Abstract:
:The huntingtin interacting protein (HIP1) is enriched in membrane-containing cell fractions and has been implicated in vesicle trafficking. It is a multidomain protein containing an N-terminal ENTH domain, a central coiled-coil forming region and a C-terminal actin-binding domain. In the present study we have identified three HIP1 associated proteins, clathrin heavy chain and alpha-adaptin A and C. In vitro binding studies revealed that the central coiled-coil domain is required for the interaction of HIP1 with clathrin, whereas DPF-like motifs located upstream to this domain are important for the binding of HIP1 to the C-terminal 'appendage' domain of alpha-adaptin A and C. Expression of full length HIP1 in mammalian cells resulted in a punctate cytoplasmic immunostaining characteristic of clathrin-coated vesicles. In contrast, when a truncated HIP1 protein containing both the DPF-like motifs and the coiled-coil domain was overexpressed, large perinuclear vesicle-like structures containing HIP1, huntingtin, clathrin and endocytosed transferrin were observed, indicating that HIP1 is an endocytic protein, the structural integrity of which is crucial for maintenance of normal vesicle size in vivo.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Waelter S,Scherzinger E,Hasenbank R,Nordhoff E,Lurz R,Goehler H,Gauss C,Sathasivam K,Bates GP,Lehrach H,Wanker EEdoi
10.1093/hmg/10.17.1807subject
Has Abstractpub_date
2001-08-15 00:00:00pages
1807-17issue
17eissn
0964-6906issn
1460-2083journal_volume
10pub_type
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