Cytosolic hydroxyproline (HPRO) is transported into the mitochonrial matrix in a saturable process distinct from the one responsible for proline uptake. The carrier that mediates this process has not been identified, however (Atlante et al. 1996).
Vulpis, V, Passarella, S, Seccia, TM, Minervini, GM, Pirrelli, A, Marra, E, Atlante, A
L-hydroxyproline transmembrane transporter activity of HPRO carrier [mitochondrial inner membrane]
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