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PNA肽核酸修饰多肽Suc-Tyr-Leu-Val-pNA|Suc-Ala-Pro-Phe-pNA 11
2022-07-27 05:31:00 【qiyueshengwu】
PNA肽核酸修饰多肽Suc-Tyr-Leu-Val-pNA|Suc-Ala-Pro-Phe-pNA 11
PNA特性
强结合力:PNA是由电中性的酰胺骨架组成,因此PNA链与DNA链之间无排斥现象,因此,PNA与DNA之间具有更强的结合力。
强特异性及灵敏性:在不存在错配的情况下,PNA/DNA结合稳定性强于DNA/DNA;在错配情况下,PNA/DNA结合稳定性弱于DNA/DNA。即便是单个碱基错配,也会造成溶解曲线的较大差异。因此,可以区分单个碱基的错配。没出现1个碱基的错配,Tm值平均降低15°C,如果2个碱基错配,则完全不能杂交,因此特异性较高。
强稳定性:PNA具有较强的化学,生物学,热力学稳定性。PNA在高温,强PH条件下,均具有较强的稳定性。并且由于PNA骨架有别于核酸以及多肽骨架,因此,核酸酶及蛋白酶均不易降解PNA。
强杂交稳定性:PNA在高盐浓度的杂交液中具有较强的稳定性,以及结合力。因此,PNA可以作为比较稳定的杂交探针应用于科学研究。在相同条件下,15个相同序列的碱基,DNA/DNA的Tm值为53.3°C,DNA/RNA的Tm值为50.6°C,PNA/DNA的Tm值达69.5°C,PNA/PNA更是达72.3°C,即与相同序列的核酸碱基序列相比,每增加1个碱基,解链温度提高1°C,提高了杂交稳定性。

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