Solid-phase synthesis method of artificial E selectin
A solid-phase synthesis and selectin technology, which is applied in the preparation methods of peptides, chemical instruments and methods, animal/human proteins, etc., to achieve the effects of short production cycle, low production cost and high yield
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[0051] Example 1E-selectin (YTHLVAIQ-NH 2 ) Preparation
[0052] (1) Raw material preparation and identification:
[0053] Rink Amide-MBHA Resin: Product NO.: HCRAm04-1-1, Lot NO.: GRMH0706, Specification: 0.42mmol / g, 100~200mesh, 1% DVB, Manufacturer: Hecheng (Tianj ing Nankai Hecheng Sci&Tech.Co .Ltd.).
[0054] Protected amino acid raw materials were purchased from Applied Biosysterms and Gill Biochemical in the United States, and these raw materials need to be identified. The identification results are shown in Table 1. The purchased raw materials meet the requirements.
[0055] Table 1 Determination results of protected amino acid raw materials
[0056]
[0057] DMF treatment: 3A molecular sieve immersion, FDNB (2,4-nitrofluorobenzene) OD≤0.15. (The DMF used below are all processed DMF).
[0058] Hexahydropyridine treatment: re-evaporate.
[0059] (2) Specific synthesis steps:
[0060] 1) Synthetic Fmoc-Q Trt -Resin:
[0061] Fmoc removal step: Weigh 5g (0.42mmol / g) of Rink Amide-MB...
Example Embodiment
[0095] Example 2E-selectin (YTHLVAIQ-NH 2 ) Preparation
[0096] The material preparation is similar to Example 1, E-selectin (YTHLVAIQ-NH 2 The preparation of) is completed on the multiplex peptide synthesizer. The peptide reaction is carried out at 30°C for 2 to 3 hours. The final yield was 67.33%.
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[0097] Example 3E-selectin (YTHLVAIQ-NH 2 ) Purification
[0098] The prepared crude peptide was subjected to column chromatography with TSK 40S (D=2.5cm, H=85cm, V=240ml), 1N HAC containing 5% acetonitrile as the eluent, flow rate 1.5ml / min, and the recovery rate was 50%. HPLC purification conditions: sample amount: 100mg, dissolved in 50% acetic acid containing 5% acetonitrile; Buffer: 1N acetic acid containing 5% acetonitrile; flow rate 1.5ml / min; detection wavelength 280nm; there are three peaks P1, P2, P3 , Collect P2, freeze-dried to obtain a soft solid. Such as figure 1 , The purity is 97%. TLC thin-plate chromatography conditions (DCM:MeOH:HAC=90:8:2) used for purification. HPLC high performance liquid chromatography, C18 column, Buffer A 0.1% TFA, Buffer B contains 0.1% TFA 100% acetonitrile, elution gradient: 0~5mins, 0% Buffer B; 5~35mins, 40%~100% Buffer B; 35~45mins, 100% Buffer B; 45~50mins, 100% buffer A.
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