Ankyrin-2 (ANK2)

Plays an essential role in the localization and membrane stabilization of ion transporters and ion channels in several cell types, such as cardiomyocytes, in addition to in striated muscle tissues. In skeletal muscle, required for proper localization of both DMD and DCTN4 and for the formation and/or equilibrium of a unique subset of microtubules associated with costameres and neuromuscular junctions.

In cardiomyocytes, required for coordinated assembly of Na/Ca exchanger, SLC8A1/NCX1, Na/K ATPases ATP1A1 and ATP1A2 and inositol 1,4,5-trisphosphate (InsP3) receptors in sarcoplasmic reticulum/sarcolemma websites. Required for expression and targeting of SPTBN1 in neonatal cardiomyocytes and for the regulation of neonatal cardiomyocyte contraction speed (PubMed:12571597).