carnitine shuttle See also the cellular component term 'mitochondrial inner membrane ; GO:0005743'. The transfer of acyl groups to and from acyl-CoA molecules to form O-acylcarnitine, which can exchange across the mitochondrial inner membrane with unacylated carnitine. GO:0006853 Wikipedia:Carnitine#Role_in_fatty_acid_metabolism biological_process Reactome:R-HSA-200425 long-chain fatty acid transport intracellular lipid transport fatty acid transmembrane transport mitochondrial transmembrane transport