The role of calmodulin for inositol 1,4,5-trisphosphate receptor function

• Published in: BBA - Proteins and Proteomics Vol. 1600; no. 1; pp. 19 - 31
• Main Authors: Nadif Kasri, Nael, Bultynck, Geert, Sienaert, Ilse, Callewaert, Geert, Erneux, Christophe, Missiaen, Ludwig, Parys, Jan B, De Smedt, Humbert
• Format: Book Review Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 04-11-2002
• Subjects: Animals; Binding Sites; Calcineurin - physiology; Calcium; Calcium - metabolism; Calcium Channels - metabolism; Calcium Signaling; Calcium-Binding Proteins - physiology; Calcium-Calmodulin-Dependent Protein Kinase Type 2; Calcium-Calmodulin-Dependent Protein Kinases - physiology; Calmodulin; Calmodulin - physiology; Inositol 1,4,5-Trisphosphate - chemistry; Inositol 1,4,5-Trisphosphate - physiology; Inositol Polyphosphate 5-Phosphatases; IP 3; IP 3 receptor; Phosphoric Monoester Hydrolases - metabolism; Phosphotransferases (Alcohol Group Acceptor) - metabolism; Protein Structure, Tertiary; Ryanodine Receptor Calcium Release Channel - chemistry; Ryanodine Receptor Calcium Release Channel - metabolism; Calcium signaling; PIP 2; W-7; Calcium; CICR; RyR; apoCaM; CaCaM; ER; IICR; CaM; IP 3R; CaBP; IP 3 receptor; IP 3; IP 4; Calmodulin; NCS
• ISSN: 1570-9639; 0006-3002; 1878-1454
• DOI: 10.1016/S1570-9639(02)00440-5

Intracellular calcium release is a fundamental signaling mechanism in all eukaryotic cells. The ryanodine receptor (RyR) and inositol 1,4,5-trisphosphate receptor (IP
3R) are intracellular calcium release channels. Both channels can be regulated by calcium and calmodulin (CaM). In this review we will first discuss the role of calcium as an activator and inactivator of the IP
3R, concluding that calcium is the most important regulator of the IP
3R. In the second part we will further focus on the role of CaM as modulator of the IP
3R, using results of the voltage-dependent Ca
2+ channels and the RyR as reference material. Here we conclude that despite the fact that different CaM-binding sites have been characterized, their function for the IP
3R remains elusive. In the third part we will discuss the possible functional role of CaM in IP
3-induced Ca
2+ release (IICR) by direct and indirect mechanisms. Special attention will be given to the Ca
2+-binding proteins (CaBPs) that were shown to activate the IP
3R in the absence of IP
3.