Protein composition of the photosystem II core complex in genetically engineered mutants of the cyanobacterium Synechocystis sp. PCC 6803

Willem Vermaas, M. Ikeuchi, Y. Inoue

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The presence of four photosystem II proteins, CP47, CP43, D1 and D2, was monitored in mutants of Synechocystis sp. PCC 6803 that have modified or inactivated genes for CP47, CP43, or D2. It was observed that: (1) thylakoids from mutants without a functional gene encoding CP47 are also depleted in D1 and D2; (2) inactivation of the gene for CP43 leads to decreased but significant levels of CP47, D1 and D2; (3) deletion of part of both genes encoding D2, together with deletion of part of the CP43-encoding gene causes a complete loss of CP47 and D1; (4) thylakoids from a site-directed mutant in which the His-214 residue of D2 has been replaced by asparagine do not contain detectable photosystem II core proteins. However, in another site-directed mutant, in which His-197 has been replaced by tyrosine, some CP47 as well as breakdown products of CP43, but no D1 and D2, can be detected. These data could indicate a central function of CP47 and D2 in stable assembly of the photosystem II complex. CP43, however, is somewhat less critical for formation of the core complex, although CP43 is required for a physiologically functional photosystem II unit. A possible model for the assembly of the photosystem II core complex is proposed.

Original languageEnglish (US)
Pages (from-to)97-113
Number of pages17
JournalPhotosynthesis Research
Volume17
Issue number1-2
DOIs
StatePublished - Jul 1988
Externally publishedYes

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Synechocystis sp. PCC 6803
Synechocystis
Photosystem II Protein Complex
protein composition
Cyanobacteria
photosystem II
Gene encoding
mutants
Chemical analysis
Thylakoids
Proteins
genes
thylakoids
Genes
Asparagine
Gene Silencing
asparagine
Tyrosine
tyrosine
inactivation

Keywords

  • directed mutagenesis
  • photosynthesis
  • Photosystem II proteins
  • protein complex assembly
  • protein function

ASJC Scopus subject areas

  • Plant Science

Cite this

Protein composition of the photosystem II core complex in genetically engineered mutants of the cyanobacterium Synechocystis sp. PCC 6803. / Vermaas, Willem; Ikeuchi, M.; Inoue, Y.

In: Photosynthesis Research, Vol. 17, No. 1-2, 07.1988, p. 97-113.

Research output: Contribution to journalArticle

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