. Biological structure and function; proceedings. Biochemistry; Cytology. 322 J. A. BERGERON AND R. C. FULLER which can be extrapolated to the molecular level. An application of this concept is illustrated in the model proposed for the ultrastructure of the Chromatium chromatophore [6]. In this instance (Fig. 12), the submicro- scopic architecture is generated by the juxtaposition of molecular units. As in crystallization, it is the properties of the building block, a pigmented protein with hydrophilic and hydrophobic poles, which determine the. Fig. 12. Working hypothesis of the ultrastrvictu
. Biological structure and function; proceedings. Biochemistry; Cytology. 322 J. A. BERGERON AND R. C. FULLER which can be extrapolated to the molecular level. An application of this concept is illustrated in the model proposed for the ultrastructure of the Chromatium chromatophore [6]. In this instance (Fig. 12), the submicro- scopic architecture is generated by the juxtaposition of molecular units. As in crystallization, it is the properties of the building block, a pigmented protein with hydrophilic and hydrophobic poles, which determine the. Fig. 12. Working hypothesis of the ultrastrvicture of the chromatophore. The Chromatiimi chromatophore is described as a hollow sphere about 320 A in diameter with a cortex about 90 A thick. The pigment molecules (B) aligned in a monolayer are bounded internally by a phospholipid (A) monolayer and externally by a 60 A thick protein layer. The "minimal unit" of composition has been used as a structural subunit. The protein has been folded and is related directly to two chlorophyll molecules. On the average the protein is related indirectly to one carotenoid molecule and ten phospholipid molecules. form of the assemblage. Such a scheme provides for specificity in a protein of conventional dimensions, requires no assumptions beyond the principles of molecular interaction for obtaining a higher level of organization, and also allows for great flexibility in the composition of the lipid phase. If structural organization, above the molecular level, is a prerequisite for photosynthesis, then the Chlorobiiim holochrome must approach the limiting conditions. This particle is already within the physical range of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry;
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