NMR paper NMR with 13C, 15N-doubly-labeled DNA: the Antennapedia homeodomain complex with a 14-

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[NMR paper] NMR with 13C, 15N-doubly-labeled DNA: the Antennapedia homeodomain complex with a 14-

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11-17-2010, 11:15 PM

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NMR with 13C, 15N-doubly-labeled DNA: the Antennapedia homeodomain complex with a 14-

NMR with 13C, 15N-doubly-labeled DNA: the Antennapedia homeodomain complex with a 14-mer DNA duplex.

NMR with 13C, 15N-doubly-labeled DNA: the Antennapedia homeodomain complex with a 14-mer DNA duplex.

J Biomol NMR. 1998 Jul;12(1):25-37

Authors: Fernández C, Szyperski T, Ono A, Iwai H, Tate S, Kainosho M, Wüthrich K

Nearly complete 1H, 13C and 15N NMR assignments have been obtained for a doubly labeled 14-base pair DNA duplex in solution both in the free state and complexed with the uniformly 15N-labeled Antennapedia homeodomain. The DNA was either fully 13C, 15N-labeled or contained uniformly 13C, 15N-labeled nucleotides only at those positions which form the protein-DNA interface in the previously determined NMR solution structure of the Antennapedia homeodomain-DNA complex. The resonance assignments were obtained in three steps: (i) identification of the deoxyribose spin systems via scalar couplings using 2D and 3D HCCH-COSY and soft-relayed HCCH-COSY; (ii) sequential assignment of the nucleotides via 1H-1H NOEs observed in 3D 13C-resolved NOESY; and (iii) assignment of the imino and amino groups via 1H-1H NOEs and 15N-1H correlation spectroscopy. The assignment of the duplex in the 17 kDa protein-DNA complex was greatly facilitated by the fact that 1H signals of the protein were filtered out in 13C-resolved spectroscopy and by the excellent carbon chemical shift dispersion of the DNA duplex. Comparison of corresponding 13C chemical shifts of the free and the protein-bound DNA indicates conformational changes in the DNA upon complex formation.

PMID: 9729786 [PubMed - indexed for MEDLINE]

Source: PubMed

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