Rapid evolutionary divergence of Photosystem I core subunits PsaA and PsaB in the marine prokaryote Prochlorococcus.

Abstract:

:The nucleotide sequences of the genes coding for the subunits of the Photosystem I (PS I) core, PsaA and PsaB were determined for the marine prokaryotic oxyphototrophs Prochlorococcus sp. MED4 (CCMP1378), P. marinus SS120 (CCMP1375) and Synechococcus sp. WH7803. Divergence of these sequences from those of both freshwater cyanobacteria and higher plants was remarkably high, given the conserved nature of PsaA and PsaB proteins. In particular, the PsaA of marine prokaryotes showed several specific insertions and deletions with regard to known PsaA sequences. Even in between the two Prochlorococcus strains, which correspond to two genetically different ecotypes with shifted growth irradiance optima, the sequence identity was only 80.2% for PsaA and 88.9% for PsaB. Possible causes and implications of the fast evolution rates of these two PS I core subunits are discussed.

journal_name

Photosynth Res

journal_title

Photosynthesis research

authors

van der Staay GW,Moon-van der Staay SY,Garczarek L,Partensky F

doi

10.1023/A:1006445810996

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

131-9

issue

2

eissn

0166-8595

issn

1573-5079

journal_volume

65

pub_type

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