Nuclear Localization of Fructose 1,6-bisphosphatase in Smooth Muscle Cells |
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Authors: | A?Gizak D?Rakus Email author" target="_blank">A?DzugajEmail author |
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Institution: | (1) Department of Animal Physiology, Institute of Zoology, Wroclaw University, Cybulskiego 30, 50-205 Wroclaw, Poland |
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Abstract: | Summary Fructose 1,6-bisphosphatase (FBPase) – a key enzyme of gluconeogenesis – for a long time was regarded to be soluble, and freely
diffused in the cytoplasm. Our recent investigation revealed however, that in skeletal muscles of mammals, FBPase is located
on both sides of the Z-line and, in cardiomyocytes, it is also present inside the cells’ nuclei. In the current paper we demonstrate
that, in smooth muscle cells, FBPase is located in the cytoplasm and the nucleus, and that the presence of the enzyme in the
nucleus is almost completely restricted to the heterochromatin area. In search for additional evidence for the nuclear localization
of FBPase and for a possible explanation of its role in the nucleus, we have analyzed the primary structures of muscle FBPases,
finding on their molecular surface a number of domains specific for proteins transported into the nucleus. |
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