Chromatin reader component of some histone acetyltransferase (HAT) SAGA-type complexes like the TFTC-HAT, ATAC or STAGA complexes. SGF29 specifically recognizes and binds methylated 'Lys-4' of histone H3 (H3K4me), with a preference for trimethylated form (H3K4me3). In the SAGA-type complexes, SGF29 is required to recruit complexes to H3K4me. Interacts with dimethylated and trimethylated 'Lys-4' of histone H3 (H3K4me2 and H3K4me3), with a preference for the trimethylated form (H3K4me3). Component of some SAGA-type complexes. Component of the ADA2A-containing complex (ATAC). The SGF29 C-terminal (also named tudor-like) domain mediates binding to methylated 'Lys-4' of histone H3 (H3K4me). Belongs to the SGF29 family.