BART binds specifically to ARL2.GTP with a high affinity however it does not bind to ARL2.GDP. It is thought that this specific interaction is due to BART being the first identified ARL2-specific effector. The function is not completely characterised [1]. BART is predominantly cytosolic but can also be found to be associated with mitochondria. BART is also involved in binding to the adenine nucleotide transporter ANT1 [2].

1: The ARF-like 2 (ARL2)-binding protein, BART. Purification, cloning, and initial characterization. Sharer JD, Kahn RA; J Biol Chem. 1999;274:27553-27561. PMID:10488091

2: ARL2 and BART enter mitochondria and bind the adenine nucleotide transporter. Sharer JD, Shern JF, Van Valkenburgh H, Wallace DC, Kahn RA; Mol Biol Cell. 2002;13:71-83. PMID:11809823