Synthetic Gene DataBase
 

Synthetic Gene 136


 
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Field NameNatural GeneSynthetic Gene
SGDB Gene ID125136
GenBank AccessionU36202U55763
GenBank GI10198931377914
Gene NameGFP-S65TEGFP (humanized)
Gene Length (bp)795798
SpeciesAequorea victoriaHomo sapien; Chinese hamster
Strains293T (embryonic kidney cells); CHO-K1 (ovary)
CDSatgggtaaaggagaagaacttttcactggagttgtcccaattcttgttgaattagatggt
gatgttaatgggcacaaattttctgtcagtggagagggtgaaggtgatgcaacatacgga
aaacttacccttaaatttatttgcactactggaaaactacctgttccatggccaacactt
gtcactacttttacgtatggtgttcaatgcttttcaagatacccagatcatatgaaacgg
catgactttttcaagagtgccatgcccgaaggttatgtacaggaaagaactatatttttc
aaagatgacgggaactacaagacacgtgctgaagtcaagtttgaaggtgatacccttgtt
aatagaatcgagttaaaaggtattgattttaaagaagatggaaacattcttggacacaaa
ttggaatacaactataactcacacaatgtatacatcatggcagacaaacaaaagaatgga
atcaaagttaacttcaaaattagacacaacattgaagatggaagcgttcaactagcagac
cattatcaacaaaatactccaattggcgatggccctgtccttttaccagacaaccattac
ctgtccacacaatctgccctttcgaaagatcccaacgaaaagagagaccacatggtcctt
cttgagtttgtaacagctgctgggattacacatggcatggatgaactatacaagtccgga
ctcagatctcgagctcaagcttcgaattctgcagtcgacggtaccgcgggcccgggatcc
accggatctagataa
atggtgagcaagggcgaggagctgttcaccggggtggtgcccatcctggtcgagctggac
ggcgacgtaaacggccacaagttcagcgtgtccggcgagggcgagggcgatgccacctac
ggcaagctgaccctgaagttcatctgcaccaccggcaagctgcccgtgccctggcccacc
ctcgtgaccaccctgacctacggcgtgcagtgcttcagccgctaccccgaccacatgaag
cagcacgacttcttcaagtccgccatgcccgaaggctacgtccaggagcgcaccatcttc
ttcaaggacgacggcaactacaagacccgcgccgaggtgaagttcgagggcgacaccctg
gtgaaccgcatcgagctgaagggcatcgacttcaaggaggacggcaacatcctggggcac
aagctggagtacaactacaacagccacaacgtctatatcatggccgacaagcagaagaac
ggcatcaaggtgaacttcaagatccgccacaacatcgaggacggcagcgtgcagctcgcc
gaccactaccagcagaacacccccatcggcgacggccccgtgctgctgcccgacaaccac
tacctgagcacccagtccgccctgagcaaagaccccaacgagaagcgcgatcacatggtc
ctgctggagttcgtgaccgccgccgggatcactctcggcatggacgagctgtacaagtcc
ggactcagatctcgagctcaagcttcgaattctgcagtcgacggtaccgcgggcccggga
tccaccggatctagataa
5' End
3' End
Notes35x brighter than wildtype GFP, 17x improvement over GFP-S65T
Expression VectorpS65T-C1pEGFP-C1
Assay MethodsFACS, Fluorescence microscopyFACS, Fluorescence microscopy
ResultsFluorescence was low compared to enhanced GFP versions in both FACS and microscopy assays.
Protein Functionreporter gene
Recoding PurposeTo improve expression
Synthesized ByClontech
Recoding MethodEGFP was recoded with 190 silent bp mutations, emulating preferred human codons.” Referenced Haas
1996.
Publication Author(s)Yang, T. T.; Cheng, L.; Kain, S. R.
Corresponding AuthorSteven R. Kain
Corresponding AddressCell Biology Group, CLONTECH Laboratories Inc., Palo Alto, CA 94303-4230, USA.
Publication Year1996
Publication TitleOptimized codon usage and chromophore mutations provide enhanced sensitivity with the green fluorescent protein
AbstractThe green fluorescent protein (GFP) from Aequorea victoria is a versatile reporter protein for monitoring gene expression and protein localization in a variety of cells and organisms. Despite many early successes using this reporter, wild type GFP is suboptimal for most applications due to low fluorescence intensity when excited by blue light (488 nm), a significant lag in the development of fluorescence after protein synthesis, complex photoisomerization of the GFP chromophore and poor expression in many higher eukaryotes. To improve upon these qualities, we have combined a mutant of GFP with a significantly larger extinction coefficient for excitation at 488 nm with a re-engineered GFP gene sequence containing codons preferentially found in highly expressed human proteins. The combination of improved fluorescence intensity and higher expression levels yield an enhanced GFP which provides greater sensitivity in most systems.
JournalNucleic Acids Res. 24(22): 4592-3.
SummaryA single amino acid variant was of GFP, GFP-S65T, was discovered by Heim et al which could fluoresce 5x more brightly than wild-type GFP. Later, Cormack et al put GFP through a series of aa mutations and created GFPmut1, which fluoresce even more brightly than GFP-S65T. The authors of this paper compare the fluorescence of GFP-S65T, GFPmut1, and EGFP (humanized GFPmut1) expression inside human cells. The sensitivity of the reporter gene was found to be increasingly higher with each modification. The recoding done by the authors eventually improved the fluorescence intensity of the GFP by 35x from the wild-type. Although this number may seem very high, the result comes from a combination of both amino acid modification and recoding of the base pair sequence. The respective contributions were not determined in this paper.
CommentsRecoding methods are not described in this paper. There are two references made on recoding: Chui, W et al. (1996) Curr. Biol. 6, 325-330 AND Hass, J., Park E.-C. and Seed, B. (1996) Curr. Biol. 6, 315-324
Discussion
PubMed ID8948654
Submitter NameZheng, Yuanpu
Submitter AddressUMBC
Entry ConfirmationNo
 
 

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