Studies on the light-harvesting complexes from the thermotolerant purple bacterium Rhodopseudomonas cryptolactis.

ABSTRACT

The antenna complexes from Rps. cryptolactis have been isolated and purified. Rps. cryptolactis contains two types of variable antenna complex, B800-850 and B800-820 as well as the 'core' B875 antenna complex. The variable antenna complexes contain more than two types of antenna apoprotein, and have a Bchlacarotenoid ratio of ∼21. They can both be crystallised, but the B800-820 complex is the easiest with which to get relatively large single 3-D crystals (up to 0.5 mm in each dimension).