Table 2 Characteristics of Ca2+-binding and its effects on the LH1 complexes of different purple sulfur bacteria.

From: High-resolution structure and biochemical properties of the LH1–RC photocomplex from the model purple sulfur bacterium, Allochromatium vinosum

 

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

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