Core mutations of Synechococcus sp. PCC 7002 phycobilisomes: A spectroscopic study

Yvonne M. Gindt, Jianhui Zhou, Donald A. Bryant, Kenneth Sauer

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Three cyanobacterial strains harboring mutations affecting phycobilisome (PBS) cores were studied using steady state absorption and fluorescence and time-resolved fluorescence. The apcF mutant, missing β18, and the apcDF mutant, missing both αAPB and β18P, showed only small spectroscopic differences from the wild-type strain; their PBS emission was blue shifted by 10 nm, whereas their absorption spectra and time-resolved fluorescence kinetics were virtually unchanged. The third mutant studied was the apcE/C186S mutant in which the chromophore-binding cysteine-186 in the L99CM polypeptide has been substituted with serine. The apcE/C186S mutant contained a modified chromophore which significantly changed the spectroscopic properties of the PBS complex. The apcE/C186S PBS absorbed more than the wild-type strain at 705 nm, and the emission spectrum gave two peaks at 660 nm and 715 nm. The time-resolved kinetics of the apcE/C186S mutant PBS were also significantly altered from those of the wild-type strain.

Original languageEnglish (US)
Pages (from-to)75-89
Number of pages15
JournalJournal of Photochemistry and Photobiology, B: Biology
Volume15
Issue number1-2
DOIs
StatePublished - Aug 14 1992

All Science Journal Classification (ASJC) codes

  • Radiation
  • Radiological and Ultrasound Technology
  • Biophysics
  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Core mutations of Synechococcus sp. PCC 7002 phycobilisomes: A spectroscopic study'. Together they form a unique fingerprint.

Cite this