8adh

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spinqualitylabelsall models 8adh, resolution 2.4Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

INTERDOMAIN MOTION IN LIVER ALCOHOL DEHYDROGENASE. STRUCTURAL AND ENERGETIC ANALYSIS OF THE HINGE BENDING MODE

Overview

A study of the hinge bending mode in the enzyme liver alcohol, dehydrogenase is made by use of empirical energy functions. The enzyme is, a dimer, with each monomer composed of a coenzyme binding domain and a, catalytic domain with a large cleft between the two. Superposition of the, apoenzyme and holoenzyme crystal structures is used to determine a rigid, rotation axis for closing of the cleft. It is shown that a rigid body, transformation of the apoenzyme to the holoenzyme structure corresponds to, a 10 degrees rotation of the catalytic domain about this axis. The, rotation is not along the least-motion path for closing of the cleft but, instead corresponds to the catalytic domain coming closer to the coenzyme, binding domain by a sliding motion. Estimation of the energy associated, with the interdomain motion of the apoenzyme over a range of 90 degrees, (-40 to 50 degrees, where 0 degrees corresponds to the minimized crystal, structure) demonstrates that local structural relaxation makes possible, large-scale rotations with relatively small energy increments. A variety, of structural rearrangements associated with the domain motion are, characterized. They involve the hinge region residues that provide the, covalent connections between the two domains and certain loop regions that, are brought into contact by the rotation. Differences between the energy, minimized and the holoenzyme structures point to the existence of, alternative conformations for loops and to the importance of the ligands, in the structural rearrangements.

About this Structure

8ADH is a Single protein structure of sequence from Equus caballus with ZN as ligand. This structure superseeds the now removed PDB entries 4ADH and 3ADH. Active as Alcohol dehydrogenase (acceptor), with EC number 1.1.99.8 Full crystallographic information is available from OCA.

Reference

Interdomain motion in liver alcohol dehydrogenase. Structural and energetic analysis of the hinge bending mode., Colonna-Cesari F, Perahia D, Karplus M, Eklund H, Braden CI, Tapia O, J Biol Chem. 1986 Nov 15;261(32):15273-80. PMID:3771574

Page seeded by OCA on Tue Nov 20 15:09:37 2007