immunoglobulin G
immunoglobulin im`mu*no*glob"ulin ([i^]m`m[-u]*n[-o]*gl[o^]b"[-u]*l[i^]n) n. (1953) any one of a class of globular proteins which are antibodies and are produced by the immune system in animals.

Note: The immunoglobulins form a series of related proteins which are each composed of two pairs of polypeptide chains, called heavy (H) and light (L, meaning of lower molecular weight), all linked together by disulfide bonds. They are subdivided on the basis of the structural and antigenic properties of the H chains into four subgroups, {immunoglobulin G} (IgG), {immunoglobulin A} (IgA), {immunoglobulin M} (IgM), and {immunoglobulin D} (IgD). They are divided also into subclasses. Both H and L chains of anny given class and subclass have regions which are of constant structure within that class, as well as regions which are of variable structure. The variable regions impart the ability to recognize and bind to specific molecular structures, thus providing the organism the capacity to recognize and defend itself against the harmful effects of substances foreign to the body. --Stedman

Syn: Ig. [PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Immunoglobulin G — (IgG) is a monomeric immunoglobulin, built of two heavy chains γ and two light chains. Each IgG has two antigen binding sites. It is the most abundant immunoglobulin and is approximately equally distributed in blood and in tissue liquids,… …   Wikipedia

  • Immunoglobulin G — Abbreviated IgG. A major class of immunoglobulins found in the blood, including many of the most common antibodies circulating in the blood. Also known as gamma globulin. * * * immunoglobulin G n IGG …   Medical dictionary

  • immunoglobulin G — noun one of the five major classes of immunoglobulins; the main antibody defense against bacteria • Syn: ↑IgG • Hypernyms: ↑immunoglobulin, ↑Ig, ↑immune serum globulin, ↑immune gamma globulin, ↑immune globulin * * * …   Useful english dictionary

  • Immunoglobulin G — räumliche Darstellung eines IgG Antikörpers Immunglobulin G (IgG) oder Gammaglobulin ist ein Glykoprotein, das von B Lymphozyten bzw. Plasmazellen nach Kontakt mit einem Antigen produziert wird. IgGs sind die Antikörper (Immunglobuline) der… …   Deutsch Wikipedia

  • Fcγ R fragment receptor for immunoglobulin G — faculty contact hour; family care home; fetal cystic hygroma …   Medical dictionary

  • Immunoglobulin A — (IgA) is an antibody playing a critical role in mucosal immunity. More IgA is produced in mucosal linings than all other types of antibody combined. [cite journal |author=S Fagarasan and T Honjo |title=Intestinal IgA Synthesis: Regulation of… …   Wikipedia

  • immunoglobulin — im mu*no*glob ulin ([i^]m m[ u]*n[ o]*gl[o^]b [ u]*l[i^]n) n. (1953) any one of a class of globular proteins which are antibodies and are produced by the immune system in animals. Note: The immunoglobulins form a series of related proteins which… …   The Collaborative International Dictionary of English

  • immunoglobulin A — immunoglobulin im mu*no*glob ulin ([i^]m m[ u]*n[ o]*gl[o^]b [ u]*l[i^]n) n. (1953) any one of a class of globular proteins which are antibodies and are produced by the immune system in animals. Note: The immunoglobulins form a series of related… …   The Collaborative International Dictionary of English

  • immunoglobulin D — immunoglobulin im mu*no*glob ulin ([i^]m m[ u]*n[ o]*gl[o^]b [ u]*l[i^]n) n. (1953) any one of a class of globular proteins which are antibodies and are produced by the immune system in animals. Note: The immunoglobulins form a series of related… …   The Collaborative International Dictionary of English

  • immunoglobulin M — immunoglobulin im mu*no*glob ulin ([i^]m m[ u]*n[ o]*gl[o^]b [ u]*l[i^]n) n. (1953) any one of a class of globular proteins which are antibodies and are produced by the immune system in animals. Note: The immunoglobulins form a series of related… …   The Collaborative International Dictionary of English

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”