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We developed multifunctional fluorescent nanoparticles suitable for the nonviral delivery of negatively charged molecules like RNA. Therefore, we incorporated the recently developed branched hCT-derived carrier peptide hCT(18−32)-k7 on the surface of luminescent quantum dots (QDs). Besides detailed characterization of our QD−peptide conjugates concerning stability, toxicity, and uptake mechanism. we used them for efficient RNA delivery into different cell lines. The results of our studies indicate the involvement of more than one endocytotic uptake pathway in the internalization process. Furthermore, we could show that the QD−peptide bioconjugates exhibit no effect on cell viability and possess high stability inside living cells. The efficacy of our newly designed constructs for oligonucleotide drug delivery is highlighted by the successful intracellular transport of Cy-3 labeled RNA. Moreover, by using the …