Guide The Coronin Family of Proteins: Subcellular Biochemistry

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Since, according to sequence analysis, the protein lacks both transmembrane domains and signal peptides, we assume that it is rather localized to the cytoplasmic side of the Golgi membrane than to the luminal side or the lumen itself. Thus, phosphorylation may act as a signal controlling the membrane localization of crn7 protein.

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Several conventional coronins are also localized to the intermediates of the intracellular membrane trafficking pathways [ 11 , 18 ]. Crn7 protein may function in this way by being translocated from the cytosol to the specific domains of the Golgi membrane upon tyrosine phosphorylation.

As it was established previously, tyrosine phosphorylation does indeed act as a signal to recruit a variety of proteins to the membranes [ 20 - 22 ]. Indeed, the properties of the worm protein indicate that its function is related to the membrane transport. On the other side, in Dpod1 mutant fly embryos, the axons in the developing nervous system exhibit guidance defects; neuronal overexpression of Dpod1 is also sufficient to disrupt the guidance.

Our data are thus in good agreement with those available for other unconventional coronins. Further studies will be required to unravel the function of crn7 at the molecular level. Padmakumar is acknowledged for technical help, Dr. Francisco Rivero for helpful suggestions on the phylogenetic analysis, Dr. Iakowos Karakesisoglou and Thorsten Libotte for critically reading the manuscript.

Volume , Issue If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. If the address matches an existing account you will receive an email with instructions to retrieve your username. Open access. Short communication Free Access. Irina V. Angelika A. Noegel Corresponding Author E-mail address: noegel uni-koeln. Tools Request permission Export citation Add to favorites Track citation. Share Give access Share full text access.

Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Figure 1 Open in figure viewer PowerPoint. Figure 2 Open in figure viewer PowerPoint. Figure 3 Open in figure viewer PowerPoint. Tissue distribution of the crn7 mRNA and protein. Lane description as in A. Figure 4 Open in figure viewer PowerPoint. A — D Sections through the brain cortex at the embryonic days 5, 10, 20 and 30, respectively.

E — G Section through the hippocampus at the embryonic days 10, 20 and 30, respectively. H Localization of the crn7 protein in the Purkinje cell bodies arrows and dendrites arrowheads. I — K Embryonic skin, intestine and lens, respectively, at the day 16 of development. Top of the images A—G and I correspond to the apical side of the corresponding organs. Figure 5 Open in figure viewer PowerPoint.

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Immunolocalization of the crn7 protein in NIH 3T3 cells. C , F , I Merged false color images. Figure 6 Open in figure viewer PowerPoint. Influence of brefeldin A and colchicine on cellular distribution of crn7. C , F Merged false color images colors as in Fig.

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Figure 7 Open in figure viewer PowerPoint. C , D Analysis of tyrosine phosphorylation of the crn7 protein. One aliquot was treated with 0.

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Both aliquots were centrifuged again and the pellets and supernatants analyzed by Western blot. Citing Literature. Volume , Issue August 27, Pages Figures References Related Information. Close Figure Viewer. Browse All Figures Return to Figure. Previous Figure Next Figure.

The Coronin Family of Proteins

Email or Customer ID. Forgot password? Old Password. New Password. Password Changed Successfully Your password has been changed. Returning user. Request Username Can't sign in? In the cell, Coronin-1a serves as an auxiliary to many cytoskeletal process that involve actin. The Coronin family is composed of twelve subfamilies which include: seven subfamilies that fall under vertebrates and five subfamilies that are composed of meteozas, fungi and amoeba. The evolutionary Coronin family subfamilies have been grouped by its similarities and relationships between the different proteins.

Coronin-1a has been found in the cell cortex of macrophages, which are white blood cells, helping with a process called phagocytosis. When the cell is at rest,Coronin-1a is spread out throughout the cytoplasm and the cell cortex. Therefore, when a pathogen enters the cell, Coronin-1a binds to phagosomal membrane making sure of the binding and activation of calcinuerin, this resulting in a stop of fusion lysosomes with phagosomes.

The Coronin Family of Proteins

In other words, if Coronin-1a is removed and calcinuerin is inhibited then it allows the initiation of the fusion of phagosomes with lysosome and the killing of mycobacteria. The phylogenetic tree of the Coronin family it is quiet broad. The same way that Coronin-1a helps with the reorganization of the cytoskeleton and dynamic activity with other proteins in vertebrates, Coronin can also be seen in non-vertebrates for example the Toxoplasma gondii Coronin also known as TgCor.

Toxoplasma gondii Coronin TgCor binds to F-actin and it accelerates the actin polymerization process. It also prevents incursions and exits. As well as every other coronin, TgCor is an actin binding protein, it delocalizes to the posterior side of invading parasites and blocks them from leaving.

The structure of Coronin-1A is made out of five WD repeats, and this motifs repeat seven time forming a propeller like structures. The new ribbon visualization of the secondary structure of Coronin-1a. In model A, is the front view of Coronin-1a, the secondary structure allows you to clearly see the parallel beta sheets moving towards the bottom of the structure.

Model B, is the side view of the protein which shows the turns and the coils between the beta sheets. From this pictures we are able to see that the alpha helix and helix strands are concentrated at the bottom of the protein. Coronin-1a was input into Database of Secondary Structure Program DSSP , where the PDB database entered and a secondary structure panel is designed where one is clearly able to see the seven repeat that makes the propeller.

Also, it displays the amino acid sequence of Coronin-1a. From Wikipedia, the free encyclopedia. Chromosome 16 human [1]. Surface representation of TgCor, a thin stick visualization showing protein ligands acetate anion and 2-aminohydroxymethyl-promane-1,3-diolmade using Molegro Molecular Viewer.

Surface representation of TgCor, thin stick visualization, showing 2-aminohydroxymethyl-promane-1,3-diol made using Molegro Molecular Viewer. Surface representation of TgCor, thin stick visualization, showing acetate anion made using Molegro Molecular Viewer. Secondary structure using DSSP.

Table of contents

National Center for Biotechnology Information, U. National Library of Medicine. DNA and Cell Biology. Aging Cell. A brief history of the coronin family. Sub-Cellular Biochemistry.