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TitleStructure of the chromoprotein ovorubin from the golden apple snail (Pomacea canaliculata).
Journal, issue, pagesProtein Sci, Vol. 35, Issue 1, Page e70439, Year 2026
Publish dateDec 23, 2025
AuthorsPatcharin Wilasluck / Wuan-Geok Saw / Bich Ngoc Tran / Grzegorz Sabat / Orion Shih / Kowit Hengphasatporn / Yasuteru Shigeta / Nawaporn Vinayavekhin / Kittikhun Wangkanont /
PubMed AbstractThe golden apple snail (Pomacea canaliculata), an invasive gastropod, produces distinctly bright pink egg masses. The astaxanthin-binding ovorubin (P. canaliculata ovorubin [PcOvo]) is a 300-kDa ...The golden apple snail (Pomacea canaliculata), an invasive gastropod, produces distinctly bright pink egg masses. The astaxanthin-binding ovorubin (P. canaliculata ovorubin [PcOvo]) is a 300-kDa glycoprotein responsible for the egg coloration. Here, we determine the three-dimensional structure of PcOvo using cryo-electron microscopy (cryo-EM). PcOvo is a heterodecameric protein consisting of two copies of each PcOvo1-5 subunit. The subunits have similar repeated ferredoxin-like structures. N-linked glycosylation sites are identified. Solution x-ray scattering data support the overall architecture of the complex. PcOvo3 and PcOvo5 have hydrophobic pockets that likely bind various hydrophobic compounds. The cryo-EM map and binding experiments suggest that PcOvo5 binds astaxanthin, which is responsible for the pink color of the protein. Our structure provides molecular insights into the nature of the gastropod egg coloration and lays a foundation for further investigation of ovorubin biology and evolution.
External linksProtein Sci / PubMed:41432377 / PubMed Central
MethodsEM (single particle)
Resolution2.12 Å
Structure data

63984

9uaj

EMDB-63984, PDB-9uaj:
Ovorubin from the golden apple snail (Pomacea canaliculata)
Method: EM (single particle) / Resolution: 2.12 Å

Chemicals

ChemComp-08O:
(Z)-docos-13-enoic acid

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

ChemComp-HOH:
WATER

Source
  • pomacea canaliculata (invertebrata)
KeywordsLIPID BINDING PROTEIN / ovorubin / golden apple snail / Pomacea canaliculata

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