title: Proton-Detected Solid-State NMR Spectroscopy of Bone with Ultrafast Magic Angle Spinning.
abstract: While obtaining high-resolution structural details from bone is highly important to better understand its mechanical strength and the effects of aging and disease on bone ultrastructure, it has been a major challenge to do so with existing biophysical techniques. Though solid-state NMR spectroscopy has the potential to reveal the structural details of bone, it suffers from poor spectral resolution and sensitivity. Nonetheless, recent developments in magic angle spinning (MAS) NMR technology have made it possible to spin solid samples up to 110 kHz frequency. With such remarkable capabilities, (1)H-detected NMR experiments that have traditionally been challenging on rigid solids can now be implemented. Here, we report the first application of multidimensional (1)H-detected NMR measurements on bone under ultrafast MAS conditions to provide atomistic-level elucidation of the complex heterogeneous structure of bone. Our investigations demonstrate that two-dimensional (1)H/(1)H chemical shift correlation spectra for bone are obtainable using fp-RFDR (finite-pulse radio-frequency-driven dipolar recoupling) pulse sequence under ultrafast MAS. Our results infer that water exhibits distinct (1)H-(1)H dipolar coupling networks with the backbone and side-chain regions in collagen. These results show the promising potential of proton-detected ultrafast MAS NMR for monitoring structural and dynamic changes caused by mechanical loading and disease in bone.
authors.affiliation: 1] Department of Biophysics, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States [2] Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States.
authors.forename: Kamal H
authors.initials: KH
authors.lastname: Mroue
authors.affiliation: 1] JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan [2] RIKEN CLST-JEOL Collaboration Center, Tsurumi, Yokohama, Kanagawa 230-0045, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nishiyama
authors.affiliation: RIKEN CLST-JEOL Collaboration Center, Tsurumi, Yokohama, Kanagawa 230-0045, Japan.
authors.forename: Manoj
authors.initials: M
authors.lastname: Kumar Pandey
authors.affiliation: Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States.
authors.forename: Bo
authors.initials: B
authors.lastname: Gong
authors.affiliation: School of Dentistry, University of Michigan, Ann Arbor, Michigan, 48109-1078, United States.
authors.forename: Erin
authors.initials: E
authors.lastname: McNerny
authors.affiliation: School of Dentistry, University of Michigan, Ann Arbor, Michigan, 48109-1078, United States.
authors.forename: David H
authors.initials: DH
authors.lastname: Kohn
authors.affiliation: Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Morris
authors.affiliation: 1] Department of Biophysics, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States [2] Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109-1055, United States.
authors.forename: Ayyalusamy
authors.initials: A
authors.lastname: Ramamoorthy
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D002417:Cattle; D009682:Magnetic Resonance Spectroscopy; D011522:Protons
chemical_list: D011522:Protons