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Purification and partial characterization of canine S100A12.

Abstract：

:Canine S100A12 (cS100A12) is a calcium-binding protein of the S100 superfamily of EF-hand proteins, and its expression is restricted to neutrophils and monocytes. Interaction of S100A12 with the receptor for advanced glycation end products (RAGE) has been suggested to play a central role in inflammation. Moreover, S100A12 has been shown to represent a sensitive and specific marker for gastrointestinal inflammation in humans. Only human, porcine, bovine, and rabbit S100A12 have been purified to date, and an immunoassay for the quantification of S100A12 is available only for humans. Therefore, the aim of this study was to develop a protocol for the purification of S100A12 and to partially characterize this protein in the dog (Canis lupus familiaris) as a prelude to the development of an immunologic method for its detection and quantification in canine serum and fecal specimens. Leukocytes were isolated from canine whole blood by dextran sedimentation, and canine S100A12 was extracted from the cytosol fraction of these cells. Further purification of cS100A12 comprised of ammonium sulfate precipitation, hydrophobic interaction chromatography, and strong cation- and anion-exchange column chromatography. Canine S100A12 was successfully purified from canine whole blood. The relative molecular mass of the protein was estimated at 10,379.5 and isoelectric focusing revealed an isoelectric point of 6.0. The approximate specific absorbance of cS100A12 at 280 nm was determined to be 1.78 for a 1 mg/ml solution. The N-terminal AA sequence of the first 15 residues of cS100A12 was Thr-Lys-Leu-Glu-Asp-His-X-Glu-Gly-Ile-Val-Asp-Val-Phe-His, and revealed 100% identity with the predicted protein sequence available through the canine genome project. Sequence homology for the 14 N-terminal residues identified for cS100A12 with those of feline, bovine, porcine, and human S100A12 was 78.6%. We conclude that canine S100A12 can be successfully purified from canine whole blood using the described methods.

journal_name

Biochimie

journal_title

Biochimie

authors

Heilmann RM,Suchodolski JS,Steiner JM

doi

10.1016/j.biochi.2010.08.007

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

1914-22

issue

12

eissn

0300-9084

issn

1638-6183

pii

S0300-9084(10)00290-7

journal_volume

92

pub_type

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