Biotinylated liposomes can be conjugated non-covalently with (strept)avidin through either direct interaction with the protein/antibody conjugated to (strept)avidin or by coupling with other biotinylated proteins using (strept)avidin as a bridging molecule. Both avidin and (strept)avidin form strong non-covalent bond with biotin. The high resistance to breakdown makes them very useful in bioconjugate chemistry. However, (strept)avidin has replaced avidin in most bioconjugation applications due to its enhanced properties. NeutrAvidin (ThermoFisher) is a modified avidin without negative properties. It performs much better than original avidin and sometimes (strept)avidin.
In order to exploit the high-affinity interaction of biotin with (strept)avidin, a two-step “sandwich” protocol (Method A) has been developed for the preparation of targeted immunoliposomes. In this methodology, (strept)avidin is first attached to biotinylated liposomes, then a biotin-modified protein/antibody is introduced into the biotinylated (strept)avidin-labeled liposomes. This noncovalent approach is rapid, extremely versatile and applicable to numerous targeting ligands of interest with respect to in vitro and in vivo applications. Alternatively, instead of forming a (strept)avidin bridge, (strept)avidin molecule can also be covalently conjugated to antibody or ligand (Method B) and non-covalently bound to liposomes containing biotin on surface in order to form immunoliposomes.
ImmunoFluor™-Biotin is a PEGylated product. For other amine reactive (PEGylated and non-PEGyalated products) and also ImmunoFluor™ products suitable for other types conjugation methods see here.
ebiomall.com
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请具体点，把联系方式和价位都说一下好吗？
Clontech的非常好, 感觉. 效果不好可能是RNA问题, 或RTase的问题. 因为目前clontech的RTase是Takara的产品，而非原来clontech的产品，可单购。
步骤：1，RNA抽提（同RT）
2，逆转录，使用合成的oligo
3，p内参
4，使用根据已知序列设计的上游引物和提供下游引物做PCR，注意设计上游引物是退火温度与下游引物相差不大。
5，产物切胶回收，TA克隆测序
这个oligo和下游引物是我根据Takara和BD公司的manual自己设计的，经过我的使用效果很好。具体操作参照takara的3－racemanual。你先做3－race，了解熟悉下，成功后再做5－race。5－race要买试剂盒做，较为复杂！
