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Volumn 265, Issue 2-3, 2007, Pages 197-212

Possible mechanisms for protecting N{single bond}Cα bonds in helical peptides from electron-capture (or transfer) dissociation

Author keywords

Alpha helix; Coulomb stabilization; Electron capture dissociation; Electron transfer dissociation; N single bond C alpha cleavage

Indexed keywords


EID: 34447579006     PISSN: 13873806     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.ijms.2007.02.001     Document Type: Article
Times cited : (42)

References (55)
  • 23
    • 34447504142 scopus 로고    scopus 로고
    • note
    • +) the positive charge may be somewhat delocalized so a computation of the Coulomb potential using the location of one atom (e.g., the N atom) to define the distance R can be expected to give only a qualitative estimate.
  • 28
    • 34447506814 scopus 로고    scopus 로고
    • note
    • -2 dependence relates to the fraction of the surface of a sphere of radius R that overlaps the OCN π* or SS σ* orbital a distance R away.
  • 29
    • 34447499273 scopus 로고    scopus 로고
    • note
    • When more than one positive site is present, one must use the sum of such factors to evaluate the Coulomb potential.
  • 30
    • 0033553175 scopus 로고    scopus 로고
    • The workers of Ref. [3j] cite the following reference in support of this claim: In this paper, a singly-charged anlog of the species shown in Fig. 1 was used and found to display extended rather than compact structure, suggesting that the doubly-charged species would also be extended because it would also have internal Coulomb repulsion between the two positive Lys sites
    • The workers of Ref. [3j] cite the following reference in support of this claim:. Hudgins R.R., and Jarrold M.F. J. Am. Chem. Soc. 121 (1999) 3494 In this paper, a singly-charged anlog of the species shown in Fig. 1 was used and found to display extended rather than compact structure, suggesting that the doubly-charged species would also be extended because it would also have internal Coulomb repulsion between the two positive Lys sites
    • (1999) J. Am. Chem. Soc. , vol.121 , pp. 3494
    • Hudgins, R.R.1    Jarrold, M.F.2
  • 31
    • 0037422352 scopus 로고    scopus 로고
    • A more recent effort aimed at using mobility measurements to probe extended and more compact structures of alanine-containing peptides is given in:
    • A more recent effort aimed at using mobility measurements to probe extended and more compact structures of alanine-containing peptides is given in:. Counterman A.E., and Clemmer D.E. J. Phys. Chem. B 107 (2003) 2111
    • (2003) J. Phys. Chem. B , vol.107 , pp. 2111
    • Counterman, A.E.1    Clemmer, D.E.2
  • 32
    • 34447558800 scopus 로고    scopus 로고
    • note
    • - methylene units. It might be that the rate of migration along peptide backbones, where both σ and π bonds occur, is significantly faster. We are in the process of considering this possibility at present.
  • 33
    • 5644303218 scopus 로고
    • -10 or smaller, essentially ruling out the TBET mechanism for the case under discussion. We note that these β parameters are not out of line with what one observes in other through-bond electron transfer processes. See, for example:
    • -10 or smaller, essentially ruling out the TBET mechanism for the case under discussion. We note that these β parameters are not out of line with what one observes in other through-bond electron transfer processes. See, for example:. McConnell H.M. J. Chem. Phys. 35 (1961) 508
    • (1961) J. Chem. Phys. , vol.35 , pp. 508
    • McConnell, H.M.1
  • 43
    • 34447522345 scopus 로고    scopus 로고
    • See Table 1 in Ref. [3e].
  • 49
    • 34447538626 scopus 로고    scopus 로고
    • note
    • In Ref. [3][3f] it was noted (for the first time to our knowledge) that the electron-attached OCN- moiety has a very high proton affinity (as high as 300 kcal mol-1), so it can abstract a proton from any protonated amino acid residue. However, to abstract a proton from the H{single bond}N backbone bond that belongs to the amino acid to which the electron-attached amino acid is hydrogen bonded requires even more than 310 kcal mol-1. For this reason, the helix-involved electron-attached OCN units remain in the NCO-⋯H{single bond}N state rather than moving to the NCO-H⋯N- state (2000).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.