Biochem Biophys Res Commun. 2001 Jun 22;284(4):1083-9.

Similar subunit interactions contribute to assembly of clathrin adaptor complexes and COPI complex: analysis using yeast three-hybrid system.

Takatsu H, Futatsumori M, Yoshino K, Yoshida Y, Shin HW, Nakayama K.

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Institute of Biological Sciences and Gene Experiment Center, University of Tsukuba, Ibaraki, Tsukuba Science City, 305-8572, Japan.

Abstract

Clathrin adaptor protein (AP) complexes are heterotetramers composed of two large, one medium, and one small subunits. By exploiting the yeast three-hybrid system, we have found that an interaction between the two large subunits of the AP-1 complex, gamma-adaptin and beta1-adaptin, is markedly enhanced in the presence of the small subunit, sigma1. Similarly, two large subunits of the AP-4 complex, epsilon-adaptin and beta4-adaptin, are found to interact with each other only in the presence of the small subunit, sigma4. Furthermore, we have found that an interaction between two large subunits of the COPI F subcomplex, gamma-COP and beta-COP, is detectable only in the presence of zeta-COP. Because these COPI subunits have common ancestral origins to the corresponding AP subunits, these three-hybrid data, taken together with the previous two-hybrid data, suggest that the AP complexes and the COPI F subcomplex assemble by virtue of similar subunit interactions.

PMID:: 11409905; [PubMed - indexed for MEDLINE]

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Cited by 7 PubMed Central articles

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Similar subunit interactions contribute to assembly of clathrin adaptor complexes and COPI complex: analysis using yeast three-hybrid system.
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