUCTURE AND MOLECULAR DYNAMICS OF ONCONASE MUTANTS

Merlino, A, Mazzarella, L, Carannante, A, Di Fiore, A, Di Donato, A, Notomista, E, Sica, F, Vitagliano, L, Merlino, A, Zagari, A, Mazzarella, L, Vitagliano, L, Merlino, A, Zagari, A, Mazzarella, L, Vitagliano, L, Adinolfi, S, Riccio, A, Sica, F, Zagari, A, Mazzarella, L, Berisio, R, Sica, F, Lamzin, V.S, Wilson, K.S, Zagari, A, Mazzarella, L.Show

J.Biol.Chem. 280 17953 17960 (2005)

PMID: 15728177 DOI: 10.1074/jbc.M501339200

Abstact

Onconase (ONC), a member of the RNase A superfamily extracted from oocytes of Rana pipiens, is an effective cancer killer. It is currently used in treatment of various forms of cancer. ONC antitumor properties depend on its ribonucleolytic activity that is low in comparison with other members of the superfamily. The most damaging side effect from Onconase treatment is renal toxicity, which seems to be caused by the unusual stability of the enzyme. Therefore, mutants with reduced thermal stability and/or increased catalytic activity may have significant implications for human cancer chemotherapy. In this context, we have determined the crystal structures of two Onconase mutants (M23L-ONC and C87S,des103-104-ONC) and performed molecular dynamic simulations of ONC and C87S,des103-104-ONC with the aim of explaining on structural grounds the modifications of the activity and thermal stability of the mutants. The results also provide the molecular bases to explain the lower catalytic activity of Onconase compared with RNase A and the unusually high thermal stability of the amphibian enzyme.

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