alltransretinalu

Alltransretinalu is not a standard chemical name and does not correspond to a widely recognized, uniquely identified compound in major chemical databases. It appears to be a typographical variant or informal shorthand for all-trans-retinal (retinaldehyde) or, less commonly, for a derivative thereof. There is no established entry for a molecule exactly named “alltransretinalu” in major references as of 2024. When the term is encountered in texts, it is usually best read as all-trans-retinal or as a generic reference to all-trans-retinal–related chemistry.

All-trans-retinal itself is a C20H28O aldehyde derived from vitamin A. It features an extended all-trans polyene chain and a reactive aldehyde group. In the vertebrate visual cycle, 11-cis-retinal bound to opsin absorbs a photon and is converted to all-trans-retinal, triggering isomerization and vision. Free all-trans-retinal is promptly reduced to all-trans-retinol by retinol dehydrogenases, preventing aldehyde toxicity. Retinol is transported to the retinal pigment epithelium, re-esterified, and eventually converted back to 11-cis-retinal to regenerate photoreceptors. If all-trans-retinal accumulates, it can form Schiff bases with lysine residues in proteins or react to form bis-retinoid compounds such as A2E, contributing to lipofuscin buildup and retinal stress, especially when transporter ABCA4 function is impaired (as in Stargardt disease).

In summary, “alltransretinalu” is not a standard chemical entry; it most likely refers to all-trans-retinal in ordinary scientific usage. See also all-trans-retinal, all-trans-retinol, the visual cycle, and Stargardt disease.