2KJ7

Three-Dimensional NMR Structure of Rat Islet Amyloid Polypeptide in DPC micelles

Summary for 2KJ7

• Entry DOI: 10.2210/pdb2kj7/pdb
• Descriptor: Islet amyloid polypeptide (1 entity in total)
• Functional Keywords: iapp, amylin, islet amyloid polypeptide, rat iapp, amidation, amyloid, cleavage on pair of basic residues, disulfide bond, hormone, secreted
• Biological source: Rattus norvegicus (brown rat,rat,rats)
• Cellular location: Secreted: P12969
• Total number of polymer chains: 1
• Total formula weight: 3924.43

Authors

Nanga, R.,Brender, J.R.,Xu, J.,Hartman, K.,Subramanian, V.,Ramamoorthy, A. (deposition date: 2009-05-22, release date: 2009-06-23, Last modification date: 2024-10-16)

Primary citation

Nanga, R.P.,Brender, J.R.,Xu, J.,Hartman, K.,Subramanian, V.,Ramamoorthy, A.
Three-dimensional structure and orientation of rat islet amyloid polypeptide protein in a membrane environment by solution NMR spectroscopy.
J.Am.Chem.Soc., 131:8252-8261, 2009

PubMed Abstract: Islet amyloid polypeptide (IAPP or amylin) is a 37-residue peptide hormone associated with glucose metabolism that is cosecreted with insulin by beta-cells in the pancreas. Since human IAPP is a highly amyloidogenic peptide, it has been suggested that the formation of IAPP amyloid fibers is responsible for the death of beta-cells during the early stages of type II diabetes. It has been hypothesized that transient membrane-bound alpha-helical structures of human IAPP are precursors to the formation of these amyloid deposits. On the other hand, rat IAPP forms transient alpha-helical structures but does not progress further to form amyloid fibrils. To understand the nature of this intermediate state and the difference in toxicity between the rat and human versions of IAPP, we have solved the high-resolution structure of rat IAPP in the membrane-mimicking detergent micelles composed of dodecylphosphocholine. The structure is characterized by a helical region spanning the residues A5 to S23 and a disordered C-terminus. A distortion in the helix is seen at R18 and S19 that may be involved in receptor binding. Paramagnetic quenching NMR experiments indicate that rat IAPP is bound on the surface of the micelle, in agreement with other nontoxic forms of IAPP. A comparison to the detergent-bound structures of other IAPP variants indicates that the N-terminal region may play a crucial role in the self-association and toxicity of IAPP by controlling access to the putative dimerization interface on the hydrophobic face of the amphipathic helix.

PubMed: 19456151
DOI: 10.1021/ja9010095

Experimental method

SOLUTION NMR