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FEBS Lett. 2005 Dec 5;579(29):6595-600. Epub 2005 Nov 9.

Structure of a halophilic nucleoside diphosphate kinase from Halobacterium salinarum.

Author information

  • 1Max-Planck-Institut für Biochemie, Abteilung Membranbiochemie, Am Klopferspitz 18, 82152 Martinsried, Germany. hbesir@biochem.mpg.de

Abstract

Nucleoside diphosphate kinase from the halophilic archaeon Halobacterium salinarum was crystallized in a free state and a substrate-bound form with CDP. The structures were solved to a resolution of 2.35 and 2.2A, respectively. Crystals with the apo-form were obtained with His6-tagged enzyme, whereas the untagged form was used for co-crystallization with the nucleotide. Crosslinking under different salt and pH conditions revealed a stronger oligomerization tendency for the tagged protein at low and high salt concentrations. The influence of the His6-tag on the halophilic nature of the enzyme is discussed on the basis of the observed structural properties.

PMID:
16293253
[PubMed - indexed for MEDLINE]
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