Involved in protein precursor import into chloroplasts. Part of the redox regulon consisting of TIC32, TIC 55 and TIC62 (PubMed:12426385). Acts as a membrane anchor of LFNR1 and LFNR2. Has a NADPH-dependent dehydrogenase activity, but only after preincubation with lipids (By similarity). Part of the Tic complex. Interacts with TIC110 and TIC55. Interacts with LFNR1 and LFNR2. Component of high molecular weight thylakoid LFNRs-containing protein complexes containing LIR1, LFNR1, LFNR2, TIC62 and TROL proteins. Shuttles between the membranes and the stroma, depending on the redox state of the plastidic NADP(+)/NADPH pool. Expressed in cotyledons and leaves, but not in roots. Expressed from day 3 of seedling development and continues throughout the development of photosynthetic tissues. No visible phenotype, but loss of membrane-bound LFNR1 or LFNR2.