The present application relates to two novel alkaline proteases (SEQ ID NO. 4 and 7) which are similar to one another, whose DNA was obtained from soil samples, and which were C-terminally deleted. The present application also provides proteolytically active fragments thereof (SEQ ID NO. 5 and 8), all alkaline proteases similar at least to 90% to SEQ ID NO. 4 or to 87.5% to SEQ ID NO. 7, and those which can be summarized under a consensus sequence (SEQ ID NO. 9) derived from SEQ ID NO. 4 and 7. Furthermore, the present application relates to all nucleic acids which have a homology of at least 85% identity to the associated nucleic acids (SEQ ID NO. 3 and 6) or the fragments concerned. Furthermore, the present application relates to use for these proteases and especially describes their use in detergents and cleaners.