Chicken blue and chicken violet, short wavelength sensitive visual pigments

Fager, Lei Yen; Fager, Roger S.

doi:10.1016/0042-6989(81)90104-8

Cited by 53 publications

(17 citation statements)

References 14 publications

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“…An aspect of SWS1 spectral tuning that has received comparatively little attention concerns the variation in maximal absorption of VS SWS1 pigments. The few avian VS pigments that have been studied experimentally, the pigeon and chicken, differ considerably in their λ max values (388 and 429 nm, respectively; Fager and Fager, ; Carvalho et al, ). How VS pigments with such different wavelength sensitivities might influence visual performance is currently unknown.…”

Section: Site‐directed Mutagenesis Studies Of Sws1 Spectral Tuningmentioning

confidence: 99%

“…Additionally, λ max estimates measured in vivo by microspectrophotometery (MSP) may differ from those made in vitro by expression of pigments. For instance, the λ max of chicken SWS1 estimated from in vitro expressed pigments can vary by several nm (415 nm, Yokoyama et al, ; 419 nm, Carvalho et al, ), while the λ max inferred from the purified eye pigment is 417 nm (Fager and Fager, ), and from MSP of intact photoreceptors is 418 nm (Bowmaker et al, ).…”

Section: Experimental Challenges In Determining Sws1 λMaxmentioning

confidence: 99%

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Spectral tuning in vertebrate short wavelength‐sensitive 1 (SWS1) visual pigments: Can wavelength sensitivity be inferred from sequence data?

2014

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The molecular mechanisms underlying the enormous diversity of visual pigment wavelength sensitivities found in nature have been the focus of many molecular evolutionary studies, with particular attention to the short wavelength-sensitive 1 (SWS1) visual pigments that mediate vision in the ultraviolet to violet range of the electromagnetic spectrum. Over a decade of study has revealed that the remarkable extension of SWS1 absorption maxima (λ max ) into the ultraviolet occurs through a deprotonation of the Schiff base linkage of the retinal chromophore, a mechanism unique to this visual pigment type. In studies of visual ecology, there has been mounting interest in inferring visual sensitivity at short wavelengths, given the importance of UV signaling in courtship displays and other behaviors. Since experimentally determining spectral sensitivities can be both challenging and time-consuming, alternative strategies such as estimating λ max based on amino acids at sites known to affect spectral tuning are becoming increasingly common. However, these estimates should be made with knowledge of the limitations inherent in these approaches. Here, we provide an overview of the current literature on SWS1 site-directed mutagenesis spectral tuning studies, and discuss methodological caveats specific to the SWS1-type pigments. We focus particular attention on contrasting avian and mammalian SWS1 spectral tuning mechanisms, which are the best studied among vertebrates. We find that avian SWS1 visual pigment spectral tuning mechanisms are fairly consistent, and therefore more predictable in terms of wavelength absorption maxima, whereas mammalian pigments are not well suited to predictions of λ max from sequence data alone.

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Section: Site‐directed Mutagenesis Studies Of Sws1 Spectral Tuningmentioning

confidence: 99%

Section: Experimental Challenges In Determining Sws1 λMaxmentioning

confidence: 99%

Spectral tuning in vertebrate short wavelength‐sensitive 1 (SWS1) visual pigments: Can wavelength sensitivity be inferred from sequence data?

2014

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“…T. Casadevall, personal communication. 18. Supported by NASA contract 1006A (NAG-1-200) (with Drexel University).…”

mentioning

confidence: 99%

Ultraviolet Visual Pigment in a Vertebrate: A Tetrachromatic Cone System in the Dace

Hárosi

Hashimoto

1983

Science

186

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“…The protein conformation of cone opsins, unlike rod opsins, allows the Schiff base to be easily accessible to hydroxylamine, resulting in rapid bleaching of dark adapted pigments (Wald et al . , Fager and Fager , Okano et al . ).…”

Section: Resultsmentioning

confidence: 99%

Visual predation during springtime foraging of the North Atlantic right whale (Eubalaena glacialis)

Fasick¹,

Baumgartner

Cronin

et al. 2017

Marine Mammal Science

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To assess the role that vision plays in the ability of the North Atlantic right whale (Eubalaena glacialis) to detect its primary prey species, the calanoid copepod Calanus finmarchicus, we have compared the absorbance spectrum of the E. glacialis rod visual pigment, the transmittance spectra of C. finmarchicus carotenoid pigments, as well as the downwelling irradiance and horizontal radiance spectra collected during springtime at three locations in the western Gulf of Maine. The E. glacialis rod visual pigment absorbs light maximally at 493 nm, while microspectrophotometric measurements of the C. finmarchicus carotenoid pigments reveal transmission spectra with minima matching very well with the E. glacialis rod visual pigment absorbance spectra maximum. Springtime spectral downwelling irradiance and horizontal radiance values from the surface waters of Cape Cod Bay and at all depths in Great South Channel overlap the E. glacialis rod absorbance spectrum, allowing C. finmarchicus to appear as a high‐contrast dark silhouette against a bright background spacelight, thus facilitating visually guided contrast foraging. In contrast, spectral downwelling irradiance and horizontal radiance at depth in Cape Cod Bay, and all depths in Wilkinson Basin, do not overlap the E. glacialis rod absorbance spectrum, providing little if any useful light for contrast vision.

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Chicken blue and chicken violet, short wavelength sensitive visual pigments

Cited by 53 publications

References 14 publications

Spectral tuning in vertebrate short wavelength‐sensitive 1 (SWS1) visual pigments: Can wavelength sensitivity be inferred from sequence data?

Spectral tuning in vertebrate short wavelength‐sensitive 1 (SWS1) visual pigments: Can wavelength sensitivity be inferred from sequence data?

Ultraviolet Visual Pigment in a Vertebrate: A Tetrachromatic Cone System in the Dace

Visual predation during springtime foraging of the North Atlantic right whale (Eubalaena glacialis)

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