Amylase-negative, asporogenous mutant of Bacillus subtilis useful as a host in a host-vector system

摘要

Biologically pure amylase-negative, asporogenous mutant B. subtilis ATCC 39,701 and amylase-negative mutant B. subtilis ATCC 39,706 are provided. The asporogenous mutant that contains no amylase-coding gene is particularly useful as a host in a host-vector system for recombinant DNA directed toward the production of improved strains of amylase-producing microorganisms.