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Journal of Biomolecular NMR

, Volume 13, Issue 2, pp 187–191 | Cite as

Bicelle-based liquid crystals for NMR-measurement of dipolar couplings at acidic and basic pH values

  • Marcel Ottiger
  • Ad Bax
Article

Abstract

It is demonstrated that mixtures of ditetradecyl- phosphatidylcholine or didodecyl-phoshatidylcholine and dihexyl- phosphatidylcholine in water form lyotropic liquid crystalline phases under similar conditions as previously reported for bicelles consisting of dimyristoyl-phosphatidylcholine (DMPC) and dihexanoyl- phosphatidylcholine (DHPC). The carboxy-ester bonds present in DMPC and DHPC are replaced by ether linkages in their alkyl analogs, which prevents acid- or base-catalyzed hydrolysis of these compounds. 15N-1H dipolar couplings measured for ubiquitin over the 2.3–10.4pH range indicate that this protein retains a backbone conformation which is very similar to its structure at pH 6.5 over this entire range.

alignment bicelle dipolar coupling liquid crystal pH stability ubiquitin 

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Supplementary material

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Marcel Ottiger
    • 1
  • Ad Bax
    • 1
  1. 1.Laboratory of Chemical PhysicsNational Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of HealthBethesdaU.S.A.

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