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

Human impact on the environmetn, what are the two main pollutants that cont...

what are the two main pollutants that contribute to acidic rain?

Definition of somatoform disorders, Definition of Somatoform Disorders: ...

Definition of Somatoform Disorders: The term 'Somatoform Disorders' was introduced in the scientific literature by the American Psychiatric Association in the  third edition o

VASCULAR PLANTS., WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

What do you mean by hemodialysis, Q. What do you mean by hemodialysis? ...

Q. What do you mean by hemodialysis? Hemodialysis is the artificial blood filtration made by specific machines in alternative of the kidneys. Hemodialysis may be necessary in p

Volvox, what is the necessity of interdependence of a volvox organism in th...

what is the necessity of interdependence of a volvox organism in the colonial existence?

Phylum annelida to arthropods, Q. What is the morphological characteristic ...

Q. What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods? The metameric feature that is the body segmentatio

Similarities between chlorplasts and prokaryotic cells, What are the simila...

What are the similarities between chlorplasts and prokaryotic cells?

Extracellular aging, Extracellular Aging The basic components of extra...

Extracellular Aging The basic components of extracellular space are mucopolysaccharides and fibrous proteins, particularly collagen and elastin. These proteins are synthesised

Difference between parental gametes and recombinant gametes, In genetic rec...

In genetic recombination by crossing over what is the difference between parental gametes and recombinant gametes? The Parental gametes are those gametes that maintain the orig

Soil – plant – animal relationship, Soil – plant – animal relationship ...

Soil – plant – animal relationship The plants derive the minerals from soil, and the animals from the plants / feed they consume and there is a dependent interrelationship bet

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