Sortase-mediated ligation (SML) of multiple peptide fragments is enabled by ligationsiteswitching. An active sorting motif installed by default into the ligation product is switched from an active to an inactive state while a latent nucleophile in the ligation product is activated for SML. Repetitive cycles of SML and ligationsiteswitching allow the assembly of multiple fragments with wild type sortase.
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.