1972
DOI: 10.1128/am.24.4.669-670.1972
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Comparison of Streptococcal R Antigens

Abstract: At least four distinct nonspecific protein R antigens were found in streptococci of groups A, B, and C by immunodiffusion in agar gel with anti-R sera.

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Cited by 39 publications
(6 citation statements)
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“…The R4 protein has been shown to be identical to Rib and is encoded by the rib gene (15), while R5 has been renamed group B protective surface protein (BPS) and was shown to be the gene product of sar5 (13, 16). The R3 protein has been characterized to some extent (12, 1719), and has proved useful as a serosubtype GBS marker (20, 21). However, the gene encoding the R3 protein is still unknown (Table 1).…”
Section: Introductionmentioning
confidence: 99%
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“…The R4 protein has been shown to be identical to Rib and is encoded by the rib gene (15), while R5 has been renamed group B protective surface protein (BPS) and was shown to be the gene product of sar5 (13, 16). The R3 protein has been characterized to some extent (12, 1719), and has proved useful as a serosubtype GBS marker (20, 21). However, the gene encoding the R3 protein is still unknown (Table 1).…”
Section: Introductionmentioning
confidence: 99%
“…Another, and overlapping, classification system of GBS surface proteins is the Streptococcal R proteins first described in 1952 (10), which are resistant to trypsin digestion (thereby designated "R"). R proteins are categorized into five types, R1-5 (11)(12)(13). R1 is probably non-existent as a distinct protein; the antiserum raised against R1 was later shown to recognize the identical N-termini of Alp2 and Alp3, the gene products of alp2 and alp3, respectively (14).…”
Section: Introductionmentioning
confidence: 99%
“…Another, and overlapping, classification system of GBS surface proteins is the Streptococcal R proteins first described in 1952 [12], which are resistant to trypsin digestion (thereby designated "R"). R proteins are categorized into five types, R1-5 [13][14][15]. R1 is probably non-existent as a distinct protein; the antiserum raised against R1 was later shown to recognize the identical N-termini of Alp2 and Alp3, the gene products of alp2 and alp3, respectively [16].…”
Section: Introductionmentioning
confidence: 99%
“…The R4 protein has been shown to be identical to Rib and is encoded by the rib gene [17], while R5 has been renamed group B protective surface protein (BPS) and was shown to be the gene product of sar5 [15,18]. The R3 protein has been characterized to some extent [14,[19][20][21], and has proved useful as a serosubtype GBS marker [22,23]. However, the gene encoding the R3 protein is still unknown (Table 1).…”
Section: Introductionmentioning
confidence: 99%
“…Streptococcus agalactiae (group B streptococci; GBS) can be classified into nine serotypes on the basis of the capsular polysaccharide antigens, i.e., Ia, Ib and II-VIII. Any of the capsular serotypes may be further subtyped on the basis of surface-anchored and strainvariable protein antigens, including the c proteins c alpha (c AE ) and c beta (c â ), and the R proteins R1-R4 [1,2]. The combination of capsular polysaccharide and protein antigen typing allows subdivision of GBS into a large number of serovariants [1], which is important in epidemiological studies of GBS infections.…”
Section: Introductionmentioning
confidence: 99%