Molecular and General Genetics MGG

, Volume 218, Issue 2, pp 229–239

Structure and expression of the gene encoding the periplasmic arylsulfatase of Chlamydomonas reinhardtii

  • Eugenio L. de Hostos
  • James Schilling
  • Arthur R. Grossman

DOI: 10.1007/BF00331273

Cite this article as:
de Hostos, E.L., Schilling, J. & Grossman, A.R. Molec Gen Genet (1989) 218: 229. doi:10.1007/BF00331273


Chlamydomonas reinhardtii produces a periplasmic arylsulfatase in response to sulfur deprivation. We have isolated and sequenced arylsulfatase cDNAs from a λ gt11 expression library. The amino acid sequence of the protein, as deduced from the nucleotide sequence, has features characteristic of secreted proteins, including a signal sequence and putative glycosylation sites. The gene has a broad codon usage with seven codons, all having A residues in the third position, not previously observed in C. reinhardtii genes. Arylsulfatase transcription is tightly regulated by sulfur availability. The ∼2.7 kb arylsulfatase transcript is very susceptible to degradation, disappearing in less than an hour after sulfur starved cells are administered either sulfate or α-amanitin. The accumulation of the arylsulfatase transcript is also suppressed by the addition of cycloheximide. Transcription initiation from the arylsulfatase gene occurs ∼ 100 bp upstream of the initiation codon, in a region that is 5′ to a 43 bp imperfect inverted repeat. Preceding the transcription start site are sequences similar to those present in promoter regions of other genes from C. reinhardtii.

Key words

ClamydomonasArylsulfataseλ gt11Codon usageSulfate regulation

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Eugenio L. de Hostos
    • 1
  • James Schilling
    • 2
  • Arthur R. Grossman
    • 3
  1. 1.Department of Biological SciencesStanford UniversityStanfordUSA
  2. 2.California BiotechnologyMountain ViewUSA
  3. 3.Department of Plant BiologyCarnegie Institution of WashingtonStanfordUSA
  4. 4.Abteilung ZellbiologieMax Planck Institut für BiochemieMartinsriedFederal Republic of Germany