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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Science. 2020 Jun 19;368(6497):1381–1385. doi: 10.1126/science.aaz6748

Fig. 4. The M-clusters in Av1*(TOD).

Fig. 4.

Structures of M-clusters in (A, B) Chain-A (M-cluster(A)) and (C, D) Chain-C (M-cluster(C)) refined at a resolution of 1.73 Å. Side view of (A) M-cluster(A) and (C) M-cluster(C) with key residues interacting with the clusters and the bound nitrogen ligands indicated as sticks. M-cluster(A) and M-cluster(C) are superimposed with the Fo-Fc omit maps of the belt sulfurs contoured at 13 σ (mint-blue mesh). View along the Fe1-C-Mo direction of (B) M-cluster(A) and (D) M-cluster(C) superimposed with the anomalous density maps calculated at 7100 eV at a resolution of 2.17 Å and contoured at 4.0 σ, showing the presence of the anomalous sulfur density (mint-blue mesh) at all belt sulfur positions (S2B, S3A and S5A) in (B) M-cluster(A) and (D) M-cluster(C). The peptides and atoms are colored as those in Fig. 1.