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C3HC4-type RING finger proteins constitute a large family in the plant kingdom and play important roles in various physiological processes of plant life. In this study, a C3HC4-type zinc finger gene was isolated from  Nicotiana benthamiana . Sequence analysis indicated that the gene encodes a 24-kDa protein with 191 amino acids containing one typical C3HC4-type zinc finger domain; this gene was named  NbZFP1 . Transient expression of pGDG- NbZFP1  demonstrated that  Nb ZFP1 was localized to the chloroplast, especially in the chloroplasts of cells surrounding leaf stomata. Virus-induced gene silencing (VIGS) analysis indicated that silencing of  NbZFP1  hampered fruit development, although the height of the plants was normal. An overexpression construct was then designed and transferred into  Nicotiana benthamiana , and PCR and Southern blot showed that the  NbZFP1  gene was successfully integrated into the  Nicotiana benthamiana  genome. The transgenic lines showed typical compactness, with a short internode length and sturdy stems. This is the first report describing the function of a C3HC4-type RING finger protein in tobacco.

C3HC4-Type RING Finger Protein NbZFP1 Is Involved in Growth and Fruit Development in Nicotiana benthamiana