Linked Life Data

15461460

Source:http://linkedlifedata.com/resource/pubmed/id/15461460

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
40
pubmed:dateCreated
2004-10-5
pubmed:abstractText
Human cysteine-rich secretory protein 3 (CRISP-3; also known as SGP28) belongs to a family of closely related proteins found in mammals and reptiles. Some mammalian CRISPs are known to be involved in the process of reproduction, whereas some of the CRISPs from reptiles are neurotoxin-like substances found in lizard saliva or snake venom. Human CRISP-3 is present in exocrine secretions and in secretory granules of neutrophilic granulocytes and is believed to play a role in innate immunity. On the basis of the relatively high content of CRISP-3 in human plasma and the small size of the protein (28 kDa), we hypothesized that CRISP-3 in plasma was bound to another component. This was supported by size-exclusion chromatography and immunoprecipitation of plasma proteins. The binding partner was identified by mass spectrometry as alpha(1)B-glycoprotein (A1BG), which is a known plasma protein of unknown function and a member of the immunoglobulin superfamily. We demonstrate that CRISP-3 is a specific and high-affinity ligand of A1BG with a dissociation constant in the nanomolar range as evidenced by surface plasmon resonance. The A1BG-CRISP-3 complex is noncovalent with a 1:1 stoichiometry and is held together by strong electrostatic forces. Similar complexes have been described between toxins from snake venom and A1BG-like plasma proteins from opossum species. In these cases, complex formation inhibits the toxic effect of snake venom metalloproteinases or myotoxins and protects the animal from envenomation. We suggest that the A1BG-CRISP-3 complex displays a similar function in protecting the circulation from a potentially harmful effect of free CRISP-3.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
12877-86
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Cysteine-rich secretory protein 3 is a ligand of alpha1B-glycoprotein in human plasma.
pubmed:affiliation
Granulocyte Research Laboratory, Department of Hematology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark. l.udby@rh.dk
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't