Abstract
Lipid trafficking is vital for metabolite exchange and signal communications between organelles and endomembranes. Acyl-CoA-binding proteins (ACBPs) are involved in the intracellular transport, protection, and pool formation of acyl-CoA esters, which are important intermediates and regulators in lipid metabolism and cellular signaling. In this review, we highlight recent advances in our understanding of plant ACBP families from a cellular and developmental perspective. Plant ACBPs have been extensively studied in Arabidopsis thaliana (a dicot) and to a lesser extent in Oryza sativa (a monocot). Thus far, they have been detected in the plasma membrane, vesicles, endoplasmic reticulum, Golgi apparatus, apoplast, cytosol, nuclear periphery, and peroxisomes. In combination with biochemical and molecular genetic tools, the widespread subcellular distribution of respective ACBP members has been explicitly linked to their functions in lipid metabolism during development and in response to stresses. At the cellular level, strong expression of specific ACBP homologs in specialized cells, such as embryos, stem epidermis, guard cells, male gametophytes, and phloem sap, is of relevance to their corresponding distinct roles in organ development and stress responses. Other interesting patterns in their subcellular localization and spatial expression that prompt new directions in future investigations are discussed.

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Acknowledgments
MLC is grateful to the Wilson and Amelia Wong Endowment Fund, the Research Grants Council of the Hong Kong Special Administrative Region, China (HKU765511M and HKU765813M), University Grants Committee, Hong Kong (AoE/M-05/12 and CUHK2/CRF/11G), and CRCG awards (104003169 and 104003561) from the University of Hong Kong (HKU) for supporting her work on plant ACBPs. SCL is supported by a HKU postdoctoral fellowship and CRCG award (Small Project Funding #201309176052).
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Suppl. Fig. 1
Microarray data comparing the spatiotemporal expression of AtACBPs. Microarray data from the Genevestigator database (https://genevestigator.com/; Zimmermann et al. 2004) are available for AtACBP1, AtACBP2, AtACBP4, AtACBP5 and AtACBP6. (a) Time course of the gene expression of AtACBPs at different stages of development. (b) Heat map comparing tissue-specific expression of AtACBPs. (GIF 174 kb)
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Lung, SC., Chye, ML. Deciphering the roles of acyl-CoA-binding proteins in plant cells. Protoplasma 253, 1177–1195 (2016). https://doi.org/10.1007/s00709-015-0882-6
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DOI: https://doi.org/10.1007/s00709-015-0882-6