background:
The organic anion transporter family of proteins mediate hepatic uptake of cardiac glycosides. OATP-D is a 710 amino acid member of the organic anion transporter protein family. As a multi-pass membrane protein, OATP-D mediates the Na+-independent transport of vasopressin, prostaglandins (PG) E1 and E2, thyroxine (T4), deltorphin II and other organic anions, but not estrone-3-sulfate, DPDPE, taurocholate, DHEAS or digoxin. OATP-D is ubiquitously expressed with highest levels present in leukocytes and spleen. OATP-D is expressed as four isoforms produced by alternative splicing events.
Function:
SLCO3A1 mediates the Na+-independent transport of organic anions such as estrone-3-sulfate. It mediates transport of prostaglandins (PG) E1 and E2, thyroxine (T4), deltorphin II, BQ-123 and vasopressin, but not DPDPE (a derivative of enkephalin lacking an N-terminal tyrosine residue), taurocholate, digoxin nor DHEAS. There are four named isoforms.
Subcellular Location:
Membrane; Multi-pass membrane protein.
Tissue Specificity:
Ubiquitous. Highly expressed in spleen and leukocytes. Generally the expression of isoform 1 is higher than that of isoform 2. Isoform 2 is particularly abundant in testis and brain. In testis, isoform 1 is detected in spermatogonia at different stages and absent from Sertoli cells, while isoform 2 is present in both (at protein level). Expressed in the choroid plexus epithelium, isoform 1 being localized at the basolateral membrane and isoform 2 at the apical one, as well as in the subapical intracellular vesicular compartments. Differential expression of both isoforms is also observed in other brain region: isoform 1 is very abundant in the gray matter of the frontal cortex, but is not associated with neuronal cell bodies. Not detected in the white matter. In contrast, isoform 2 is associated with neuronal bodies and axons in both the gray and the white matters of the frontal cortex.
Similarity:
Belongs to the organo anion transporter (TC 2.A.60) family.
Contains 1 Kazal-like domain.
Database links:
Entrez Gene: 28232 Human
Entrez Gene: 108116 Mouse
Entrez Gene: 140915 Rat
Omim: 612435 Human
SwissProt: Q9UIG8 Human
SwissProt: Q8R3L5 Mouse
SwissProt: Q99N02 Rat
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
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