Sugiura M, Kisumi M
Appl Environ Microbiol. 1985 Apr;49(4):782-6. doi: 10.1128/aem.49.4.782-786.1985.
Proline-producing strains of Serratia marcescens were more osmotolerant than wild-type strains. Growth inhibition by proline analogs was significantly enhanced by increasing the osmotic stress of the medium. Mutants resistant to azetidine-2-carboxylate were derived from a proline-producing strain, SP126, under a high osmotic condition. One of the mutants, strain SP187, produced 56 mg of L-proline per ml of medium containing sucrose and urea. This amount was ca. 3 times larger than that produced by strain SP126. The intracellular glutamate content which decreased in strain SP126 was restored in strain SP187. The glutamate dehydrogenase level of strain SP187 was 5 times higher than that of strain SP126.
产脯氨酸的粘质沙雷氏菌菌株比野生型菌株具有更强的耐渗透压能力。脯氨酸类似物对生长的抑制作用会随着培养基渗透压的升高而显著增强。在高渗条件下,从产脯氨酸菌株SP126中获得了对氮杂环丁烷 -2-羧酸具有抗性的突变体。其中一个突变体SP187菌株,在含有蔗糖和尿素的培养基中每毫升可产生56毫克L-脯氨酸。这个产量约是SP126菌株产量的3倍。在SP126菌株中降低的细胞内谷氨酸含量在SP187菌株中得以恢复。SP187菌株的谷氨酸脱氢酶水平比SP126菌株高5倍。