Absorption of amino acids and peptides, Biology

Assignment Help:

Absorption of amino acids and  peptides

Generally,  the  dietary proteins are almost comp!etely  digested to their constituent amino acids and these are rapidly absorbed  from  the intestine into the portal blood. Some of the dipeptides are hydrolyzed by peptidases  located in  the absorptive cells so  that only amino acids  are  released  into  the  portal blood.  D-amino acids are absorbed by  simple diffusion but the L-amino  acids (occurring  in  foods) require a carrier system in  the absorption.

The inechanism by which amino acids are absorbed is conceptually identical to that of monosaccharides. The  luminal plasma membrane of the absorptive cell bears  at least  four sodium-dependent amino  acid  transporters (one each  for  acidic,  basic, neutral  and aromatic amino acids). Each system transports amino acids that  are  structurally similar. These transporters bind  amino acids only after binding sodium. The fully  loaded  transporter  then  undergoes  a conformational change that dumps sodium and  the amino acid  into the cytoplasm, followed by  its reorientation back  to  the original  form. Thus, absorption of amino acids  is also absolutely dependent on the electrochemical gradient of sodium across the epithelium. The energy dependent carrier  system  also  involves  vitamin  B6 (pyridoxal phosphate) during the transport of amino acids.

 


Related Discussions:- Absorption of amino acids and peptides

Which term explains to pituitary gland, In studies of human body, which of ...

In studies of human body, which of the subsequent terms can also be used when referring to the pituitary gland? Is it: a) Pancreas b) Hypozthesis (pron: hypo-fi-sis) c) T

Types of ecosystem, Types of Ecosystem Basically ecosystems are of two ...

Types of Ecosystem Basically ecosystems are of two types : terrestrial and aquatic. If you travel from plains to the mountains in the Himalayas, you notice significant changes

Senescence, Senescence Plants begin their development after seed germi...

Senescence Plants begin their development after seed germination. They grow, flower and finally senesce and die. The period from the start to death is called the longevity or

When staphylococcal occur, Staphylococci exist in air, dust, sewage, water,...

Staphylococci exist in air, dust, sewage, water, milk and food or on food equipment, environmental surfaces, humans and animals. Humans and animals are the primary reservoirs. Stap

What is knot tying, What is Knot tying Once the suture is satisfactoril...

What is Knot tying Once the suture is satisfactorily placed, it must be secured with a knot. The instrument tie is used most commonly in cutaneous surgery. The square knot is t

Cardiac muscles, CARDIAC MUSCLES - The cardiac muscles are found in ...

CARDIAC MUSCLES - The cardiac muscles are found in the wall of the heart and in the wall of large veins (e.g., pulmonary veins and superior vena cava) where these veins en

Zoology, right classification of protozoa up to class

right classification of protozoa up to class

What are some examples of interspecific competition, What are some examples...

What are some examples of interspecific competition? Examples of interspecific competition are: the dispute between vultures, worms, flies and microorganisms for carrion and th

Botany, Suggest a mechanism that would allow a plant to grow better if it h...

Suggest a mechanism that would allow a plant to grow better if it had intermorph neighbors than if it had intramorph neighbors. Think about the degree of genetic similarity between

Define hepatic triglyceride synthesis, Q. Define Hepatic Triglyceride Synth...

Q. Define Hepatic Triglyceride Synthesis? Fatty acid flux to the liver from adipose tissue appears to be an important determinant of hepatic triglyceride synthesis and VLDL sec

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