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Ci protein, short for Cubitus interruptus, is a signaling protein related to the Hedgehog signaling pathway. In the absence of a signal to the Hedgehog signaling pathway, the Ci protein is cleaved and destroyed in proteasomes. It isn't, however, completely destroyed; part of the protein survives and acts as a repressor in the nucleus, keeping genes responsive to the Hedgehog signal silent.
Additional recommended knowledge
Degradation of Ci
The degradation of Ci protein depends on a large multiprotein complex, which contains a serine/threonine kinase of unknown function, an anchoring protein that binds to microtubules (to keep the Ci protein out of the nucleus) and an adaptor protein. When the Hedgehog signaling pathway is turned on, the Ci proteolysis is suppressed and the unprocessed CI protein enters the nucleus, where it activates the transcription of its target genes.
Categories: Cell signaling | Signal transduction | Proteins
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ci_protein". A list of authors is available in Wikipedia.|