ISDA

Deposition Date 1995-10-03

Release Date 1996-04-03

Last Version Date 2024-02-07

Entry Detail

PDB ID:

1INO

Keywords:

ACID ANHYDRIDE HYDROLASE

Title:

RECOMBINANT INORGANIC PYROPHOSPHATASE FROM ESCHERICHIA COLI

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.20 Å

R-Value Observed:

0.16

Space Group:

H 3 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:INORGANIC PYROPHOSPHATASE
Gene (Uniprot):ppa
Chain IDs:A
Chain Length:175
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P0A7A9 Pfam ID:PF00719 EC:3.6.1.1

Ligand Molecules

Primary Citation

Mg2+ activation of Escherichia coli inorganic pyrophosphatase.

Avaeva, S.M, Rodina, E.V, Kurilova, S.A, Nazarova, T.I, Vorobyeva, N.N, Harutyunyan, E.H, VYu, OganessyanShow

Febs Lett. 377 44 46 (1995)

PMID: 8543015 DOI: 10.1016/0014-5793(95)01310-5

Abstact

Further refinement of X-ray data on Escherichia coli inorganic pyrophosphatase [Oganessyan et al. (1994) FEBS Lett. 348, 301-304] to 2.2 A reveals a system of noncovalent interactions involving Tyr55 and Tyr141 in the active site. The pKa for one of the eight Tyr residues in wild-type pyrophosphatase is as low as 9.1 and further decreases to 8.1 upon Mg2+ binding, generating characteristic changes in the absorption spectrum. These effects are lost in a Y55F but not in a Y141F variant. It is suggested that the lower-affinity site for Mg2+ in the enzyme is formed by Tyr55 and Asp70, which are in close proximity in the apo-enzyme structure.

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Primary Citation of related structures