Phycobiliproteins

MacColl, Robert; Guard-Friar, Deborah

doi:10.1201/9781351075565

Cited by 17 publications

(22 citation statements)

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“…PBSs are comprised of rods attached to a core complex that is directly linked to PSII. In Synechocystis the rods contain phycocyanin, which can harvest long wavelength light and transfer its energy to the allophycocynin core, which then transduces it directly to the PSII reaction center ( Maccoll and Guard-Friar, 1986 ). In the reaction center the main pigment is chlorophyll a , whereas in the PBS the chromophore is phycocyanobilin or some other, structurally related pigment.…”

Section: How Do Carotenoids Affect the Structure And Processes Of Phymentioning

confidence: 99%

Carotenoids Assist in Cyanobacterial Photosystem II Assembly and Function

et al. 2016

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Carotenoids (carotenes and xanthophylls) are ubiquitous constituents of living organisms. They are protective agents against oxidative stresses and serve as modulators of membrane microviscosity. As antioxidants they can protect photosynthetic organisms from free radicals like reactive oxygen species that originate from water splitting, the first step of photosynthesis. We summarize the structural and functional roles of carotenoids in connection with cyanobacterial Photosystem II. Although carotenoids are hydrophobic molecules, their complexes with proteins also allow cytoplasmic localization. In cyanobacterial cells such complexes are called orange carotenoid proteins, and they protect Photosystem II and Photosystem I by preventing their overexcitation through phycobilisomes (PBS). Recently it has been observed that carotenoids are not only required for the proper functioning, but also for the structural stability of PBSs.

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Section: How Do Carotenoids Affect the Structure And Processes Of Phymentioning

confidence: 99%

Carotenoids Assist in Cyanobacterial Photosystem II Assembly and Function

et al. 2016

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“…Purified R-PE was obtained from C. formosanum, and similar to the R-PE extracted from the Mediterranean red algae Corallina elongata [41], characteristic peaks were observed at 280, 498, and 566 nm, but not 620 nm, indicating that the purified R-PE exhibits high purity and a low PC content (λ: 610-620 nm) [42]. In addition, R-PE purified from C. formosanum was a classical "three-peak" phycoerythrin with maximum absorption observed at 498, 539, and 565 nm, respectively (Figure 2).…”

Section: Discussionmentioning

confidence: 92%

R-Phycoerythrin from Colaconema formosanum (Rhodophyta), an Anti-Allergic and Collagen Promoting Material for Cosmeceuticals

et al. 2021

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R-phycoerythrin (R-PE), a pigment complex found in red algae, was extracted and purified from a newly identified red alga, Colaconema formosanum, and its bioactivities were examined. It was revealed that R-PE treatment resulted in high cell viability (>70%) to the mammalian cell lines NIH-3T3, RBL-2H3, RAW264.7, and Hs68, and had no effect on cell morphology in NIH-3T3 cells. Its suppression effect was insignificant on the production of IL-6 and TNF-α in lipopolysaccharides-stimulated RAW264.7 cells. However, calcium ionophore A23187-induced β-hexosaminidase release was effectively inhibited in a dose-dependent manner in RBL-2H3 cells. Additionally, it was revealed to be non-irritating to bionic epidermal tissues. Notably, procollagen production was promoted in Hs68 cells. Overall, the data revealed that R-PE purified from C. formosanum exhibits anti-allergic and anti-aging bioactivities with no observed consequential toxicity on multiple mammalian cell lines as well as epidermal tissues, suggesting that this macromolecule is a novel material for potential cosmetic use.

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“…($250 nm) with high molar absorptivities ($10 6 M À1 cm À1 ), and then efficiently transfer this energy to sensitize neighboring proteins that contain the reactive site. [25][26][27][28][29][30][31][32] Inspired by the modularity found in biology, several types of photocatalysts have been produced that employ a similar approach. 33 Nanoparticles or small molecules were covalently attached to enzymes, and electron transfer between them has been demonstrated.…”

Section: The Bigger Picturementioning

confidence: 99%