Characterization of the ATP-binding domain of the sarco(endo)plasmic reticulum Ca2+-ATPase: Probing nucleotide binding by multidimensional NMR

Mona Abu-Abed, Tapas K. Mal, Masatsune Kainosho, David H. MacLennan, Mitsuhiko Ikura

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30 Scopus citations


The skeletal muscle sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA1a) mediates muscle relaxation by pumping Ca2+ from the cytosol to the ER/SR lumen. In efforts aimed at understanding the structural basis for the conformational changes accompanying the reaction cycle catalyzed by SERCA1a, we have studied the ATP-binding domain of SERCA1a in both nucleotide-bound and -free forms by NMR. Limited proteolysis analyses guided us to express a 28 kDa stably folded fragment containing the nucleotide-binding domain of SERCA1a spanning residues Thr357-Leu600. ATP binding activity was demonstrated for this fragment by a FITC competition assay. A nearly complete backbone resonance assignment of this 28 kDa ATP-binding fragment, in both the AMP-PNP-bound and -free forms, was obtained by means of heteronuclear multidimensional NMR techniques. NMR titration experiments with AMP-PNP revealed a confined nucleotide-binding site which coincides with a cytoplasmic pocket region identified in the crystal structure of apo-SERCA1a. These results are consistent with previous site-directed mutagenesis studies of SERCA1a.

Original languageEnglish (US)
Pages (from-to)1156-1164
Number of pages9
Issue number4
StatePublished - Jan 29 2002

All Science Journal Classification (ASJC) codes

  • Biochemistry


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