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. 1991 Dec;173(23):7673–7683. doi: 10.1128/jb.173.23.7673-7683.1991

Sequence analysis of the clpG gene, which codes for surface antigen CS31A subunit: evidence of an evolutionary relationship between CS31A, K88, and F41 subunit genes.

J P Girardeau 1, Y Bertin 1, C Martin 1, M Der Vartanian 1, C Boeuf 1
PMCID: PMC212536  PMID: 1938963

Abstract

The clpG gene coding for the CS31A subunit was localized on a 0.9-kb SphI fragment from the recombinant plasmid pAG315. This was established by testing the ability of subclones to hybridize with a 17-meric oligonucleotide probe obtained from N-terminal analysis of the CS31A subunit. The nucleotide sequence of the region coding for CS31A was determined. From primer extension analysis, two initiation translation start sites were detected. Two possible promoterlike sequences were identified; the ribosome binding site and the translation terminator are proposed. Inverted repeat sequences leading to the formation of possible hairpin structures of the transcripts were found on the 5' untranslated region of clpG. The deduced amino acid composition was in close agreement with the chemical amino acid composition and sequence match with the first 25 N-terminal amino acids from the published N-terminal sequence of the purified CS31A subunit. The clpG gene codes for a mature protein of 257 amino acids with a molecular size of 26,777 Da. An obvious homology was observed when the amino acid sequence of CS31A was compared with those of K88 and F41. This homology includes five different conserved sequences of up to 19 identical amino acids, which is associated with conserved proline. An extensive change in the CS31A region homologous to that identified to contain the K88 receptor binding site might be responsible for the functional divergence between CS31A and K88.

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Selected References

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