4ayu

From Proteopedia

Structure of N-Acetyl-D-Proline bound to serum amyloid P component

PDB ID 4ayu

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Structural highlights

4ayu is a 5 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.5Å
Ligands:	, , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

SAMP_HUMAN Note=SAP is a precursor of amyloid component P which is found in basement membrane and associated with amyloid deposits.

Function

SAMP_HUMAN Can interact with DNA and histones and may scavenge nuclear material released from damaged circulating cells. May also function as a calcium-dependent lectin.

Publication Abstract from PubMed

Under physiological conditions, the pentameric human plasma protein serum amyloid P component (SAP) binds hexanoyl bis(D-proline) (R-1-{6-[R-2-carboxy-pyrrolidin-1-yl]-6-oxo-hexanoyl}pyrrolidine-2-carboxylic acid; CPHPC) through its D-proline head groups in a calcium-dependent interaction. Cooperative effects in binding lead to a substantial enhancement of affinity. Five molecules of the bivalent ligand cross-link and stabilize pairs of SAP molecules, forming a decameric complex that is rapidly cleared from the circulation by the liver. Here, it is reported that X-ray analysis of the SAP complex with CPHPC and cadmium ions provides higher resolution detail of the interaction than is observed with calcium ions. Conformational isomers of CPHPC observed in solution by HPLC and by X-ray analysis are compared with the protein-bound form. These are discussed in relation to the development of CPHPC to provide SAP depletion for the treatment of amyloidosis and other indications.

Interaction of serum amyloid P component with hexanoyl bis(D-proline) (CPHPC).,Kolstoe SE, Jenvey MC, Purvis A, Light ME, Thompson D, Hughes P, Pepys MB, Wood SP Acta Crystallogr D Biol Crystallogr. 2014 Aug 1;70(Pt 8):2232-40. doi:, 10.1107/S1399004714013455. Epub 2014 Jul 25. PMID:25084341^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kolstoe SE, Jenvey MC, Purvis A, Light ME, Thompson D, Hughes P, Pepys MB, Wood SP. Interaction of serum amyloid P component with hexanoyl bis(D-proline) (CPHPC). Acta Crystallogr D Biol Crystallogr. 2014 Aug 1;70(Pt 8):2232-40. doi:, 10.1107/S1399004714013455. Epub 2014 Jul 25. PMID:25084341 doi:http://dx.doi.org/10.1107/S1399004714013455