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• W3161125112 abstract "In neurons the Ras signaling pathway is activated by a large number of various stimuli, including trophic factors, neurotransmitters and modulatory peptides. Guanine nucleotide exchange factors (GEFs) mediate the activation of Ras GTPases, by catalyzing the exchange of GDP for GTP, and facilitate signaling networks crosstalk. In this work, very-KIND (VKIND), a new brain specific RasGEF was structurally and functionally characterized. VKIND belongs to the KIND protein family along with the non-receptor tyrosine phosphatases type 13 and Spir actin nucleation factors. The kinase non-catalytic C-lobe domain (KIND) is similar to the C-terminal protein kinase catalytic fold (C-lobe) of the p21-activated kinase (PAK). The open reading frame (ORF) of the VKIND gene of 5229 base pairs was cloned. The VKIND ORF translates into a protein of 1742 amino acids residues with a size of 191 kD. The VKIND protein structure is highly conserved among species and at present the protein is found only in Vertebratae and Echinodermatae. The arrangement of two KIND domains at its amino-terminal region, KIND1 and KIND2, is depicted in its name. The KIND module functions as a molecular interaction structure that is deprived of any enzymatic activity. While the precise occupation of the KIND1 domain remains elusive, the KIND2 domain binds to the microtubules-associated protein 2 (MAP2). The protein central portion features two clusters of high conservation of yet unknown function as well as a coiled-coil motif with a putative multiple protein-protein interaction activity. At the carboxy-terminal region VKIND features a guanine nucleotide exchange factor for Ras-like small GTPases (RasGEF) with a structural RasGEFN motif attached at its N-terminal site. The VKIND RasGEF motif is structurally related to the yeast catalytic domain CDC25. The closest relation of the VKIND RasGEF domain with an average sequence identity of 23% is assigned to the RasGEF domains of exchange factors specific for Rap GTPases with two unique insertions: the first one of 24 amino acids in the N-terminal end of the domain (between helixes αA and αB of the SOS1 RasGEF module) and the second one of 11 amino acids in the C-terminal part (between, helixes αJ and αK of the Sos1 RasGEF module). The RasGEFN domain plays a critical role in sustaining the structural and catalytical integrity of the guanidine exchange factor. VKIND is specifically and highly expressed in the murine nervous system during embryonic development and adulthood. During embryogenesis VKIND expression is present in the murine neural tube, telencephalon, retinal ganglion cells, and rhombencephalon. In the adult murine brain VKIND expression is most prominent in the cerebellum, however exclusively restricted to the granular and Purkinje cell layers. Subcellular distribution studies and time-lapse analysis revealed the gradual accumulation of VKIND into highly motile circular particles which featured estimated maximum velocity of 12 μm/min. By merging the nascent structures progressively grew to estimated 2 μm in size suggesting a role for VKIND in the vesicular transport process. Furthermore, the KIND1/KIND2 region of the VKIND protein was found to be phosphorylated by the p38 mitogen-activated protein kinase (MAPK), recently discovered to induce neurite outgrowth in response to hyperosmotic shock. In the light of VKIND negatively controlling neurite outgrowth, further elucidation of the complex Ras pathways may provide rewarding insights in the neuronal physiology." @default.
• W3161125112 created "2021-05-24" @default.
• W3161125112 creator A5059669258 @default.
• W3161125112 date "2008-01-01" @default.
• W3161125112 modified "2023-09-28" @default.
• W3161125112 title "Structure, Expression and Function of the novel KIND Domain Family Protein very-KIND" @default.
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