ISDA

Deposition Date 2008-08-07

Release Date 2009-07-28

Last Version Date 2023-11-01

Entry Detail

PDB ID:

2ZQ8

Keywords:

HYDROLASE

Title:

Apo structure of class a beta-lactamase Toho-1 R274N/R276N double mutant

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.03 Å

R-Value Free:

0.14

R-Value Work:

0.13

R-Value Observed:

0.13

Space Group:

P 32 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Beta-lactamase Toho-1
Gene (Uniprot):bla
Mutations:R274N, R276N
Chain IDs:A
Chain Length:262
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:Q47066 Pfam ID:PF00144, PF00905, PF13354 EC:3.5.2.6

Ligand Molecules

SO4

Primary Citation

Improvement of crystal quality by surface mutations of beta-lactamase Toho-1

Shimamura, T, Nitanai, Y, Uchiyama, T, Matsuzawa, H.Show

Acta Crystallogr.,Sect.F 65 379 382 (2009)

PMID: 19342785 DOI: 10.1107/S1744309109008240

Abstact

The beta-lactamase Toho-1 exhibits a strong tendency to form merohedrally twinned crystals. Here, the crystal quality of Toho-1 was improved by using surface modification to remove a sulfate ion involved in crystal packing. The surface-modified Toho-1 variant (R274N/R276N) was crystallized under similar conditions to those used for wild-type Toho-1. R274N/R276N did not form merohedrally twinned crystals. The crystals diffracted to a significantly higher resolution (approximately 0.97 A) than the wild-type crystals (1.65 A); they belonged to the same space group and had almost identical unit-cell parameters to those of wild-type Toho-1.

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Disease

Primary Citation of related structures