Amino acid composition and mole-percent of amino acids in proteins of embryos and larvae of the sea urchin Lytechinus pictus
| Amino acid . | Mean percent composition in protein . |
|---|---|
| Histidine | 2.0±0.02 |
| Methionine | 2.0±0.06 |
| Tyrosine | 2.9±0.08 |
| Phenylalanine | 3.8±0.05 |
| Isoleucine | 5.0±0.14 |
| Proline | 5.0±0.07 |
| Arginine | 5.3±0.05 |
| Threonine | 5.6±0.04 |
| Valine | 6.4±0.01 |
| Serine | 6.8±0.07 |
| Lysine | 7.3±0.11 |
| Alanine | 7.8±0.02 |
| Leucine | 7.9±0.19 |
| Glycine | 9.7±0.54 |
| Aspartate,Asparagine* | 10.9±0.21 |
| Glutamate,Glutamine* | 11.8±0.17 |
| †MWp(g mole−1) | 129.4±0.40 |
| Amino acid . | Mean percent composition in protein . |
|---|---|
| Histidine | 2.0±0.02 |
| Methionine | 2.0±0.06 |
| Tyrosine | 2.9±0.08 |
| Phenylalanine | 3.8±0.05 |
| Isoleucine | 5.0±0.14 |
| Proline | 5.0±0.07 |
| Arginine | 5.3±0.05 |
| Threonine | 5.6±0.04 |
| Valine | 6.4±0.01 |
| Serine | 6.8±0.07 |
| Lysine | 7.3±0.11 |
| Alanine | 7.8±0.02 |
| Leucine | 7.9±0.19 |
| Glycine | 9.7±0.54 |
| Aspartate,Asparagine* | 10.9±0.21 |
| Glutamate,Glutamine* | 11.8±0.17 |
| †MWp(g mole−1) | 129.4±0.40 |
Values are means ± s.e.m., N=5.
Asparagine and glutamine are converted to aspartate and glutamate,respectively, during acid-hydrolysis of proteins. Also, cysteine and tryptophan are lost during routine acid-hydrolysis.
MWp, mole-percent corrected molecular mass; represents the average molecular mass of amino acids in the protein pool of embryos and larvae of L. pictus. MWp is calculated by multiplying the mole-percent value (given in this table) of each amino acid by its molecular mass, and then adding all mole-percent corrected masses of the amino acids.