Abstract
Electron microscopic observation of spiroplasmas lysed by detergent (sodium deoxycholate) revealed the release of bundles of fibrils from the cells. Individual fibrils are 4 nm in diameter and possess a 9-nm periodicity along their length. These fibrils are thought to function as cytoskeletal structures involved in the shape and motility of spiroplasmas. Polyacrylamide gel electrophoresis of density gradient-purified fibrils showed a protein of approximately 55 kDa. Oligonucleotide probes were constructed from the N-terminal amino acid sequence of two peptides obtained after V8 protease hydrolysis of the fibril protein. The probes were used to identify the clones in a genomic DNA library of Spiroplasma citri that contained inserts carrying the probe sequence. Sequencing of a 3.3-kbp fragment yielded the full open reading frame of the fibril protein gene and the start of a second open reading frame of an unknown protein. The fibril protein is composed of 515 amino acids, which have a computed molecular mass of 59 kDa. Northern (RNA) blot hybridization and primer extension experiments showed that transcription of the fibril protein gene starts from a promoter located 100 nucleotides upstream of the initiation codon and stops at a rho-independent type terminator, leading to a 1.7-kbp transcript. Southern blot hybridization of genomic DNA using the fibril protein gene as the probe showed that a single copy of the gene is present in the chromosomes of both S. citri and Spiroplasma melliferum. The genotypic symbol fib is proposed for the spiroplasma fibril protein gene.
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Dates
Type | When |
---|---|
Created | 8 years, 9 months ago (Nov. 7, 2016, 11:33 a.m.) |
Deposited | 4 years, 1 month ago (July 29, 2021, 1:52 p.m.) |
Indexed | 3 months, 1 week ago (May 27, 2025, 9:18 p.m.) |
Issued | 34 years, 2 months ago (July 1, 1991) |
Published | 34 years, 2 months ago (July 1, 1991) |
Published Print | 34 years, 2 months ago (July 1, 1991) |
@article{Williamson_1991, title={Nucleotide sequence of the Spiroplasma citri fibril protein gene}, volume={173}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.173.14.4353-4362.1991}, DOI={10.1128/jb.173.14.4353-4362.1991}, number={14}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Williamson, D L and Renaudin, J and Bové, J M}, year={1991}, month=jul, pages={4353–4362} }