Properties of phytochrome, Biology

Assignment Help:

Properties of Phytochrome

Phytochrome is a chromoprotein: this means it is composed of a protein and a chromophore. The chromophore is actually attached to the protein and is responsible for its-colour and light absorption. It is possible to isolate phytochrome in absolutely pure form by following the procedures of protein purification. The phytochrome in test-tubes also shows similar absorption characteristics. It absorbs red light (maximum absorption occurs at 660 nm wavelength) and on conversion, far-red light (maximum absorption occurs in far-red region at 730 nm). A typical absorption spectrum of phytochrome is shown-in figure. It is a soluble protein and is present in the cytoplasm. It is believed that Pfr form may be associated with the membranes. The intact phytochrome protein has a molecular weight of 124,000 daltons. .The total amino acid sequence of the protein is also known and, using recombinant DNA technology, the gene coding for phytochrome has been isolated.

1295_Properties of Phytochrome.png

Figure:  Absorption spectrum of phytochrome in vitro. Phytochrome was purified add its Absorption spectrum was measured by a spectrophotometer. When Pr was irradiated with red light, the absorption spectrum (dotted line) was obtained. This shows the conversion of Pr to Pfr.


Related Discussions:- Properties of phytochrome

Explain adverse effects of ganciclovir, Explain Adverse Effects of ganciclo...

Explain Adverse Effects of ganciclovir Ganciclovir is teratogenic, carcinogenic and mutagenic and causes aspermatogenesis in animals. Granulocytopenia and thrombocytopenia, whi

Help, A climate classification system divides regions according to _____?

A climate classification system divides regions according to _____?

Difference, 1:What is the difference between TERGA and STERNA? 2:What is th...

1:What is the difference between TERGA and STERNA? 2:What is the difference between AMPHID and PHASMID?

Explain mechanism for reduce the absorption of nutrients, Explain Mechanism...

Explain Mechanism for reduce the absorption of nutrients? The absorption of nutrients is also reduced by mechanisms other than increasing the viscosity of gastrointestinal cont

Define fluconazole, Define Fluconazole It is a weaker inhibitor of CYP...

Define Fluconazole It is a weaker inhibitor of CYP3A4 than itraconazole or ketoconazole but may still increase serum concentrations of drugs metabolized by 3A4, like cyclospor

Valvular heart diseases and its causes, Valvular Heart Diseases Normal...

Valvular Heart Diseases Normal heart valves function to maintain a uni-directional flow of blood through cardiac chambers. Two basic problems that compromise the normal functi

Define foaming properties of proteins, Define Foaming Properties, Binding o...

Define Foaming Properties, Binding of Flavour and Other Substances? To understand the foaming properties of proteins, we need to know some basic aspects of foam foods. Foam foo

How are antivenoms produced, Q. How are antivenoms produced? Why are antive...

Q. How are antivenoms produced? Why are antivenoms an example of passive immunization? Antivenoms are obtained by the following process: the venom (antigen) is inoculated into

Explain flavour binding - protein, Flavour Binding   Some   protein pre...

Flavour Binding   Some   protein preparations, although acceptable from a functional and nutritional stand point, necessitate  a deodorizing step to remove the bound off-flavor

Regulation of pfk and fructose 1, When the level of AMP is high, this shows...

When the level of AMP is high, this shows the requirement for more ATP synthesis. AMP stimulates PFK increases the rate of glycolysis and inhibits fructose 1 and 6- bisphosphatase

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd