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Characteristics of Ca2+-binding and its effects on the LH1 complexes of different purple sulfur bacteria.
| Number of Ca2+ | Ca2+-binding motif | αβ-polypeptide | LH1-Qy (nm) | Ca2+ effect on LH1-Qy | Ca2+ effect on stability | |
|---|---|---|---|---|---|---|
| Alc. vinosum | 6 (partial) | WxxDxV | Multiple | 889 | 2–3 nm | Moderate |
| Alc. tepidum | 6 (partial) | WxxDxI | Multiple | 890 | 8 nm | Moderate |
| Tch. tepidum | 16 (full) | WxxDxI | Single | 915 | 35 nm | Significant |
| Trv. strain 970 | 16 (full) | WxxDxI | Multiple | 959 | 84 nm | Significant |
