Construction of a new bacterial cloning vector using a mutant green fluorescent protein as an indicator

A new bacterial cloning vector, pGreenLD, derived from the triple substitution mutated Aequorea victoria green fluorescent protein (GFP-S65A, V68L, S72A), when expressed in E. coli produced colonies which showed yellow-green colour under daylight and strong green fluorescence under long-wave ultraviolet light. It can be a useful vector for selecting foreign DNA fragment which was inserted into multiple cloning site based on the loss of the yellow-green color/green fluorescence of E. coli cells attributable to the insertional inactivation of GFP production.