*2.4. LYR Family Subunits*

Two subunits from the LYR family are described next: NDUFA6 and NDUFB9, as shown in Figure 8. These proteins have the LYR sequence motif, which helps them bind to one of the two acyl carrier proteins, NDUFAB1. They also bind the substrate 4′ -phosphopantethiene for the acyl carrier proteins. They are found on the matrix side of the membrane arm. ′‐ ′‐

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**Figure 8.** Location of NDUFA6 and NDUFB9. Most of Complex I is colored gray. They are shown in ribbons, with NDUFA6 colored yellow and NDUFB9 colored lime. The two views are rotated 180◦ relative to each other. The structure is from PDB id = 5xtd [9].
