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- xDNA ist eine künstliche DNA, bei der acht verschiedene Nukleinbasen verwendet werden. (de)
- xDNA (also known as expanded DNA or benzo-homologated DNA) is a size-expanded nucleotide system synthesized from the fusion of a benzene ring and one of the four natural bases: adenine, guanine, cytosine, and thymine. This size expansion produces an 8 letter alphabet which has a larger information density by a factor of 2n compared to natural DNA's (often referred to as B-DNA in literature) 4 letter alphabet. As with normal base-pairing, A pairs with xT, C pairs with xG, G pairs with xC, and T pairs with xA. The double helix is thus 2.4Å wider than a natural double helix. While similar in structure to B-DNA, xDNA has unique absorption, fluorescence, and stacking properties. Initially synthesized as an enzyme probe by Nelson J. Leonard's group, benzo-homologated adenine was the first base synthesized. Later, Eric T. Kool's group finished synthesizing the remaining three expanded bases, eventually followed by yDNA ("wide" DNA), another benzo-homologated nucleotide system, and naphtho-homologated xxDNA and yyDNA. xDNA is more stable when compared to regular DNA when subjected to higher temperature, and while entire strands of xDNA, yDNA, xxDNA and yyDNA exist, they are currently difficult to synthesize and maintain. Experiments with xDNA provide new insight into the behavior of natural B-DNA. The extended bases xA, xC, xG, and xT are naturally fluorescent, and single strands composed of only extended bases can recognize and bind to single strands of natural DNA, making them useful tools for studying biological systems. xDNA is most commonly formed with base pairs between a natural and expanded nucleobase, however x-nucleobases can also be paired together. Current research supports xDNA as a viable genetic encoding system in the near future. (en)
- xDNA是一种经过特殊修改后的DNA分子，一共有8种，原有的四种碱基，以及在原有的四种碱基上增加苯环，形成新的四种碱基：xA, xC, xG，和xT. A和xT配对，C和xG配对，G和xC配对，T和xA配对。通过这种方法，增加了DNA双链的间距，从而使DNA分子双链的氢键断裂温度提高。 研究xDNA是为了更好的了解自然DNA分子。而且，新DNA分子还自带荧光，这有助于研究DNA的突变以及其他一些生物系统。 (zh)
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| rdfs:comment
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- xDNA ist eine künstliche DNA, bei der acht verschiedene Nukleinbasen verwendet werden. (de)
- xDNA是一种经过特殊修改后的DNA分子，一共有8种，原有的四种碱基，以及在原有的四种碱基上增加苯环，形成新的四种碱基：xA, xC, xG，和xT. A和xT配对，C和xG配对，G和xC配对，T和xA配对。通过这种方法，增加了DNA双链的间距，从而使DNA分子双链的氢键断裂温度提高。 研究xDNA是为了更好的了解自然DNA分子。而且，新DNA分子还自带荧光，这有助于研究DNA的突变以及其他一些生物系统。 (zh)
- xDNA (also known as expanded DNA or benzo-homologated DNA) is a size-expanded nucleotide system synthesized from the fusion of a benzene ring and one of the four natural bases: adenine, guanine, cytosine, and thymine. This size expansion produces an 8 letter alphabet which has a larger information density by a factor of 2n compared to natural DNA's (often referred to as B-DNA in literature) 4 letter alphabet. As with normal base-pairing, A pairs with xT, C pairs with xG, G pairs with xC, and T pairs with xA. The double helix is thus 2.4Å wider than a natural double helix. While similar in structure to B-DNA, xDNA has unique absorption, fluorescence, and stacking properties. (en)
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