- Peptide (C)RTYGPLLNRMFGKDR, corresponding to amino acid residues 105-120 of mouse CaBP4 (Accession Q8VHC5). Intracellular.
- Western blot analysis of rat eye lysate:1. Anti-CaBP4 Antibody (#ACS-004), (1:200).
2. Anti-CaBP4 Antibody, preincubated with CaBP4 Blocking Peptide (#BLP-CS004).
Neuronal calcium-binding proteins (CaBP1-8) belong to a subclass of the calmodulin (CaM) superfamily and regulate in particular Ca2+ channel targets in the brain and retina1.
CaBP4 contains two globular domains (N- and C-lobe) that each contains a pair of EF- hand motifs connected by a central linker. The second EF-hand in CaBP4 lacks conserved residues in the binding loop and is predicted to not bind Ca2+. CaBP4 interacts structurally with the C-terminal region of CaV1.4 and this Ca2+-dependent interaction has been implicated in the modulation of voltage-dependent CaV1.4 activation2.
Multiple isoforms of CaBPs are localized in different neuronal cell types and perform specialized roles in signal transduction. The CaBP4 isoform regulates voltage-gated Ca2+ channels in retinal photoreceptor cells. In the eye, CaBP4 is localized at the photoreceptor synaptic terminals in rods and cones3. CaBP4 is essential for the development and maintenance of the photoreceptor synapse, likely through functional modulation of the photoreceptor Ca2+ channels, α1F L-type voltage- dependent calcium channels (CaV1.4), and neurotransmitter release4.
Mutations in both CaV1.4 and CaBP4 have been identiﬁed in patients suffering from congenital stationary night blindness type 2 (CSNB2), indicating that defects in Ca2+-dependent regulation of CaV1.4 by CaBP4 are closely associated with CSNB2. Indeed, deletion of CaBP4 in the mouse leads to a CSNB2-like phenotype5.
Species reactivity key:
Alomone Labs is pleased to offer a highly specific antibody directed against an epitope of mouse Calcium-binding protein 4. Anti-CaBP4 Antibody (#ACS-004) can be used in western blot analysis. It has been designed to recognize CaBP4 from rat, mouse and human samples.