5h48

Structural highlights

Function

[CBLN1_RAT] Required for synapse integrity and synaptic plasticity. During cerebellar synapse formation, essential for the formation and maintenance of parallel fiber and Purkinje cell synapses. When parallel fibers make contact with Purkinje spines, CBLN1 interaction with GRID2 triggers the recruitment of NRXN1 and secretory vesicles to the sites of contact. NRXN1-CBLN1-GRID2 signaling induces presynaptic morphological changes, which may further accumulate pre- and postsynaptic components to promote bidirectional maturation of parallel fiber - Purkinje cell functionally active synapses by a positive feedback mechanism. Required for CBLN3 export from the endoplasmic reticulum and secretion (By similarity). The cerebellin exerts neuromodulatory functions. Directly stimulates norepinephrine release via the adenylate cyclase/PKA-dependent signaling pathway; and indirectly enhances adrenocortical secretion in vivo, through a paracrine mechanism involving medullary catecholamine release. A conversion to [des-Ser1]-cerebellin by endopeptidases seems to be required for its autocrine-paracrine regulatory functions.^{[1] [2]}

References

1. ↑ Albertin G, Malendowicz LK, Macchi C, Markowska A, Nussdorfer GG. Cerebellin stimulates the secretory activity of the rat adrenal gland: in vitro and in vivo studies. Neuropeptides. 2000 Feb;34(1):7-11. PMID:10688962 doi:http://dx.doi.org/10.1054/npep.1999.0779
2. ↑ Rucinski M, Albertin G, Spinazzi R, Ziolkowska A, Nussdorfer GG, Malendowicz LK. Cerebellin in the rat adrenal gland: gene expression and effects of CER and [des-Ser1]CER on the secretion and growth of cultured adrenocortical cells. Int J Mol Med. 2005 Mar;15(3):411-5. PMID:15702230