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保護鹼基
鎖定
- 中文名
- 保護鹼基
- 因素1
- 鹼基數目
- 因素2
- 鹼基種類
- 關心項目
- 保護鹼基的數目
保護鹼基原理
在分子克隆實驗中,有時我們會在待擴增的目的基因片段兩端加上特定的酶切位點,用於後續的酶切和連接反應。由於直接暴露在末端的酶切位點不容易直接被限制性核酸內切酶切開,因此在設計PCR引物時,人為的在酶切位點序列的5‘端外側添加額外的鹼基序列,即保護鹼基,用來提高將來酶切時的活性。
其次,在分子克隆實驗中選擇載體的酶切位點時,相鄰的兩個酶切位點往往不能同時使用,因為一個位點切割後留下的鹼基過少以至於影響旁邊的酶切位點切割。
保護鹼基添加原則
添加保護鹼基,需要考慮兩個因素:一是鹼基數目,一是鹼基種類。
添加保護鹼基時,最關心的應該是保護鹼基的數目,而不是種類。什麼樣的酶切位點,添加幾個保護鹼基,是有數據可以參考的,見附表。
保護鹼基附表
Fermentas提供的保護鹼基數目和酶切活性對應值表
注:酶切活性值出現空格時參考前一格。
內切酶 | 鹼基數目和酶切活性(%) | ||||
- | 1 | 2 | 3 | 4 | 5 |
AarI | 20-50 | - | 50-100 | - | - |
AasI | 50-100 | - | - | - | - |
AatII | 0 | 0-20 | 20-50 | 50-100 | - |
Acc65I | 0-20 | 50-100 | - | - | - |
AdeI | 50-100 | - | - | - | - |
AjiI | 50-100 | - | - | - | - |
AluI | 0-20 | 20-50 | 50-100 | - | - |
Alw21I | 50-100 | - | - | - | - |
Alw26I | 50-100 | - | - | - | - |
Alw44I | 0 | 20-50 | 50-100 | - | - |
ApaI | 50-100 | - | - | - | - |
BamHI | 50-100 | - | - | - | - |
BauI | 0-20 | 20-50 | 50-100 | - | - |
BcnI | 20-50 | - | 50-100 | - | - |
BclI | 0 | 50-100 | - | - | - |
BcuI | 50-100 | - | - | - | - |
BfiI | 50-100 | - | - | - | - |
BfmI | 50-100 | - | - | - | - |
BfuI | 50-100 | - | - | - | - |
BglI | 20-50 | 50-100 | - | - | - |
BglII | 0 | 50-100 | - | - | - |
Bme1390I | 20-50 | - | 50-100 | - | - |
BoxI | 0 | 50-100 | - | - | - |
BpiI | 50-100 | - | - | - | - |
Bpu10I | 20-50 | 50-100 | - | - | - |
Bpu1102I | 50-100 | - | - | - | - |
BseDI | 0 | 50-100 | - | - | - |
BseGI | 50-100 | - | - | - | - |
BseJI | 0 | 50-100 | - | - | - |
BseLI | 0 | 50-100 | - | - | - |
BseMI | 0-20 | 50-100 | - | - | - |
BseMII | 50-100 | - | - | - | - |
BseNI | 0 | 50-100 | - | - | - |
BseSI | 50-100 | - | - | - | - |
BseXI | 20-50 | 50-100 | - | - | - |
Bsh1236I | 50-100 | - | - | - | - |
Bsh1285I | 0-20 | 50-100 | - | - | - |
BshNI | 50-100 | - | - | - | - |
BshTI | 20-50 | 50-100 | - | - | - |
Bsp68I | 0 | 50-100 | - | - | - |
Bsp119I | 50-100 | - | - | - | - |
Bsp120I | 20-50 | 50-100 | - | - | - |
Bsp143I | 50-100 | - | - | - | - |
Bsp1407I | 20-50 | 50-100 | - | - | - |
BspLI | 50-100 | - | - | - | - |
BspPI | 0 | 50-100 | - | - | - |
BspTI | 0 | 0-20 | 50-100 | - | - |
Bst1107I | 0-20 | 50-100 | - | - | - |
BstXI | 0 | - | 50-100 | - | - |
Bsu15I | 50-100 | - | - | - | - |
BsuRI | 0-20 | 20-50 | 50-100 | - | - |
BveI | 0-20 | - | 50-100 | - | - |
CaiI | 0 | 0-20 | 50-100 | - | - |
CfrI | 0 | 50-100 | - | - | - |
Cfr9I | 20-50 | 50-100 | - | - | - |
Cfr10I | 20-50 | 50-100 | - | - | - |
Cfr13I | 50-100 | - | - | - | - |
Cfr42I | 50-100 | - | - | - | - |
CpoI | 50-100 | - | - | - | - |
CseI | 50-100 | - | - | - | - |
Csp6I | 50-100 | - | - | - | - |
DpnI | 50-100 | - | - | - | - |
DraI | 0 | 0-20 | 50-100 | - | - |
Eam1104I | 0 | 50-100 | - | - | - |
Eam1105I | 0 | 50-100 | - | - | - |
Ecl136II | 50-100 | - | - | - | - |
Eco24I | 50-100 | - | - | - | - |
Eco31I | 20-50 | - | 50-100 | - | - |
Eco32I | 20-50 | 50-100 | - | - | - |
Eco47I | 50-100 | - | - | - | - |
Eco47III | 0 | 0-20 | 50-100 | - | - |
Eco52I | 0-20 | 50-100 | - | - | - |
Eco57I | 50-100 | - | - | - | - |
Eco57MI | 50-100 | - | - | - | - |
Eco72I | 0-20 | 50-100 | - | - | - |
Eco81I | 50-100 | - | - | - | - |
Eco88I | 50-100 | - | - | - | - |
Eco91I | 20-50 | 50-100 | - | - | - |
Eco105I | 20-50 | 50-100 | - | - | - |
Eco130I | 0 | - | 50-100 | - | - |
Eco147I | 0 | 50-100 | - | - | - |
EcoO109I | 50-100 | - | - | - | - |
EcoRI | 50-100 | - | - | - | - |
EcoRII | 0 | 0-20 | 20-50 | 50-100 | - |
EheI | 20-50 | - | 50-100 | - | - |
Esp3I | 50-100 | - | - | - | - |
FaqI | 0-20 | 50-100 | - | - | - |
FspAI | 0-20 | 20-50 | 50-100 | - | - |
FspBI | 20-50 | 50-100 | - | - | - |
GsuI | 50-100 | - | - | - | - |
HhaI | 50-100 | - | - | - | - |
Hin1I | 50-100 | - | - | - | - |
Hin1II | 0 | 0-20 | 50-100 | - | - |
Hin6I | 0 | - | 0-20 | 50-100 | - |
HincII | 50-100 | - | - | - | - |
HindIII | 0 | 0-20 | 50-100 | - | - |
HinfI | 50-100 | - | - | - | - |
HpaII | 0-20 | 50-100 | - | - | - |
HphI | 0 | 50-100 | - | - | - |
Hpy8I | 0-20 | 50-100 | - | - | - |
HpyF3I | 20-50 | 50-100 | - | - | - |
HpyF10VI | 50-100 | - | - | - | - |
KpnI | 50-100 | - | - | - | - |
Kpn2I | 0 | 50-100 | - | - | - |
KspAI | 20-50 | 50-100 | - | - | - |
LguI | 50-100 | - | - | - | - |
LweI | 20-50 | 50-100 | - | - | - |
MbiI | 0 | 0-20 | 50-100 | - | - |
MboI | 50-100 | - | - | - | - |
MboII | 50-100 | - | - | - | - |
MlsI | 0-20 | 50-100 | - | - | - |
MluI | 20-50 | - | 50-100 | - | - |
MnlI | 0 | 50-100 | - | - | - |
Mph1103I | 20-50 | 50-100 | - | - | - |
MspI | 0-20 | 50-100 | - | - | - |
MssI | 20-50 | 50-100 | - | - | - |
MunI | 20-50 | 50-100 | - | - | - |
MvaI | 0 | 20-50 | 50-100 | - | - |
Mva1269I | 0 | 50-100 | - | - | - |
NcoI | 0 | 50-100 | - | - | - |
NdeI* | 0-20 | 20-50 | 50-100 | - | - |
NheI | 0 | 20-50 | - | 50-100 | - |
NmuCI | 20-50 | 50-100 | - | - | - |
NotI | 20-50 | 50-100 | - | - | - |
NsbI | 0 | 0-20 | 50-100 | - | - |
OliI | 0-20 | 20-50 | 50-100 | - | - |
PaeI | 0 | 0-20 | - | 20-50 | 50-100 |
PagI | 20-50 | 50-100 | - | - | - |
PasI | 50-100 | - | - | - | - |
PauI | 0 | 50-100 | - | - | - |
PdiI | 0-20 | 50-100 | - | - | - |
PdmI | 50-100 | - | - | - | - |
PfeI | 50-100 | - | - | - | - |
Pfl23II | 0-20 | 20-50 | 50-100 | - | - |
PfoI | 0 | 20-50 | 50-100 | - | - |
Ppu21I | 50-100 | - | - | - | - |
PscI | 0 | 50-100 | - | - | - |
Psp5II | 0 | 50-100 | - | - | - |
Psp1406I | 0-20 | 50-100 | - | - | - |
PsuI | 0-20 | 50-100 | - | - | - |
PstI | 0-20 | 50-100 | - | - | - |
PsyI | 0 | 50-100 | - | - | - |
PvuI | 20-50 | - | 50-100 | - | - |
PvuII | 50-100 | - | - | - | - |
RsaI | 50-100 | - | - | - | - |
SacI | 50-100 | - | - | - | - |
SalI | 20-50 | - | 50-100 | - | - |
SatI | 0 | 50-100 | - | - | - |
ScaI | 0-20 | 50-100 | - | - | - |
SchI | 50-100 | - | - | - | - |
SdaI | 0-20 | 50-100 | - | - | - |
SduI | 50-100 | - | - | - | - |
SfiI | 50-100 | - | - | - | - |
SgsI | 50-100 | - | - | - | - |
SmaI | 50-100 | - | - | - | - |
SmiI | 0-20 | 50-100 | - | - | - |
SmoI | 0 | 50-100 | - | - | - |
SmuI | 50-100 | - | - | - | - |
SsiI | 50-100 | - | - | - | - |
SspI | 0-20 | 50-100 | - | - | - |
TaaI | 20-50 | 50-100 | - | - | - |
TaiI | 50-100 | - | - | - | - |
TaqI | 0 | 20-50 | - | 50-100 | - |
TasI | 0 | 20-50 | 50-100 | - | - |
TatI | 0-20 | - | 20-50 | 50-100 | - |
TauI | 20-50 | 50-100 | - | - | - |
Tru1I | 0 | 0-20 | - | 50-100 | - |
TsoI | 20-50 | 50-100 | - | - | - |
Van91I | 0 | 50-100 | - | - | - |
VspI | 50-100 | - | - | - | - |
XagI | 20-50 | 50-100 | - | - | - |
XapI | 20-50 | - | 50-100 | - | - |
XbaI | 20-50 | 50-100 | - | - | - |
XceI | 0 | 50-100 | - | - | - |
XhoI | 0-20 | 50-100 | - | - | - |
XmaJI | 50-100 | - | - | - | - |
XmiI | 50-100 | - | - | - | - |
I-SceI | 50-100 | - | - | - | - |
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