Ontology Term : Pfam:PF19743 ASTN1/2 EGF-like and Fn(III) domains EMBL-EBI

Description  Astrotactin-1 and 2 (ASTN1/2) are integral membrane proteins with a large C-terminal domain, extracellular for ASTN1 and endosome luminal for ASTN-2 [1,2]. They play critical roles in neurodevelopment, and ASTN-2 is also involved in the planar cell polarity pathway in hair cells. This is a domain found in the middle of the C-terminal of ASTN-1 and 2, which comprises a EGF- like domain (EGF4) and a fibronectin type III (Fn(III)) domain [1]. These subdomains are located between the MACPF and annexin- like domains. The structure of Fn(III) from ASTN2 revealed an unexpected feature which has two additional beta strands folded across the core. The junction between EGF-4 and Fn(III) domains in ASTN2 (but not in ASTN1) is thought to be an inositol triphosphate binding site [1].
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