pEYFP-ER encodes a fusion protein consisting of enhanced yellow fluorescent protein (EYFP); the endoplasmic reticulum (ER) targeting sequence of calreticulin (1), which is cloned at the 5 end; and the sequence encoding the ER retrieval sequence, KDEL (2, 3), which is cloned at the 3 end. The EYFP gene contains the four amino acid substitutions previously published as GFP-10C (4, 5): Ser- 65 to Gly; Val-68 to Leu; Ser-72 to Ala; and Thr-203 to Tyr. The fluorescence excitation maximum of EYFP is 513 nm; the emission spectrum has a peak at 527 nm (in the yellow-green region). When excited at 514 nm, the Emof EYFP is 84,500 cm–1M–1 and the fluorescence quantum yield is 0.61 ( 5), resulting in a bright fluorescent signal. The fluorescence observed is roughly equivalent to that from EGFP.In addition to the chromophore mutations, pEYFP-ER contains more than 190 silent base changes that correspond to human codon-usage preferences (6). SV40 polyadenylation signals downstream of the EYFP-ER fusion direct proper processing of the 3 end of the mRNA. The vector backbone also contains an SV40 origin for replication in mammalian cells expressing the SV40 T-antigen. A neomycin resistance cassette (Neor) consisting of the SV40 early promoter, the neomycin/ kanamycin resistance gene of Tn5, and polyadenylation signals from the herpes simplex virus thymidine kinase (HSV-TK) gene allows stably transfected eukaryotic cells to be selected using G418 (7). A bacterial promoter upstream of this cassette drives expression of the gene encoding kanamycin resistance in E. coli. The pEYFP-ER backbone also provides a pUC origin of replication for propagation in E. coli and an f1 origin for single-stranded DNA production.pEYFP-ER is designed for fluorescent labeling of the ER in mammalian cells (8, 9). Fluorescence can be observed in living cells by microscopy or flow cytometry. pEYFP-ER can be introduced into mammalian cells using any standard transfection method. If required, stable transformants can be selected using G418 (7). Filter sets are available for dual-color detection of EYFP and ECFP using conventional epifluoresence microscopy (10). Please refer to the Living Colors User Manual for additional information.
| 载体基本信息 | |||
| 载体名称 | pEYFP-ER | 载体抗性 | Kanamycin |
|---|---|---|---|
| 载体长度 | 4769 bp | 载体类型 | Fluorescent Protein Reporter Vectors |
| 筛选标记 | Neomycin | 启动子 | CMV |
| 克隆方法 | Enzyme digestion and ligation | 载体标签 | EYFP |
pEYFP-ER 载体载体图谱
pEYFP-ER 载体载体序列
LOCUS Exported 4769 bp ds-DNA circular SYN 13-JAN-2022
DEFINITION synthetic circular DNA
ACCESSION .
VERSION .
SOURCE synthetic DNA construct
ORGANISM synthetic DNA construct
REFERENCE 1 (bases 1 to 4769)
TITLE Direct Submission
FEATURES Location/Qualifiers
source 1..4769
/organism="synthetic DNA construct"
/mol_type="other DNA"
enhancer 61..364
/note="CMV enhancer"
/note="human cytomegalovirus immediate early enhancer"
promoter 365..568
/note="CMV promoter"
/note="human cytomegalovirus (CMV) immediate early
promoter"
CDS 648..1361
/codon_start=1
/product="enhanced YFP"
/note="EYFP"
/note="mammalian codon-optimized"
/translation="VSKGEELFTGVVPILVELDGDVNGHKFSVSGEGEGDATYGKLTLK
FICTTGKLPVPWPTLVTTFGYGLQCFARYPDHMKQHDFFKSAMPEGYVQERTIFFKDDG
NYKTRAEVKFEGDTLVNRIELKGIDFKEDGNILGHKLEYNYNSHNVYIMADKQKNGIKV
NFKIRHNIEDGSVQLADHYQQNTPIGDGPVLLPDNHYLSYQSALSKDPNEKRDHMVLLE
FVTAAGITLGMDELYK"
misc_feature 1377..1433
/note="MCS"
/note="multiple cloning site"
polyA_signal 1557..1678
/note="SV40 poly(A) signal"
/note="SV40 polyadenylation signal"
rep_origin complement(1685..2140)
/direction=LEFT
/note="f1 ori"
/note="f1 bacteriophage origin of replication; arrow
indicates direction of (+) strand synthesis"
promoter 2167..2271
/gene="bla"
/note="AmpR promoter"
promoter 2273..2630
/note="SV40 promoter"
/note="SV40 enhancer and early promoter"
rep_origin 2481..2616
/note="SV40 ori"
/note="SV40 origin of replication"
CDS 2665..3459
/codon_start=1
/gene="aph(3)-II (or nptII)"
/product="aminoglycoside phosphotransferase from Tn5"
/note="NeoR/KanR"
/note="confers resistance to neomycin, kanamycin, and G418
(Geneticin(R))"
/translation="MIEQDGLHAGSPAAWVERLFGYDWAQQTIGCSDAAVFRLSAQGRP
VLFVKTDLSGALNELQDEAARLSWLATTGVPCAAVLDVVTEAGRDWLLLGEVPGQDLLS
SHLAPAEKVSIMADAMRRLHTLDPATCPFDHQAKHRIERARTRMEAGLVDQDDLDEEHQ
GLAPAELFARLKASMPDGEDLVVTHGDACLPNIMVENGRFSGFIDCGRLGVADRYQDIA
LATRDIAEELGGEWADRFLVLYGIAAPDSQRIAFYRLLDEFF"
polyA_signal 3691..3738
/note="HSV TK poly(A) signal"
/note="herpes simplex virus thymidine kinase
polyadenylation signal (Cole and Stacy, 1985)"
rep_origin 4067..4655
/direction=RIGHT
/note="ori"
/note="high-copy-number ColE1/pMB1/pBR322/pUC origin of
replication"
