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

Types of blastula, TYPES OF BLASTULA - Blastulas are of following type ...

TYPES OF BLASTULA - Blastulas are of following type -                    1 .       STEREOBLASTULA - The blastocoel is very small. It's blastomere are less in num

Platyhelminthes - regeneration in invertebrates, Platyhelminthes (Flatworms...

Platyhelminthes (Flatworms) - Regeneration in Invertebrates Between flatworms the turbellarians, (mostly fresh water species and fresh water and terrestrial triclads) routinel

Silver point and silver point removal-endodontics principles, Silver point:...

Silver point: -    Uses of silver point: ease of handing and placement, ductility, radiopacity,and have  some antibacterial activity. -    Lack of acceptable 3D seal of the ca

Off pump surgery , OFF PUMP SURGERY :  In spite of great advancements in t...

OFF PUMP SURGERY :  In spite of great advancements in techniques of cardio pulmonary bypass, it is still not physiological. There can be various complications related to perfusion

Endocrine glands that regulate sexual activity in males, Q. What are the en...

Q. What are the endocrine glands that regulate sexual activity in males? How does this regulation work and what are the involved hormones? In males the sexual activity is regul

Two biotic factors could affect an antelope, What two biotic factors could ...

What two biotic factors could affect an antelope living in the Serengeti? The biotic factors that may affect an antelope living in the Serengeti could be:predation by carnivore

Describe insulin resistance in non-conventional factors, Describe Insulin r...

Describe Insulin resistance in Non-conventional Factors ? Insulin resistance refers to a generalized metabolic disorder in which various tissues are resistant to normal levels of

What is the importance of surface area, A. How is the villus the functional...

A. How is the villus the functional unit of the small intestine? In your answer, include a discussion of its structure and function and the enzymes found there. What is the importa

Population distribution, Population Distribution - Population Parameters an...

Population Distribution - Population Parameters and Regulation Dispersion or distribution refers to the pattern of distribution of individuals of a population. As shown in Fig

Explain why statement is logical in terms of kin selection, Biology once sa...

Biology once said why this statement is logical in terms of kin selection and use the coefficient of relatedness he'd be willing to lay down his life to save two brothers or eight

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