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J Mol Biol. 1991 Dec 20;222(4):835-41.

Cysteine residue periodicity is a conserved structural feature of variable surface proteins from Paramecium tetraurelia.

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1
Department of Biochemistry, Purdue University, West Lafayette, IN 47907.

Abstract

The DNA sequences of the entire coding regions of the A and C type variable surface protein genes from Paramecium tetraurelia, stock 51 have been determined. The 8151 nucleotide open reading frame of the A gene contains several tandem repeats of 210 nucleotides within the central portion of the molecule as well as a periodic structure defined by cysteine residues. The 6699 nucleotide open reading frame of the C gene does not contain any identifiable tandem repeats or internal similarity but maintains a periodicity based on the cysteine residue spacing. The deduced amino acid sequences encoded by the two genes are most similar within the 600 amino-terminal and 600 carboxyl-terminal amino acid residues, the central portions show only limited sequence similarity. We conclude that internal repeats are not a conserved feature of variable surface proteins in Paramecium and discuss the possible importance of the regular pattern of cysteine residues.

PMID:
1762150
[Indexed for MEDLINE]
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