Updated publication reference for PubMed record(s): 31242261. Leishmania are protists (class: Kinetoplastida) with a single multifunctional flagellum used for motility, attachment to the sand fly vector and sensory functions. To discover the protein composition of the L. mexicana promastigote flagellum, we fractionated L. mexicana promastigotes by mechanical shearing and differential centrifugation into four fractions: detergent soluble (Fs) and insoluble (Fi) fractions of isolated flagella and detergent soluble (Cs) and insoluble fractions (Ci) of deflagellated cell body remnants. A label-free quantitation method (SINQ; Trudgian et al., 2011, Proteomics 10.1002) was used to identify proteins enriched in each of the four fractions. This PRIDE upload contains .RAW, .MGF and .XML files, as well as the SINQ quantification output file “SINQ_raw_data” and the genome sequence annotation used for protein identification “MFiebig_20140619” (Fiebig et al., 2015, PLoS Pathogens II:e1005186). XML files are named SUB7467; MSS10859. .RAW and .MGF files are structured as follows (for each fraction there are eight files, corresponding to individual gel pieces): “Ci: C131121_030; C131121_031; C131121_032; C131121_033; C131121_034; C131121_035; C131121_036; C131121_037”, “Cs: C131121_040; C131121_041; C131121_042; C131121_043; C131121_044; C131121_045; C131121_046; C131121_047”, “Fi: C131121_010; C131121_011; C131121_012; C131121_013; C131121_014; C131121_015; C131121_016; C131121_017”, “Fs: C131121_020; C131121_021; C131121_022; C131121_023; C131121_024; C131121_025; C131121_026; C131121_027”.