Automated Maskless Photolithography System for Peptide Microarray Synthesis on a Chip
作者:Dong-Sik Shin、Kook-Nyung Lee、Byung-Wook Yoo、Jaehi Kim、Mira Kim、Yong-Kweon Kim、Yoon-Sik Lee
DOI:10.1021/cc100009g
日期:2010.7.12
Maskless photolithographic peptide synthesis was performed on a glass chip using an automated peptide array synthesizer system. The peptide array synthesizer was built in a closed box, which contained optical and fluidic systems. The conditions for peptide synthesis were fully controlled by a computer program. For the peptide synthesis on a glass chip, 20 NVOC-protected amino acids were synthesized. The coupling efficiencies of two model peptide sequences were examined on ACA/APTS and PEG/CHI/GPTS chips. PEG/CHI/GPIS chip gave higher average stepwise yields of GIYWHHY (94%) and YIYGSFK (98%) than those of ACA/APTS chip. To quantify peptide-protein binding affinity, HPQ- or HPM-containing pentapeptides were synthesized on a PEG/CHI/GPTS chip and the binding event of Cy3 labeled-streptavidin was quantified. The peptide sequence of IQHPQ showed highest binding affinity with Cy3 labeled-streptavidin. The results demonstrated that the photolithographic peptide array synthesis method efficiently quantified the binding activities of protein-peptide interactions and it can be used for additional biological assay applications.
Preparation of Translationally Competent tRNA by Direct Chemical Acylation
作者:Noah H. Duffy、Dennis A. Dougherty
DOI:10.1021/ol101408f
日期:2010.9.3
Nonsense codon suppression for unnatural amino acid incorporation requires the preparation of a suppressor aminoacyl-tRNA. Chemical acylation strategies are general but inefficient and arduous. A recent report (J. Am. Chem. Soc. 2007, 129, 15848) showed acylation of RNA mediated by lanthanum(III) using amino acid phosphate esters. The successful implementation of this methodology to full-length suppressor tRNA is described, and it is shown that the derived aminoacyl-tRNA is translationally competent in Xenopus oocytes.
Synthesis of Pentafluorophenyl Esters of Nitroveratryloxycarbonyl-Protected Amino Acids
作者:Yoon-Sik Lee、Dong-Sik Shin
DOI:10.1055/s-0029-1218369
日期:2009.12
For efficient peptide synthesis on a glass chip, 20 kinds of pentafluorophenyl (Pfp) esters of nitroveratryloxycarbonyl (NVOC)-protected amino acids were synthesized by using Pfp trifluoroacetate. Simple purification step gave moderate to high yield. The first loading time of each amino acid on glass surface was 30-60 min. The UV cleavage of the NVOC group was completed within 10 minutes.
Sequentially Photocleavable Protecting Groups in Solid-Phase Synthesis
作者:Martin Kessler、Ralf Glatthar、Bernd Giese、Christian G. Bochet
DOI:10.1021/ol027454g
日期:2003.4.1
[reaction: see text] A sequential solid-phase peptide synthesis was developed using both photolabile linker and protectinggroups. The chromatic sequential lability between a tert-butyl ketone-derived linker (sensitive to irradiation at 305 nm) and a nitroveratryloxycarbonyl (NVOC) group (sensitive at 360 nm) was exploited to prepare Leu-Enkephalin in a 55% overall yield. This new strategy allows the