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  2. Fragment crystallizable region - Wikipedia

    en.wikipedia.org/wiki/Fragment_crystallizable_region

    An antibody digested by papain yields three fragments, two Fab fragments and one Fc fragment An antibody digested by pepsin yields two fragments: a F(ab') 2 fragment and a pFc' fragment The fragment crystallizable region ( Fc region ) is the tail region of an antibody that interacts with cell surface receptors called Fc receptors and some ...

  3. Organization and expression of immunoglobulin genes

    en.wikipedia.org/wiki/Organization_and...

    Antibody (or immunoglobulin) structure is made up of two heavy-chains and two light-chains.These chains are held together by disulfide bonds.The arrangement or processes that put together different parts of this antibody molecule play important role in antibody diversity and production of different subclasses or classes of antibodies.

  4. Antibody - Wikipedia

    en.wikipedia.org/wiki/Antibody

    Each antibody binds to a specific antigen in a highly specific interaction analogous to a lock and key.. An antibody (Ab) or immunoglobulin (Ig) is a large, Y-shaped protein belonging to the immunoglobulin superfamily which is used by the immune system to identify and neutralize antigens such as bacteria and viruses, including those that cause disease.

  5. Framework region - Wikipedia

    en.wikipedia.org/wiki/Framework_region

    The antibody has a three-dimensional structure with beta pleated sheet and alpha helices. [5] The antibody folds so the variable regions form three loops with the framework regions folded into one another and the CDR regions on the tips of each of these loops in direct contact with the antigen.

  6. Complementarity-determining region - Wikipedia

    en.wikipedia.org/wiki/Complementarity...

    The loops, or three-dimensional structures of the non-H3 CDRs (all CDRs but H3) of antibodies have been clustered and classified by Chothia et al. [6] and more recently by North et al. [7] Homology modeling is a computational method to build tertiary structures from amino-acid sequences. The so-called H3-rules are empirical rules to build ...

  7. Fragment antigen-binding region - Wikipedia

    en.wikipedia.org/wiki/Fragment_antigen-binding...

    The fragment antigen-binding region (Fab region) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain . The variable domain contains the paratope (the antigen-binding site), comprising a set of complementarity-determining regions , at the amino ...

  8. Isotype (immunology) - Wikipedia

    en.wikipedia.org/wiki/Isotype_(immunology)

    The pentameric structure of IgM antibodies makes them efficient at binding antigens with repetitive epitopes (e.g. bacterial capsule, viral capsid) and activation of complement cascade. As IgM antibodies are expressed early in a B cell response, they are rarely highly mutated and have broad antigen reactivity thus providing an early response to ...

  9. Paratope - Wikipedia

    en.wikipedia.org/wiki/Paratope

    Antibody crystallizable region (Fc) 3. Heavy chains 4. Light chains 5. Variable region of the antibody. The paratope is the key-shaped section that makes direct contact with the antigen. [1] 6. Hinge regions . In immunology, a paratope, also known as an antigen-binding site, is the part of an antibody which recognizes and binds to an antigen.

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