H

OHCH2CH2N+(CH3)3 Choline

OH ■ CH2CH2NH+ Ethanolamine

Serine

Phosphatidic acid

Phosphatidyl choline (lecithin)

Phosphatidyl ethanolamine

Phosphatidylserine

Animals, higher plants, microorganisms.

Animals; first isolated from egg yolks; higher plants; rare in microorganisms.

Animals; higher plants; microorganisms.

Animals; higher plants; microorganisms.

Only small amounts normally found. Main importance as a biosynthetic intermediate.

Most abundant animal phospholipid.

Widely distributed but in small amounts. Minor component of old 'cephaline' fraction. N-acetyl derivatives in brain; fatty amides in wheat flour, peas.

Widely distributed but in small amounts. Minor component of old 'cephaline' fraction. Serine as L isomer. Lipid usually in salt form with K+ Na+ Ca2+.

Continued on p. 218

Table 6.3 Continued

Name of Phospholipid Source

Remarks

Myo-inositol

Phosphatidylinositol

Myo-inositol

Inositol-4-phosphate

Inositol-4, 5-bisphosphate

Mmannose} Inositol mannoside

Mmannose} Inositol mannoside

Phosphatidylinositol phosphate

Phosphatidylinositol fcisphosphate

Phosphatidylinositol mannoside

X = 0, monomannoside X = 1, dimannoside etc

Phosphatidylglycerol

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