The function of ENSG00000118557 (PMFBP1, polyamine modulated factor 1 binding protein 1) is as follows. Required for normal spermatogenesis (PubMed:1770140, PubMed:30032984, PubMed:30298696). It functions as a scaffold protein that attaches the sperm head-tail connecting piece to the nuclear envelope, thus maintaining sperm head and tail integrity (PubMed:30032984). May also be involved in the general organization of cellular cytoskeleton (By similarity). {ECO:0000250|UniProtKB:Q9WVQ0, ECO:0000269|PubMed:1770140, ECO:0000269|PubMed:30032984, ECO:0000269|PubMed:30298696}.