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The level of extracellular α-amylase (EC 3.2.1.1) ofBacillus subtilis Marburg was increased about fivefold by introducing theamyR marker fromB. natto 1212 through transformation.amyR2 ofB. natto 1212 has been assumed to determine a high level of α-amylase of the organism. The gene acts specifically on α-amylase synthesis but not on the production of other extracellular enzymes. α-Amylase of anamyR2 -carrying strain was found to be quite similar to that of an isogenicamyR1 -carrying strain in the thermostability and electrophoretic behavior of whichever amylase the strain produces. Marburg-type α-amylase (amyEm ) orB. natto -α-amylase (amyEn ). Anti-amylase serum titration indicates that a high level of the enzyme activity in theamyR2 -carrying strain is caused by the existence of more enzyme rather than the presence of an enzyme having higher efficiency. This is supported further by the fact thatamyR controls the synthesis of theamyE gene product in mutant M9, which synthesizes a temperature-sensitive-α-amylase, and in mutant M07, which secretes cross-reacting material. The results indicate thatamyR regulates the rate of α-amylase synthesis.

Genetic Control of the Rate of α-Amylase Synthesis in Bacillus subtilis