What is the function of phycobiliproteins?

Phycobiliproteins are deep-colored, water-soluble proteins that are present mainly in cyanobacteria and rhodophyta. They capture light energy, which is then passed on to chlorophylls during photosynthesis.

What is phycoerythrin in biology?

Phycoerythrin (PE) is a red protein pigment complex produced by the light-harvesting phycobiliprotein family. It is present in red algae and cryptophytes as an accessory to the main chlorophyll pigments responsible for photosynthesis (Ficner and Huber, 1993; van der Weij-De Wit et al., 2006).

Where do you find phycobiliproteins?

Phycobiliproteins are intensely fluorescent proteins that function as components in the photosynthetic apparatus of eukaryotic blue–green algae and cyanobacteria (Glazer, 1981; Samarakoon et al., 2012). The proteins are found as aggregates in phycobilisome particles near the chlorophyll regions (Kronick, 1986).

What is phycobilins in biology?

Phycobilins (from Greek: φύκος (phykos) meaning “alga”, and from Latin: bilis meaning “bile”) are light-capturing bilins found in cyanobacteria and in the chloroplasts of red algae, glaucophytes and some cryptomonads (though not in green algae and plants).

Is Phycobiliproteins a pigment?

Phycobiliproteins are water-soluble pigments present in the family of red algae (rhodophytes, cryptomonads, glaucocystophytes).

Where is phycocyanin found?

4.2 Phycocyanin. PC is found in cyanobacteria, Rhodophyceae, and Cryptophyceae and is called C-PC and R-PC according to the species. R-PC is a minor pigment in red microalgae.

What is phycoerythrin function?

Phycoerythrin is an accessory pigment to the main chlorophyll pigments responsible for photosynthesis. The light energy is captured by phycoerythrin and is then passed on to the reaction centre chlorophyll pair, most of the time via the phycobiliproteins phycocyanin and allophycocyanin.

What is phycocyanin phycoerythrin?

Phycocyanin and phycoerythrin are photosynthetic pigments extracted from microalgae with great biotechnological potential due to their intense colors, fluorescent properties and potential health benefits.

What are the three kinds of Phycobiliproteins and what are they responsible for?

Phycobiliproteins are classified into three types according to level of phycobilin energy (absorption spectra): those of high energy are phycoerythrins (PEs), or phycoerythrocyanins (PECs), with main absorption at 480–580 nm; those of intermediate energy are phycocyanins (PCs), with main absorption at 600–640 nm; and …

How does the light energy transfer take place in Phycobiliproteins?

How Does the Light Energy Transfer Take Place in Phycobiliproteins? The change in light color from green to red takes place through a process known as fluorescence. APC takes up this light-red light and changes it to a deep red light for Chl.

What are phycobilins examples?

Phycobilins that are covalently linked to proteins are referred to as phycobiliproteins, which serve as chromophores. Examples of phycobiliproteins are phycoerythrin, phycocyanin, allophycocyanin, etc….Phycobilin

  • accessory pigment.
  • carotenoid.
  • chlorophyll.
  • carotene.
  • cyanobacteria.

What is Phycobilisomes function?

Phycobilisomes. Phycobilisomes in cyanobacteria and red algae are large antennae complexes that absorb light energy and transfer the energy for use in photosynthesis. These phycobiliprotein complexes absorb much of the visible spectrum and thus benefit the organisms by greatly extending their absorbance capacity.

What are phycobiliproteins and what do they do?

Phycobiliproteins are formed of a complex between proteins and covalently bound phycobilins that act as chromophores (the light-capturing part). They are most important constituents of the phycobilisomes .

Can phycobiliproteins be used as fluorescent labels?

Although these phycobiliproteins are brightly fluorescent, their unique properties must be considered when used as fluorescent labels. Their intensity of fluorescence is greatly reduced by denaturation of their protein component.

What type of phycoerythrin is in Red microalgae?

Phycoerythrin (PE) is a red-colored phycobiliprotein found in the chloroplast of red microalgae. B-phycoerythrin (BPE) and R-phycoerythrin (RPE) are two main classes of PE found in red microalgae.

How many phycoerythrobilins (PEB) are in the beta subunit?

The α subunit has two phycoerythrobilins (PEB), the β subunit has 2 or 3 PEBs and one phycourobilin (PUB), while the different gamma subunits are reported to have 3 PEB and 2 PUB (γ 1) or 1 or 2 PEB and 1 PUB (γ 2 ).