HIP-I: A huntingtin interacting protein isolated by the yeast two-hybrid system

作者：Erich E. Wanker, Carlos Rovira, Eberhard Scherzinger, Renate Hasenbank, Stephanie Wälter, David S. Tait, John Colicelli, Hans R. Lehrach · 发表于：Human Molecular Genetics · 年份：1997 · DOI：10.1093/hmg/6.3.487 · 被引用次数：332 · 研究领域：Genetic Neurodegenerative Diseases、Muscle Physiology and Disorders、Mitochondrial Function and Pathology

We report the discovery of the huntingtin interacting protein I (HIP-I) which binds specifically to the N-terminus of human huntingtin, both in the two-hybrid screen and in in vitro binding experiments. For the interaction in vivo, a protein region downstream of the polyglutamine stretch in huntingtin is essential. The HIP1 cDNA isolated by the two-hybrid screen encodes a 55 kDa fragment of a novel protein. Using an affinity-purified polyclonal antibody raised against recombinant HIP-I, a protein of 116 kDa was detected in brain extracts by Western blot analysis. The predicted amino acid sequence of the HIP-I fragment exhibits significant similarity to cytoskeleton proteins, suggesting that HIP-I and huntingtin play a functional role in the cell filament networks. The HIP1 gene is ubiquitously expressed in different brain regions at low level. HIP-I is enriched in human brain but can also be detected in other human tissues as well as in mouse brain. HIP-I and huntingtin behave almost identically during subcellular fractionation and both proteins are enriched in the membrane containing fractions.