The present invention is related to a fungal serine protease enzyme, which said enzyme has serine protease activity and comprises an amino acid sequence of Malbranchea ALKO4122 mature protease as defined in SEQ ID NO:18 or an amino acid sequence having at least 66% identity to the amino acid sequence of SEQ ID NO:18. Also disclosed is an isolated nucleic acid molecule, comprising a polynucleotide sequence which encodes a fungal serine protease enzyme, nucleic acid sequences encoding said protease, a host cell and a process of producing a polypeptide having serine protease activity. Said protease is useful as an enzyme preparation applicable in detergent compositions and for treating fibers, wool, hair, leather, or silk, for treating food or feed, or for any applications involving modification, degradation or removal of proteinaceous material.