Electrophoresis of proteins

In Protéomique and Medicine, the electrophoresis of the proteins is a method of analysis of a mixture of Protéine S by a electrophoresis on freezing, mainly in the Sérum Sang uin (the Blood plasma is not appropriate).

The electrophoresis is a chemical technique of analysis of the masses of the Molécule S. It rests on the capacity of the buttons charged to migrate through the pores of a gel when an electric current is applied. If one controls the fine Porosité Gel, the molecules will migrate towards the opposite electric pole of their load according to their size.

The Protéine S are amphiphilic molecules (which carry positive and negative loads localized on the side chains of the amino-acids). They adopt characteristic three-dimensional structures and certain loads can be exposed on the surface of the molecule, as it can be hidden in the middle of the molecule. The comparative analysis of the molecular masses thus will be carried out on denatured proteins their tertiary and secondary structures. Detergent of an anion type recovers the chains of Polymère denatured in their conferring a load (report/ratio charges/acid-amino constant). The various proteins of a mixture complexes are thus covered with a " manteau" negative charges. When one applies a tension continues between the ends of a gel where the complex mixture of proteins was deposited, the proteins migrate through the meshs constituting freezing. The meshs of freezing will retain less the small molecules which will have the largest migration then. The longest molecules will be all the more retained between the meshs of freezing and will have a weaker relative migration.

Various processes are used to reveal the migration of proteins. Most current/basic consists of a specific coloring of proteins. Freezing is coloured and it reveals an electrophoretic profile which highlights bands whose intensity partially reflects abundance in the mixture and the position/migration reflects the relative molecular mass. This molecular mass is compared with commercial standards gauged in unit of proteinic mass (Dalton, Da - One expresses the mass of a protein in Da and kDa mainly)

Interpretation

Blood Protein S: Albumin and Globulin . They are generally equal in proportion, goal albumin is much smaller and lightly negatively charged, leading to year accumulation off albumin one the electrophoretic freezing. With small band before Albumin represents Transthyretin (also named Pre-albumin). Summon forms off medication gold body chemicals edge causes to their own band, usually small (see, however, Paraprotein).

The Globulin S are classified by to their banding pattern (with to their representative hand):

  • The alpha (α) band consists off two shares, 1 and 2:
    • α1 - α1-antitrypsin, α1-acid glycoprotein.
    • α2 - Haptoglobin, α2-macroglobulin, α2-antiplasmin, Ceruloplasmin.
  • The beta (β) band - Transferrin, LDL, complement
  • The gamma (γ) band - Immunoglobulin (IgA, IgD, IgE, IgG and IgM). Paraprotein S (in Multiple myeloma) appear in this band.
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