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• W1488004577 abstract "The complete amino acid sequence of PepM49, a peptic fragment of the group A streptococcal type 49 M protein, the antiphagocytic cell surface molecule of the bacteria, is described. This fragment retains the opsonic antibody epitope of the native molecule. The sequence of PepM49, as determined by automated Edman degradations of the uncleaved molecule, and its tryptic and chymotryptic peptides, consists of a total of 143 residues (Mr = 17,187). PepM49, a nephritis-associated M protein serotype, exhibits significant internal homology in its sequence. However, identical sequence repeats of the kind seen in the rheumatic fever-associated serotypes M5, M6, and M24, are absent in PepM49. PepM49 exhibits varying degrees of homology with the M5, M6, and M24 proteins, which is consistent with the existence of variable and conserved regions in the M protein molecule. Predictive analysis as well as CD measurements revealed a high propensity of the PepM49 molecule to assume an alpha-helical conformation. Furthermore, a heptad periodicity of the nonpolar residues, a characteristic of alpha-helical coiled-coil proteins, extends over the entire length of the PepM49 protein. The differences in the nonpolar residue distribution divide the PepM49 sequence into three distinct domains, similar to those seen earlier in the M5 and M6 proteins. Together, these studies establish a conserved conformational design for the sequentially diverse M protein serotypes. However, the pattern of heptad periodicity in the PepM49 protein is quite distinct from that present in the PepM5 and M6 proteins, suggesting distinct differences in structural features among conformationally similar M protein serotypes. This may have relevance to the pathological differences associated with these M protein serotypes." @default.
• W1488004577 created "2016-06-24" @default.
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• W1488004577 date "1988-04-01" @default.
• W1488004577 modified "2023-10-18" @default.
• W1488004577 title "Complete amino acid sequence of streptococcal PepM49 protein, a nephritis-associated serotype. Conserved conformational design among sequentially distinct M protein serotypes." @default.
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• W1488004577 doi "https://doi.org/10.1016/s0021-9258(18)60681-7" @default.
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