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Default The mobile loop region of the NAD(H) binding component (dI) of proton-translocating n

The mobile loop region of the NAD(H) binding component (dI) of proton-translocating nicotinamide nucleotide transhydrogenase from Rhodospirillum rubrum: complete NMR assignment and effects of bound nucleotides.

Related Articles The mobile loop region of the NAD(H) binding component (dI) of proton-translocating nicotinamide nucleotide transhydrogenase from Rhodospirillum rubrum: complete NMR assignment and effects of bound nucleotides.

Biochim Biophys Acta. 1999 Jun 30;1412(2):139-48

Authors: Quirk PG, Smith KJ, Thomas CM, Jackson JB

The dI component of transhydrogenase binds NAD+ and NADH. A mobile loop region of dI plays an important role in the nucleotide binding process, and mutations in this region result in impaired hydride transfer in the complete enzyme. We have previously employed one-dimensional 1H-NMR spectroscopy to study wild-type and mutant dI proteins of Rhodospirillum rubrum and the effects of nucleotide binding. Here, we utilise two- and three-dimensional NMR experiments to assign the signals from virtually all of the backbone and side-chain protons of the loop residues. The mobile loop region encompasses 17 residues: Asp223-Met239. The assignments also provide a much strengthened basis for interpreting the structural changes occurring upon nucleotide binding, when the loop closes down onto the surface of the protein and loses mobility. The role of the mobile loop region in catalysis is discussed with particular reference to a newly-developed model of the dI protein, based on its homology with alanine dehydrogenase.

PMID: 10393257 [PubMed - indexed for MEDLINE]



Source: PubMed
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