Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T10:57:09.186Z Has data issue: false hasContentIssue false
  • English
  • Français

Quantized Diameters in Self-assembled Cyundrical Aggregates of Chlorophylls

Published online by Cambridge University Press:  21 February 2011

D. L. Worcester ,
T. J. Michalski ,
M. K. Bowman  and
J. J. Katz
D. L. Worcester
Affiliation:
Biology Division, University of Missouri, Columbia, MO 65211
T. J. Michalski
Affiliation:
Biology Division, University of Missouri, Columbia, MO 65211
M. K. Bowman
Affiliation:
Chemistry Division, Argonne National Laboratory, Argonne, IL 60439
J. J. Katz
Affiliation:
Chemistry Division, Argonne National Laboratory, Argonne, IL 60439
Get access

Abstract

Neutron small-angle scattering measurements of several different chlorophylls hydrated in deuterated octane-toluene mixtures show that long, hollow cylinders of aggregated chlorophyll are formed. Clear secondary maxima are present in the scattering, and the cylinder diameters are well determined, but depend on the type of chlorophyll. Chlorophyll-a and Bacteriochlorophyll-a were particularly studied, and several samples of each have been measured. Other chlorophylls have also been studied. The results provide strong evidence that chlorophyll cylinders are only certain sizes, with diameters very nearly in the ratio of small integers. Thus, the cylinder diameters appear to be quantized. Neutron scattering results that further test this quantization property are presented here, together with a proposal for the stereochemical features of chlorophyll aggregation which account for the diameter quantization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 174: Symposium R – Materials Synthesis Utilizing Biological Processes , 1989 , 157
Copyright
Copyright © Materials Research Society 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Worcester, D.L., Michalski, T.J. and Katz, J.J., Proc. Nat. Acad. Sci. USA 83, 3791 (1986).Google Scholar
2. Worcester, D.L., Michalski, T.J., Tyson, R.L., Bowman, M.K. and Katz, J.J., Physica B15, 502 (1989).Google Scholar
3. Bowman, M.K., Michalski, T.J., Tyson, R.L., Worcester, D.L. and Katz, J.J., Proc. Nat. Acad. Sci. USA 85 1498 (1988).Google Scholar
4. Mildner, D.F. R., Berliner, R., Pringle, O.A. and King, J.S., J. Appl. Cryst. 14, 370 (1981).Google Scholar
5. Chow, H.C., Serlin, R. and Strouse, C.E., J. Am. Chem. Soc. 97, 7230 (1975).Google Scholar
6. Kratky, C. and Dunitz, J.D., J. Mol. Biol. 113, 431 (1977).Google Scholar
7. Deisenhofer, J., Epp, O., Miki, K., Huber, R. and Michel, H., J. Mol. Biol. 180 385 (1984).Google Scholar
8. Chang, C.H., Tiede, D., Tang, J., Smith, U., Norris, J. and Schiffer, M., FEBS Lett. 205, 82 (1986).Google Scholar