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Volumn 275, Issue 5296, 1997, Pages 73-77

Recognition of unique carboxyl-terminal motifs by distinct PDZ domains

Author keywords

[No Author keywords available]

Indexed keywords

CELL PROTEIN; N METHYL DEXTRO ASPARTIC ACID RECEPTOR;

EID: 15644379801     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5296.73     Document Type: Article
Times cited : (1245)

References (33)
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    • note
    • A primary peptide library, KNXXXXXXXX-COOH, where X indicates all amino acids except Cys and Trp, was first used to screen peptides that bind specifically to the glutathione-S-transferase (GST)-PDZ domains. All the peptides in the library end with free carboxylate, therefore orienting all binding pockets. The peptides that bound were sequenced as a mixture, and the selectivities for amino acids at a given position were determined by comparison to the sequence of control experiments with GST alone (10). Arg was not included in the calculation because of buffer contamination during sequencing. A secondary library, KNXXXXXX(S,T,Y) XX-COOH, where the -2 position was fixed with Ser, Thr, and Tyr, was used to further define the preference of some PDZ domains.
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    • note
    • Peptide library synthesis was as described (10). Individual PDZ domains were expressed and purified as GST fusion proteins: murine hDlg PDZ-1 (186-282), PDZ-2 (281-377), PDZ-3 (428-518), and PDZ-1/2 (281-518); murine PTPbas PDZ-3 (1351-1445) and PDZ-5 (1758-1848); murine Tiam-1 PDZ; human LIN-2 PDZ (422-507); human erythroid p55 PDZ (1-164); and human AF-6 PDZ (983-1102). Glutathione beads (50 to 60 μl) saturated with GST-PDZ proteins were mixed with the peptide library (1 mg) in 300 μl of TSN buffer [40 mM triethylamine (pH 7.6), 150 mM NaCl, and 0.01% NP-40] containing bovine serum albumin (BSA, 1 mg/ml) and 1 mM dithiothreitol (DTT). After 45 min of constant shaking at 4°C, the beads were washed with TSN buffer. The peptides retained were eluted with 30% acetic acid, lyophilized, resuspended in distilled water, and sequenced on a Bio-Applied 477A sequencer.
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    • note
    • We thank M. Berne for peptide synthesis and sequencing, R. Mackinnon for structural coordinates of PSD-95-3, W. Boll and A. Nguyen for technical assistance, A. Couvillon for antibodies to GST, M. Oishi and T. Woodford-Thomas for the PTPbas cDNA, and A. Brecher for human LIN-2 PDZ. C.F. is a Lucille Markey Fellow. Supported by grants from American Cancer Society and Lucille P. Markey Charitable Trust (L.C.C.), NIH grants CA66263 and DK34989 (J.M.A, and A.S.F), Pew Scholars Program (A.C.C.), and NIH grant CA66263 (A.H.C. and S.M.M.).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.