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Dev Biol 1994 Sep 01;1651:73-85. doi: 10.1006/dbio.1994.1235.
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Endo16, a large multidomain protein found on the surface and ECM of endodermal cells during sea urchin gastrulation, binds calcium.

Soltysik-EspaƱola M , Klinzing DC , Pfarr K , Burke RD , Ernst SG .

Endo16 encodes a developmentally regulated protein restricted to cells participating in the formation of the archenteron during sea urchin gastrulation and to the stomach of the pluteus. The 4680-nt coding region of the Endo16 gene has been sequenced from overlapping cDNAs. Sequence analysis revealed that Endo16 is a large multidomain protein starting with a putative signal sequence at its amino terminus which is followed by a cysteine-rich region, two potential heparin-binding regions, an acidic domain of 5 clustered repeats, an RGD cell binding motif, and a group of 12 additional acidic repeats. Immunolocalization by confocal and electron microscopy demonstrate that the Endo16 protein is in the extracellular matrix and associated with the surface of endodermal cells in the mid and hindgut of the archenteron. The two distinct acidic repeat regions are similar to known calcium-binding sequences. A recombinant Endo16 protein containing both putative calcium-binding repeat regions has been shown to bind radioactive calcium. Tryptic digests of gastrula stage protein extracts in the presence and the absence of calcium have established that calcium stabilizes Endo16 protein against proteolytic degradation.

PubMed ID: 8088452
Article link: Dev Biol

Genes referenced: endo16 LOC100887844 LOC115919910 LOC115925415 LOC115926321
Antibodies: endo16 Ab1