The present invention is related to a fungal serine protease enzyme, which comprises an amino acid sequence of the mature Fe_RF6318 enzyme having an amino acid sequence of SEQ ID NO: 15. The serine protease is obtainable from Fusarium equiseti, more preferably from the deposited strain CBS 119568. Also disclosed are nucleic acid sequences encoding said protease, such as plasmid pALK2521 comprising the nucleotide sequence SEQ ID NO:9 deposited in E. coli RF7664 under accession number DSM 22171 and plasmid pALK2529 comprising the full-length gene SEQ ID NO: 10 deposited in E. coli RF7800 under accession number DSM 22172. Said protease is useful as an enzyme preparation applicable in detergent compositions and for treating fibers, for treating wool, for treating hair, for treating leather, for treating food or feed, or for any applications involving modification, degradation or removal of proteinaceous material.