Expression of the Peptidoglycan Recognition Protein, PGRP, in the Lactating Mammary Gland

The peptidoglycan recognition protein, PGRP, known as an intracellular component of neutrophils, has been isolated from camel (Camelus dromedarius) milk by acid precipitation followed by heparin-sepharose affinity chromatography of the supernatant. The mean concentration in milk was about 120mg/L. I...

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Veröffentlicht in:Journal of dairy science 2004-08, Vol.87 (8), p.2660-2668
Hauptverfasser: Kappeler, S.R., Heuberger, C., Farah, Z., Puhan, Z.
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creator Kappeler, S.R.
Heuberger, C.
Farah, Z.
Puhan, Z.
description The peptidoglycan recognition protein, PGRP, known as an intracellular component of neutrophils, has been isolated from camel (Camelus dromedarius) milk by acid precipitation followed by heparin-sepharose affinity chromatography of the supernatant. The mean concentration in milk was about 120mg/L. It decreased during lactation by 19% and increased in the event of severe mastitis by 45%. The protein bound to lactic acid bacteria and other gram-positive bacteria with an affinity similar to that reported for the human and murine orthologs, although the isoelectric point of the molecule was distinctly higher at pH 9.02. The N-terminus of mature camel PGRP was determined as NH2-ArgGluAspProPro-CO2H. Calculated and measured molecular masses were both 19.1kDa, excluding the possibility of posttranslational modifcation or binding of cation ligands. The peptide probably builds a homotrimer at high concentration. The corresponding mRNA was isolated from lactating mammary gland tissue, and 5.3 kbp of the corresponding gene was sequenced. Similarities were found to the camel lactoferrin gene with regard to sites of expression and to the region 5′ upstream to the gene.
doi_str_mv 10.3168/jds.S0022-0302(04)73392-5
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Psychology ; Gene Expression ; gene expression regulation ; Isoelectric Point ; lactating mammary gland ; Lactation ; mammary gland function ; mammary glands ; Mammary Glands, Animal - chemistry ; mastitis ; Micrococcus luteus - metabolism ; Milk - chemistry ; Milk and cheese industries. 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Similarities were found to the camel lactoferrin gene with regard to sites of expression and to the region 5′ upstream to the gene.</abstract><cop>Savoy, IL</cop><pub>Elsevier Inc</pub><pmid>15328291</pmid><doi>10.3168/jds.S0022-0302(04)73392-5</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; ScienceDirect Journals (5 years ago - present)
subjects Amino Acid Sequence
amino acid sequences
Animal productions
Animals
antibacterial properties
Base Sequence
binding proteins
Biological and medical sciences
camel milk
Camelus - genetics
Carrier Proteins - analysis
Carrier Proteins - chemistry
Carrier Proteins - genetics
DNA, Complementary - chemistry
dromedaries
Female
Food industries
Fundamental and applied biological sciences. Psychology
Gene Expression
gene expression regulation
Isoelectric Point
lactating mammary gland
Lactation
mammary gland function
mammary glands
Mammary Glands, Animal - chemistry
mastitis
Micrococcus luteus - metabolism
Milk - chemistry
Milk and cheese industries. Ice creams
Molecular Sequence Data
Molecular Weight
nucleotide sequences
Peptide Fragments - chemistry
peptidoglycan recognition protein
purification
RNA, Messenger - analysis
RNA, Messenger - isolation & purification
Sequence Analysis, DNA
Sequence Analysis, Protein
Staphylococcus aureus - metabolism
Terrestrial animal productions
Vertebrates
title Expression of the Peptidoglycan Recognition Protein, PGRP, in the Lactating Mammary Gland
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