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Volumn 134, Issue 9, 2012, Pages 3961-3964

Ligand-directed acyl imidazole chemistry for labeling of membrane-bound proteins on live cells

Author keywords

[No Author keywords available]

Indexed keywords

CELL SURFACES; DIHYDROFOLATE REDUCTASE; FOLATE RECEPTOR; IN-SITU; IN-VITRO; LIGAND BINDING; LIVE CELL; LIVING CELL; MEMBRANE-BOUND PROTEINS; NATURAL PROTEINS; PROTEIN LABELING;

EID: 84857850984     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja2108855     Document Type: Article
Times cited : (151)

References (35)
  • 30
    • 84857824070 scopus 로고    scopus 로고
    • note
    • LDAI reagent 1 was gradually hydrolyzed in aqueous solution and inactivated. The half-life of LDAI reagent 1 was determined to be 20 h at pH 6.0 by HPLC analysis (Figure S2), which may suppress the completion of DHFR labeling during the reaction time (48 h, Figure S1).
  • 31
    • 84857824072 scopus 로고    scopus 로고
    • note
    • Based on an X-ray crystal structure of the DHFR-methotrexate complex (Figure S3), Lys32 is proximal to the ligand-binding pocket of DHFR. The distance from the γ-carboxylic acid of MTX to the ε- amino group of Lys32 is 7.3 Å, roughly equal to the length between the ligand-end amide and the reaction site of LDAI reagent. Thus, it is conceivable that the proximity effect worked well for selective Lys32 labeling.
  • 33
    • 84857878179 scopus 로고    scopus 로고
    • note
    • The fluorescence signal was clearly detected even after cells were washed with FA (25 μM) (Figure S4), indicating that FR on KB cells was covalently labeled by 2.
  • 34
    • 33745204461 scopus 로고    scopus 로고
    • Dissociation constants of FR for FA and the reduced FA derivatives (H2FA and H4FA) were reported to be <1 nM and 1-10 nM, respectively Since the binding affinities for PT, MTX, and TMP were not reported, we roughly evaluated them by the competitive labeling experiment (Figure S8)
    • Dissociation constants of FR for FA and the reduced FA derivatives (H2FA and H4FA) were reported to be <1 nM and 1-10 nM, respectively (Keleman, L. E. Int. J. Cancer 2006, 119, 243) . Since the binding affinities for PT, MTX, and TMP were not reported, we roughly evaluated them by the competitive labeling experiment (Figure S8).
    • (2006) Int. J. Cancer , vol.119 , pp. 243
    • Keleman, L.E.1
  • 35
    • 84857849459 scopus 로고    scopus 로고
    • note
    • The fluorescence spectrum of Fl-labeled FR on the cell surface was almost identical with that of 1 alone in its wavelength (Figure S9).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.