| Modification Notes |
Ankyrins are membrane adaptor molecules that play important roles in coupling integral membrane proteins to the spectrin-based cytoskeleton network. Mutations of ankyrin genes lead to severe genetic diseases, such as fatal cardiac arrhythmias and hereditary spherocytosis. ANKRD28 (Ankyrin repeat domain-containing protein 28), also known as PITK, is a 1,086 amino acid protein that localizes to the nucleus and contains 27 ankyrin repeats. Expressed in a variety of tissues, two isoforms of ANKRD28 exist due to alternative splicing events. ANKRD44 (ankyrin repeat domain 44), also known as PP6-ARS-B (serine/threonine-protein phosphatase 6 regulatory ankyrin repeat subunit B), is a 993 amino acid protein that contains twenty-eight ANK repeats and exists as five alternatively spliced isoforms. ANKRD44 is conserved in chimpanzee, dog, mouse, rat, chicken, zebrafish and Magnaporthe grisea. ANKRD52 (ankyrin repeat domain 52), also known as PP6-ARS-C (serine/threonine-protein phosphatase 6 regulatory ankyrin repeat subunit C), is a 1,076 amino acid phosphoprotein that contains twenty-eight ANK repeats. ANKRD52 is conserved in chimpanzee, dog, cow, mouse, rat, chicken and zebrafish. ANKRD28/44/52 are putative regulatory subunits of protein phospatase 6 (PP6), a holoenzyme that may be a heterotrimeric complex formed by a catalytic subunit, a SKAP55 domain-containing subunit (PP6R) and an ankyrin repeat-domain containing regulatory subunit (ARS). ANKRD28/44/52 may also be involved in phosphoprotein substrate recognition. |