Galactogen

Galactogen
	; General structure of the polysaccharide galactogen
Names
	IUPAC name beta-D-galacto-hexopyranosyl-(1->3)-[beta-D-galacto-hexopyranosyl-(1->6)]-beta-D-galacto-hexopyranose
Identifiers
CAS Number	monomer: 121123-33-9;
3D model (JSmol)	monomer: Interactive image;
ChEBI	monomer: CHEBI:16883;
ChemSpider	monomer: 2733405;
KEGG	monomer: C01698;
PubChem CID	monomer: 46173715;
CompTox Dashboard (EPA)	DTXSID20392999 ;
	InChI monomer: InChI=1S/C18H32O16/c19-1-4-7(21)10(24)12(26)17(32-4)30-3-6-9(23)15(14(28)16(29)31-6)34-18-13(27)11(25)8(22)5(2-20)33-18/h4-29H,1-3H2/t4-,5-,6-,7+,8+,9+,10+,11+,12-,13-,14-,15+,16-,17-,18+/m1/s1 Key: KJZMZIMBDAXZCX-FKZYWASWSA-N;
	SMILES monomer: C([C@@H]1[C@@H]([C@@H]([C@H]([C@@H](O1)OC[C@@H]2[C@@H]([C@@H]([C@H]([C@@H](O2)O)O)O[C@H]3[C@@H]([C@H]([C@H]([C@H](O3)CO)O)O)O)O)O)O)O)O;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Galactogen is a polysaccharide of galactose that functions as energy storage in pulmonate snails and some Caenogastropoda.^[1] This polysaccharide is exclusive of the reproduction and is only found in the albumen gland from the female snail reproductive system and in the perivitelline fluid of eggs.

Galactogen serves as an energy reserve for developing embryos and hatchlings, which is later replaced by glycogen in juveniles and adults.^[2] The advantage of accumulating galactogen instead of glycogen in eggs remains unclear,^[3] although some hypotheses have been proposed (see below).

^ Goudsmit EM (1972). "Carbohydrates and carbohydrate metabolism in Mollusca.". In Florkin M, Scheer BT (eds.). Chemical Zoology. Vol. VII Mollusca. New York: Academic Press. pp. 219–244.
^ May F (1932). "Beitrag zur Kenntnis des Glykogen und Galaktogengehaltes bei Helix pomatia". Z. Biol. 92: 319–324.
^ Urich K (1994). Comparative Animal Biochemistry. Springer Berlin Heidelberg. pp. 1–8. doi:10.1007/978-3-662-06303-3_1. ISBN 978-3-642-08181-1.

[:1-1] Goudsmit EM (1972). "Carbohydrates and carbohydrate metabolism in Mollusca.". In Florkin M, Scheer BT (eds.). Chemical Zoology. Vol. VII Mollusca. New York: Academic Press. pp. 219–244.

[:2-2] May F (1932). "Beitrag zur Kenntnis des Glykogen und Galaktogengehaltes bei Helix pomatia". Z. Biol. 92: 319–324.

[:0-3] Urich K (1994). Comparative Animal Biochemistry. Springer Berlin Heidelberg. pp. 1–8. doi:10.1007/978-3-662-06303-3_1. ISBN 978-3-642-08181-1.

[1]

[2]

[3]

Names
General structure of the polysaccharide galactogen
IUPAC name beta-D-galacto-hexopyranosyl-(1->3)-[beta-D-galacto-hexopyranosyl-(1->6)]-beta-D-galacto-hexopyranose
Identifiers
CAS Number	monomer: 121123-33-9
3D model (JSmol)	monomer: Interactive image
ChEBI	monomer: CHEBI:16883
ChemSpider	monomer: 2733405
KEGG	monomer: C01698
PubChem CID	monomer: 46173715
CompTox Dashboard (EPA)	DTXSID20392999
InChI monomer: InChI=1S/C18H32O16/c19-1-4-7(21)10(24)12(26)17(32-4)30-3-6-9(23)15(14(28)16(29)31-6)34-18-13(27)11(25)8(22)5(2-20)33-18/h4-29H,1-3H2/t4-,5-,6-,7+,8+,9+,10+,11+,12-,13-,14-,15+,16-,17-,18+/m1/s1 Key: KJZMZIMBDAXZCX-FKZYWASWSA-N
SMILES monomer: C([C@@H]1[C@@H]([C@@H]([C@H]([C@@H](O1)OC[C@@H]2[C@@H]([C@@H]([C@H]([C@@H](O2)O)O)O[C@H]3[C@@H]([C@H]([C@H]([C@H](O3)CO)O)O)O)O)O)O)O)O
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references