{'fraction_non_alphanumeric': 0.02802893309222423, 'fraction_numerical': 0.007233273056057866, 'mean_word_length': 5.511764705882353, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Dimerization-based homogeneous fluorosensor proteins for the detection of specific dsDNA.

While there are many hybridization-based DNA sensors, few can detect native double-stranded DNA (dsDNA), which is most commonly found in physiological conditions. Here we made novel fluorosensor proteins comprised of a pair of two zinc fingers with an N-terminal dimerization motif and a C-terminal GFP variant to detect specific dsDNA sequence in a homogeneous solution. When a pair of purified zinc finger-GFP colour variant proteins (Zif12-eCFP, Zif12-eYFP) were mixed and added with specific dsDNA with 12 bp inverted repeat sequence, fluorescence spectra of the solution showed significant concentration-dependent enhancement of fluorescence resonance energy transfer (FRET), with the detection limit of approximately 10 nM. No significant change in FRET was observed upon addition of dsDNA with non-specific sequence, indicating dsDNA-dependent dimerization of the two proteins. This dimerization-based dsDNA sensors will have a range of applications where conventional hybridization-based assay is difficult.