NDLI: Euphausiid visual pigments. The rhodopsins of Euphausia superba and Meganyctiphanes norvegica (Crustacea, Euphausiacea)

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Euphausiid visual pigments. The rhodopsins of Euphausia superba and Meganyctiphanes norvegica (Crustacea, Euphausiacea)

Content Provider	Semantic Scholar
Author	Denys, Christiane Brown, Paul K.
Copyright Year	1982
Abstract	The rhabdoms of Euphausia superba contain one digitonin-extractable rhodopsin, lambda max 485 nm. The rhodopsin undergoes unusual pH-dependent spectral changes: above neutrality, the absorbance decreases progressively at 485 nm and rises near 370 nm. This change is reversible and appears to reflect an equilibrium between a protonated and an unprotonated form of the rhodopsin Schiff-base linkage. Near neutral pH and at 10 degrees C, the rhodopsin is partiaLly converted by 420-nm light to a stable 493-nm metarhodopsin. The metarhodopsin is partially photoconverted to rhodopsin by long-wavelength light in the absence of NH2OH; in the presence of NH2OH, it is slowly converted to retinal oxime and opsin. The rhodopsin of Meganyctiphanes norvegica measured in fresh rhabdoms by microspectrophotometry has properties very similar to those of the extracted rhodopsin of E. superba. Its lambda max is 488 nm and it is partially photoconverted by short wavelength irradiation to a stable photoconvertible metarhodopsin similar to that of E. superba. In the presence of light and NH2OH, the M. norvegica metarhodopsin is converted to retinal oxime and opsin. Our results indicate that previous determinations of euphausiid rhodopsin absorbance spectra were incorrect because of accessory pigment contamination.
Starting Page	451
Ending Page	472
Page Count	22
File Format	PDF HTM / HTML
PubMed reference number	7142953
Volume Number	80
Journal	The Journal of general physiology
Alternate Webpage(s)	http://ftp.ncbi.nlm.nih.gov/pub/pmc/be/40/jg803451.PMC2228684.pdf
Language	English
Access Restriction	Open
Subject Keyword	Acid-Base Equilibrium Adjudication Digitonin Encyonema norvegica Euphausiacea Extraction Microspectrophotometry Oximes Retinal Pigments Retinaldehyde Rhodopsin Rhodopsin, Human Subphylum Crustacea Superba metarhodopsins wavelength
Content Type	Text
Resource Type	Article

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