I deliberately focused on the comparison of sequentially related CYP, which is easier to find subtle differences in the analogies. ie, CYP2C8 and 2C9, CYP3A4 (1TQN and 2J0D).
SOLVATATION CHANNEL
Fig. 9 CYP2C: identity of residues GLU 300, ARG 307, ASP 165. Reverse polarity ARG 206 (2C8) and Glu 206 (2C9). LYS 199 is deflected from solvation channel. |
Fig. 10 CYP3A: Identity ASP 174, LYS 173, GLU 163, LYS 168 (1TQN) - ARG 162 (2J0D) and helix F LYS 208. Replacement GLU 205 and LYS 209. LYS 487 (2J0D) makes a distant edge of the channel. |
Fig. 11 CYP 2A6: a common positively charged region, LYS 476, HIS 477 (or ARG 311) with CYP1A2: LYS 500, HIS 501, ARG 503 (Fig. 12). Some of the CYP2A6 residues correspond to residues of other cytochromes: ARG 203 ≈ LYS 208, LYS 209 (2J0D), ARG 206 (2C8); ARG 311 ≈ ARG 307 (2C). |
Fig. 12 In addition to CYP1A2, appears in all cytochromes a negatively charged residue at the beginning of helix E: 2C8, 2C9 - ASP 165, 3A4 - ASP 174, 2A6 - ASP 163, 2D6 - ASP 169. |
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