Isolation and characterization of corticostatic peptides from guinea pig bone marrow.

Abstract:

:Three corticostatic peptides (GP-CS1, GP-CS2 and GP-CS3) were purified from extracts of guinea pig bone marrow. Each was identified on the basis of their ability to inhibit the secretion of corticosterone by isolated rat adrenal cells stimulated by ACTH. GP-CS1 and GP-CS2 were found to be 31 residues in length, rich in arginine and to have six cysteines typical of the corticostatin/defensin family of peptides previously purified from phagocytic cells of the immune system. GP-CS1 was found to be identical to GP-CS2 except for having a leucine at position 21 instead of isoleucine. GP-CS3 was also found to be rich in arginine and cysteine but structurally distinct from the other peptides. A combination of endoprotease mapping, ion-spray mass spectrometry and gas-phase sequencing revealed that GP-CS3 was a novel homo-dimer consisting of two 13 amino acid residue subunits cross-linked through eight cysteines in an anti-parellel configuration.

authors

Hu J,Bennett HP,Lazure C,Solomon S

doi

10.1016/s0006-291x(05)81101-5

subject

Has Abstract

pub_date

1991-10-31 00:00:00

pages

558-65

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)81101-5

journal_volume

180

pub_type

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