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The chloroplast proteome represents a highly structured and functionally constrained molecular system, where protein physicochemical properties play a central role in targeting, assembly, and regulation. This cover highlights the Chloroplast Proteome Molecular Weight and Isoelectric Point Database (CP-MWpI-DB), a comprehensive resource dedicated to the systematic characterization of chloroplast proteins based on molecular weight (MW) and isoelectric point (pI). The visual concept depicts the chloroplast as a compartmentalized physicochemical landscape, where proteins are distributed according to size and charge. Distinct MW–pI clusters reflect functional protein classes associated with photosystems, ribosomes, metabolic enzymes, and protein import machinery. By integrating experimentally validated chloroplast proteins with high-confidence computational predictions across plant species, the database enables large-scale comparative analyses of proteome composition. It contains molecular weight and isoelectric point of chloroplast proteomes. CP-MWpI-DB provides standardized MW and pI calculations, and functional annotations, offering a robust framework for investigating proteome details of chloroplast. By emphasizing fundamental physicochemical parameters, the database establishes a reference atlas for understanding how protein size and charge shape chloroplast structure, function, and evolution.