. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 368 RAYMOND F. JONES AND L. R. BLINKS least phycocyanin. P. naiadum possesses comparatively large amounts of both phycocyanin and phycoerythrin. P'. perforata has proportionately the most phyco- cyanin and the least phycoerythrin. Allophycocyanin is present in all three species of Porphyra, but is most abundant in P. naiadum. The absorption spectra for the various isolated and chromatographically purified phycobilins are shown in Figure 1. The amino acid composition of these chromoproteins is given in Table II. The distribut
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 368 RAYMOND F. JONES AND L. R. BLINKS least phycocyanin. P. naiadum possesses comparatively large amounts of both phycocyanin and phycoerythrin. P'. perforata has proportionately the most phyco- cyanin and the least phycoerythrin. Allophycocyanin is present in all three species of Porphyra, but is most abundant in P. naiadum. The absorption spectra for the various isolated and chromatographically purified phycobilins are shown in Figure 1. The amino acid composition of these chromoproteins is given in Table II. The distribution of the amino acids is expressed as a percentage of the total weight of the amino acids in the protein. It is seen that, in the phycobilins isolated, the same m il. FIGURE 2. The major amino acid components of four chromoprotein fractions of Porphyra naiadum. Acidic amino acids are shown in white, basic, cross-hatched, and neutral, in black. The amounts are indicated as percentage of the total. amino acids are present. Although tyrosine was not detected in the phycocyanin from P. naiadum it may well be due to the fact that this amino acid exists in concen- trations considerably lower than that of any other amino acid present. The quan- titative distribution of each amino acid varies for each protein analyzed. In all cases the dicarboxylic amino acids predominate and are comparable. Of the neutral amino acids, alanine and the two leucines are highest, although in the phycoerythrin isolated from P. Nereocystis glycine is present in relatively high concentration. It is interesting to note that alanine is present in greater amount than any other amino acid in the phycoerythrins isolated from P. naiadum and P. perforata. The basic amino acids of all the phycocyanins are low compared with the other phycobilin pro- teins. A histogram of the distribution in P. naiadum is shown in Figure 2. DISCUSSION The absorption characteristics of the isolated chromoproteins described in this wor
Size: 2019px × 1238px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
