1ee2
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THE STRUCTURE OF STEROID-ACTIVE ALCOHOL DEHYDROGENASE AT 1.54 A RESOLUTION
OverviewOverview
A structure determination in combination with a kinetic study of the, steroid converting isozyme of horse liver alcohol dehydrogenase, SS-ADH, is presented. Kinetic parameters for the substrates, 5beta-androstane-3beta,17beta-ol, 5beta-androstane-17beta-ol-3-one, ethanol, and various secondary alcohols and the corresponding ketones are, compared for the SS- and EE-isozymes which differ by nine amino acid, substitutions and one deletion. Differences in substrate specificity and, stereoselectivity are explained on the basis of individual kinetic rate, constants for the underlying ordered bi-bi mechanism. SS-ADH was, crystallized in complex with 3alpha,7alpha,12alpha-trihydroxy-5beta-cholan, -24-acid (cholic acid) and NAD(+), but microspectrophotometric analysis of, single crystals proved it to be a mixed complex containing 60-70% NAD(+), and 30-40% NADH. The crystals belong to the space group P2(1) with cell, dimensions a = 55.0 A, b = 73.2 A, c = 92.5 A, and beta = 102.5 degrees. A, 98% complete data set to 1.54-A resolution was collected at 100 K using, synchrotron radiation. The structure was solved by the molecular, replacement method utilizing EE-ADH as the search model. The major, structural difference between the isozymes is a widening of the substrate, channel. The largest shifts in C(alpha) carbon positions (about 5 A) are, observed in the loop region, in which a deletion of Asp115 is found in the, SS isozyme. SS-ADH easily accommodates cholic acid, whereas steroid, substrates of similar bulkiness would not fit into the EE-ADH substrate, site. In the ternary complex with NAD(+)/NADH, we find that the carboxyl, group of cholic acid ligates to the active site zinc ion, which probably, contributes to the strong binding in the ternary NAD(+) complex.
About this StructureAbout this Structure
1EE2 is a Single protein structure of sequence from Equus caballus with ZN, NAD and CHD as ligands. Active as Alcohol dehydrogenase, with EC number 1.1.1.1 Full crystallographic information is available from OCA.
ReferenceReference
Structural basis for substrate specificity differences of horse liver alcohol dehydrogenase isozymes., Adolph HW, Zwart P, Meijers R, Hubatsch I, Kiefer M, Lamzin V, Cedergren-Zeppezauer E, Biochemistry. 2000 Oct 24;39(42):12885-97. PMID:11041853
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