| Literature DB >> 19342785 |
Tatsuro Shimamura1, Yasushi Nitanai, Takuro Uchiyama, Hiroshi Matsuzawa.
Abstract
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.Entities:
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Year: 2009 PMID: 19342785 PMCID: PMC2664765 DOI: 10.1107/S1744309109008240
Source DB: PubMed Journal: Acta Crystallogr Sect F Struct Biol Cryst Commun ISSN: 1744-3091