Bovine pancreas is a rich source of RNase A which is often found in many commercial DNase preparations. Producing DNase I by recombinant means in an organism with much lower levels of endogenous RNase greatly facilitates purification of an enzyme with undetectable levels of RNase. The processes involved in the production ａnd isolation of recombinant DNase I are completely devoid of animal based components which eliminates the possibility of introducing animal derived pathogens into bioprocessing procedures.

Recombinant DNase I is suitable for such applications as:

• Removing genomic DNA from RNA preparations prior to RT-PCR

• Degradation of DNA templates after transcription reactions

• Removing unwanted DNA from samples prior to Northern blotting

• Removing DNA during biopharma ａnd bioprocessing procedures

Unit Definition: One Unit causes an increase in absorbance at 260nm of 0.001 per minute at 25oC when acting upon highly polymerized DNA at pH 5.0, which is the same as other Worthington DNase I products.

Note: Kunitz units as reported by other suppliers can be 2 to 4 times higher than Kunitz units as measured at Worthington. As measured at Worthington, One Kunitz unit digests 1mg of calf thymus (or pUC19 or l-phage) DNA in 10 minutes at 37oC in 50mM Tris, 1mM Mg2+, 1mM Ca2+, pH 7.8. Correlation of digestion units with Kunitz units may be different in other buffer systems.

Storage Buffer (DR1S): 5mM calcium acetate, 4mg/ml glycine, pH 5.0 ａnd 50% glycerol.

DNase I Reaction Buffer (10X): 500mM Tris-HCl, 10mM MgSO4, 1mM CaCl2, pH 7.8, provided.

艾美捷Worthington脫氧核糖核酸酶I特異性：

bpDNase I 不是堿基或序列特異性的；但是，它不會隨機切割。它顯示優(yōu)先在嘧啶的 5＇ 側(cè)進行裂解，并且在替代共聚物中尤其明顯（Bernardi 等人 1975 和 Lomonossoff 等人 1981）。已經(jīng)表明，扭曲角的變化被 DNase I 識別（Dickerson 和 Drew 1981）。DNase I 的特異性還取決于存在的二價陽離子。在存在 Ca2+ 和 Mg2+ 的情況下，它會導(dǎo)致單鏈斷裂，而在存在 Mn2+ 的情況下會導(dǎo)致雙鏈斷裂（Junowicz 和 Spencer 1973，以及 Campbell 和 Jackson 1980）。

脫氧核糖核酸酶I相關(guān)研究：

肌動蛋白

白蛋白，無核酸酶

脫氧核糖核酸酶 II

脫氧核糖核酸及相關(guān)產(chǎn)品

組蛋白

溶菌酶

核酸酶，微球菌

核酸酶，S1

磷酸酶，堿性

磷酸二酯酶 I

磷酸二酯酶 II

蛋白酶K

逆轉(zhuǎn)錄酶，重組 HIV

核糖核酸酶A

核糖核酸酶 T1

核糖核酸酶，E-Rase™ RNase 混合物

核糖核酸

來源：https://www.amyjet.com/products/WBC-LS006362.shtml