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Protein & Peptide Letters


ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Crystallization and Preliminary X-Ray Analysis of the Splice Variant of Human Ankyrin Repeat and Suppressor of Cytokine Signaling Box Protein 9 (hASB9-2)

Author(s): Xiangwei Fei, Yong Zhang, Xing Gu, Rui Qiu, Yumin Mao and Chaoneng Ji

Volume 15, Issue 6, 2008

Page: [647 - 649] Pages: 3

DOI: 10.2174/092986608784966859

Price: $65


Human ankyrin repeat and suppressor of cytokine signaling box protein 9 (hASB9), a subunit of an Elongin Ccullin- SOCS box (ECS) E3 ubiquitin ligase complex, is believed to be involved in specific substrate-recognition for ubiquitination and degradation. In fact, this specific substrate-recognition is determined by the ankyrin repeats of hASB9 protein. Here, we have cloned and overexpressed the hASB9-2, the splice variant of hASB9 with only one ankyrin repeat domain, as a 6His-tagged recombinant protein in Escherichia coli. The purified hASB9-2 protein was crystallized by the hanging-drop vapor-diffusion technique and diffracted to 2.2Å resolution. The data showed that the cubic hASB9-2 crystal belongs to space group P4332 with unit-cell parameters (a=b=c=129.25Å, α=β=γ=90°). An asymmetric unit in the crystal was assumed to contain one protein molecule giving the Matthews Coefficient factor of 2.81 and the solvent content of 56.3%.

Keywords: Hasb9, hASB9-2, ankyrin repeat, crystallization, preliminary X-ray analysis

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