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Rhodopsin adalah pigmen yang ada di sel fotoreseptor dari organ retina yang bertanggung jawab terhadap persepsi cahaya. Rhodopsin masuk dalam keluarga reseptor protein berpasangan G dan sangat sensitiv terhadap cahaya, yang mampu menangkap cahaya yang rendah.^[1] Saat terkena cahaya, pigmennya akan segera mengalami fotoblecing dan manusia memerlukan waktu sekitar 30 menit untuk melakukan hal ini.^[2]

Struktur

Rhodopsin terdiri dari gugus fungsional opsin dan sebuah ikatan kovalen alkanal vitamin A yang terbalik. Opsin, sebuah ikatan dari tujuh transmembran heliks terikat satu sama lain oleh lingkaran protein, mengikat fotoreaktif retina yang terletak di pusat pada residu linisa.

Referensi

^ Litmann BJ, Mitchell DC (1996). "Rhodopsin structure and function". Dalam Lee AG. Rhodopsin and G-Protein Linked Receptors, Part A (Vol 2, 1996) (2 Vol Set). Greenwich, Conn: JAI Press. hlm. 1–32. ISBN 1-55938-659-2.
^ Stuart JA, Brige RR (1996). "Characterization of the primary photochemical events in bacteriorhodopsin and rhodopsin". Dalam Lee AG. Rhodopsin and G-Protein Linked Receptors, Part A (Vol 2, 1996) (2 Vol Set). Greenwich, Conn: JAI Press. hlm. 33–140. ISBN 1-55938-659-2.

Baca juga

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