PDB file 1BDO
This structure of the biotinyl domain of Acetyl-CoA Carboxylase was solved by F. K. Athapilly & W. A. Hendrickson.
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What secondary structure predominates in this protein?
Biotin: Select hetero-ligand
(or btn), display as ball
& sticks & color CPK.
Compare to the structure of biotin below.
Identify the N of the ureido group of the biotin ring that is the site of carboxylation.
To visualize the lysine that attaches biotin to the enzyme, select lys122, and display as ball & sticks with color CPK.
What is the significance of the long flexible arm that tethers the biotin ring to the enzyme, consisting of the combined side-chains of biotin and lysine?
The amide bond between biotin and lysine does not show in ball & sticks display, since it is a non-standard linkage. Biotin and lysine will look more connected if you display them both in spacefill.
The sequence that designates a lysine residue for attachment of biotin is highly conserved among biotin-utilizing
What type of amino acid is found on either side of the biotin-linked lys122?
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