Biomaterial Database

An M-associated protein antigen (MAP) of group A streptococci. 1971

J P Widdowson, and W R Maxted, and A M Pinney

A streptococcal antigen that is closely associated with the M-antigen, but is not type specific can be detected by means of a complement-fixation test in extracts of M-positive, but not of M-negative, variants of group A streptococci. Purification of acid extracts results in a concomitant increase in the purity both of the type-specific M-antigen and of the M-associated protein (MAP). Antibody to MAP is present in the sera of patients who have had streptococcal infection. The highest titres are found in patients with rheumatic fever.

UI	MeSH Term	Description	Entries
D010447	Peptide Hydrolases	Hydrolases that specifically cleave the peptide bonds found in PROTEINS and PEPTIDES. Examples of sub-subclasses for this group include EXOPEPTIDASES and ENDOPEPTIDASES.	Peptidase,Peptidases,Peptide Hydrolase,Protease,Proteases,Proteinase,Proteinases,Proteolytic Enzyme,Proteolytic Enzymes,Esteroproteases,Enzyme, Proteolytic,Hydrolase, Peptide
D003168	Complement Fixation Tests	Serologic tests based on inactivation of complement by the antigen-antibody complex (stage 1). Binding of free complement can be visualized by addition of a second antigen-antibody system such as red cells and appropriate red cell antibody (hemolysin) requiring complement for its completion (stage 2). Failure of the red cells to lyse indicates that a specific antigen-antibody reaction has taken place in stage 1. If red cells lyse, free complement is present indicating no antigen-antibody reaction occurred in stage 1.	Complement Absorption Test, Conglutinating,Conglutination Reaction,Conglutinating Complement Absorption Test,Complement Fixation Test,Conglutination Reactions,Fixation Test, Complement,Fixation Tests, Complement,Reaction, Conglutination,Reactions, Conglutination,Test, Complement Fixation,Tests, Complement Fixation
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000941	Antigens	Substances that are recognized by the immune system and induce an immune reaction.	Antigen
D000942	Antigens, Bacterial	Substances elaborated by bacteria that have antigenic activity.	Bacterial Antigen,Bacterial Antigens,Antigen, Bacterial
D012213	Rheumatic Fever	A febrile disease occurring as a delayed sequela of infections with STREPTOCOCCUS PYOGENES. It is characterized by multiple focal inflammatory lesions of the connective tissue structures, such as the heart, blood vessels, and joints (POLYARTHRITIS) and brain, and by the presence of ASCHOFF BODIES in the myocardium and skin.	Acute Rheumatic Fever,Arthritis, Rheumatic, Acute,Rheumatism, Articular, Acute,Arthritis, Acute Rheumatic,Inflammatory Rheumatism,Polyarthritis Rheumatica,Rheumatic Arthritis,Rheumatism, Acute Articular,Acute Articular Rheumatism,Acute Articular Rheumatisms,Acute Rheumatic Arthritides,Acute Rheumatic Arthritis,Acute Rheumatic Fevers,Arthritis, Rheumatic,Articular Rheumatism, Acute,Fever, Acute Rheumatic,Fever, Rheumatic,Fevers, Acute Rheumatic,Inflammatory Rheumatisms,Polyarthritis Rheumaticas,Rheumatic Arthritides,Rheumatic Arthritis, Acute,Rheumatic Fever, Acute,Rheumatic Fevers,Rheumatism, Inflammatory
D013290	Streptococcal Infections	Infections with bacteria of the genus STREPTOCOCCUS.	Group A Strep Infection,Group A Streptococcal Infection,Group A Streptococcal Infections,Group B Strep Infection,Group B Streptococcal Infection,Group B Streptococcal Infections,Infections, Streptococcal,Infection, Streptococcal,Streptococcal Infection
D013291	Streptococcus	A genus of gram-positive, coccoid bacteria whose organisms occur in pairs or chains. No endospores are produced. Many species exist as commensals or parasites on man or animals with some being highly pathogenic. A few species are saprophytes and occur in the natural environment.

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