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Ph d 12 peptide library

Manufactured by New England Biolabs
Sourced in United States

The Ph.D.-12 Peptide Library is a versatile tool for the discovery and screening of peptide-based interactions. The library consists of a diverse collection of 12-mer peptides displayed on the surface of M13 bacteriophage, providing a comprehensive representation of potential binding partners. This product is designed to facilitate the identification of novel peptide-protein or peptide-peptide interactions, enabling researchers to explore a wide range of biological applications.

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3 protocols using ph d 12 peptide library

1

Androgen Receptor and RIPK1 Modulation

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5α-Dihydrotestosterone (DHT), bicalutamide (CDX), and enzalutamide were obtained from Sigma Chemical Co. (St. Louis, MO). The Ph.D.-12 peptide library was purchased from New England Biolabs (Beverly, MA). Human cell lines (PC-3, LNCaP, CWR22R, MCF-7 and 293T) were purchased from the American Type Culture Collection (Manassas, VA). AR expression plasmids, PCMV-Flag-AR and pCMX-VP16-AR, were constructed as described previously [9 (link), 33 (link)]. RIPK1 cDNA, prepared from human MCF-7 cells, was cloned into the p3xFLAG-CMV vector (Sigma Chemical Co.). Motif mutants of the RIPK1 plasmid, p3xFLAG-mt-AxxAA, were generated using the site-directed mutagenesis kit from Stratagene (La Jolla, CA). Anti-AR (C19) and anti-RIPK1 antibodies were purchased from Santa Cruz Biotechnology (Santa Cruz, CA).
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2

Screening of Prostate Cancer Pathways

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DHT and CDX were obtained from Sigma Chemical Co. (St. Louis, MO) and HF was obtained from Schering-Plough (Kenilworth, NH). The Ph.D.-12 peptide library was purchased from New England Biolabs (Beverly, MA). The human prostate cancer cell lines, PC-3 and LNCaP, were purchased from the American Type Culture Collection (Manassas, VA). The AR expression plasmids PCMV-Flag-AR and pCMX-VP16-AR were constructed as described previously (Nishimura et al., 2003 (link); Yeh and Chang, 1996 (link)). BUD31 cDNA, prepared from human LNCaP cells, was cloned into the p3xFLAG-CMV vector (Sigma Chemical Co.). Motif-mutants of the BUD31 plasmid, p3X-FLAG-mt-AxxAA, were generated by site-directed mutagenesis using a kit obtained from Stratagene (La Jolla, CA). Peptides with the following sequences were synthesized by Genesis Biotech Inc. (Hsintien, Taiwan): Biotin-BUD31p, Biotin-KTRYI-FDLFY-KRKAY; Biotin-3-18, Biotin-NTNA-FSRLF-YPS; Biotin-C320, Biotin-SDSA-FSRLY-TRS; Transactivator of Transcription (TAT), fluorescein-GGGYGRKKRRQRRRG; TAT-BUD31p, fluorescein-TAT-KTRYI-FDLFY-KRKAY; TAT-3-18, fluorescein-TAT-NTNA-FSRLF-YPS; TAT-C320, TAT-SDSA-FSRLY-TRS; and TAT-3-14, fluorescein-TAT-DHSK-LYSLL-QSS. All peptides were dissolved in water. Anti-AR (C19) and anti-BUD31 antibodies were purchased from Santa Cruz Biotechnology (Santa Cruz, CA) and Sigma-Aldrich, respectively.
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3

Biopanning of Phage Display Library

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Target proteins (folate receptor-α, programmed death 1 and programmed death-ligand 1) were dissolved in carbonate buffer pH 9.6 and coated on polystyrene 96-well microtiter plates (Corning, Inc., NY, USA) overnight at 4 °C at a concentration of 50–150 μg/mL. The next day, each well was blocked with 250 μL 3% (w/v) non-fat milk (NFM) (Sangon Biotech Co., Ltd., Shanghai) for 2 hours at 37 °C. After washing 5 times with TBS containing 0.05% (v/v) Tween 20 (TBST), 100 μL Ph.D.-12 peptide library (New England BioLabs, Inc., USA) aliquot containing 1011 phages was added to each well and the plate was incubated for 1 hour at 37 °C. After washing 10 times with TBST and 3 times with TBS to remove the unbounded phages, the target-bound phages were eluted with 150 μL 100 mM Glycine-HCl (pH 2.2) and neutralized immediately with 9 μL 2 M Tris-HCl (pH 9.1). 5 μL of eluate was used for titering and the rest was used to infect E. coli ER2738 host strain (New England BioLabs, Inc., USA) for amplification.
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