Cohen Syndrome-associated Protein, COH1, is a Novel, Giant Golgi Matrix Protein Required for Golgi Integrity

Wenke Seifert, Jirko Kühnisch, Tanja Maritzen, Denise Horn, Volker Haucke, Hans Christian Hennies

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Loss-of-function mutations in the gene COH1, also known as VPS13B, lead to autosomal recessive Cohen syndrome. However, the cellular distribution and function of the encoded protein COH1 (3997 amino acids), which lacks functional homologies to other mammalian proteins, have remained enigmatic. We show here that COH1 is a peripheral Golgi membrane protein that strongly co-localizes with the cis-Golgi matrix protein GM130. Consistent with its subcellular localization, COH1 depletion using RNAi causes fragmentation of the Golgi ribbon into ministacks. Disruption of Golgi organization observed in fibroblasts from Cohen syndrome patients suggests that Golgi dysfunction contributes to Cohen syndrome pathology. In conclusion, our findings establish COH1 as a Golgi-associated matrix protein required for Golgi integrity.

Original languageEnglish
Pages (from-to)37665-37675
Number of pages11
JournalJournal of Biological Chemistry
Volume286
Issue number43
Early online date24 Aug 2011
DOIs
Publication statusPublished - 28 Oct 2011
Externally publishedYes

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