ISDA

Deposition Date 2004-09-24

Release Date 2004-09-30

Last Version Date 2024-11-06

Entry Detail

PDB ID:

1W8N

Keywords:

HYDROLASE

Title:

Contribution of the Active Site Aspartic Acid to Catalysis in the Bacterial Neuraminidase from Micromonospora viridifaciens.

Biological Source:

Source Organism:

MICROMONOSPORA VIRIDIFACIENS (Taxon ID: 1881)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.10 Å

R-Value Free:

0.21

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:BACTERIAL SIALIDASE
Gene (Uniprot):nedA
Mutations:YES
Chain IDs:A
Chain Length:601
Number of Molecules:1
Biological Source:MICROMONOSPORA VIRIDIFACIENS

UniProt ID:Q02834 Pfam ID:PF13088, PF10633, PF00754 EC:3.2.1.18

Ligand Molecules

DAN

GAL

Primary Citation

Contribution of the Active Site Aspartic Acid to Catalysis in the Bacterial Neuraminidase from Micromonospora Viridifaciens

Watson, J.N, Newstead, S, Dookhun, V, Taylor, G, Bennet, A.J.Show

FEBS Lett. 577 265 ? (2004)

PMID: 15527797 DOI: 10.1016/J.FEBSLET.2004.10.016

Abstact

A recombinant D92G mutant sialidase from Micromonospora viridifaciens has been cloned, expressed and purified. Kinetic studies reveal that the replacement of the conserved aspartic acid with glycine results in a catalytically competent retaining sialidase that possesses significant activity against activated substrates. The contribution of this aspartate residue to the free energy of hydrolysis for natural substrates is greater than 19 kJ/mol. The three dimensional structure of the D92G mutant shows that the removal of aspartic acid 92 causes no significant re-arrangement of the active site, and that an ordered water molecule substitutes for the carboxylate group of D92.

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Disease

Primary Citation of related structures