Brain-type creatine kinase BB-CK interacts with the Golgi Matrix Protein GM130 in early prophase - PubMed

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• PMID: 17036164
• DOI: 10.1007/s11010-006-9322-4

Brain-type creatine kinase BB-CK interacts with the Golgi Matrix Protein GM130 in early prophase

Tanja S Bürklen et al. Mol Cell Biochem. 2007 Mar.

Abstract

Creatine kinase (CK) isoenzymes are essential for storing, buffering and intracellular transport of "energy-rich" phosphate compounds in tissues with fluctuating high energy demand such as muscle, brain and other tissues and cells where CK is expressed. In brain and many non-muscle cells, ubiquitous cytosolic "brain-type" BB-CK and ubiquitous mitochondrial CK (uMtCK) act as components of a phosphocreatine shuttle to maintain cellular energy pools and distribute energy flux. To date, still relatively little is known about direct coupling of functional dimeric BB-CK with other partner proteins or enzymes that are important for cell function. Using a global yeast two-hybrid (Y2H) screen with monomeric B-CK as bait and a representative brain cDNA library to search for interaction partners of B-CK with proteins of the brain, we repeatedly identified the cis-Golgi Matrix protein (GM130) as recurrent interacting partner of B-CK. Since HeLa cells also express both BB-CK and GM130, we subsequently used this cellular model system to verify and characterize the BB-CK-GM130 complex by GST-pulldown experiments, as well as by in vivo co-localization studies with confocal microscopy. Using dividing HeLa cells, we report here for the first time that GM130 and BB-CK co-localize specifically in a transient fashion during early prophase of mitosis, when GM130 plays an important role in Golgi fragmentation that starts also at early prophase. These data may shed new light on BB-CK function for energy provision for Golgi-fragmentation that is initiated by cell signalling cascades in the early phases of mitosis.

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