title: Molecular cloning and characterization of a short type peptidoglycan recognition protein (CfPGRP-S1) cDNA from Zhikong scallop Chlamys farreri.
abstract: Peptidoglycan recognition protein (PGRP) specifically binds to peptidoglycan and plays a crucial role in the innate immune responses as a pattern recognition receptor (PRR). The cDNA of a short type PGRP was cloned from scallop Chlamys farreri (named CfPGRP-S1) by homology cloning with degenerate primers, and confirmed by virtual Northern blots. The full length of CfPGRP-S1 cDNA was 1073 bp in length, including a 5' untranslated region (UTR) of 59 bp, a 3' UTR of 255 bp, and an open reading frame (ORF) of 759 bp encoding a polypeptide of 252 amino acids with an estimated molecular mass of 27.88 kDa and a predicted isoelectric point of 8.69. BLAST analysis revealed that CfPGRP-S1 shared high identities with other known PGRPs. A conserved PGRP domain and three zinc-binding sites were present at its C-terminus. The temporal expression of CfPGRP-S1 gene in healthy, Vibrio anguillarum-challenged and Micrococcus lysodeikticus-challenged scallops was measured by RT-PCR analysis. The expression of CfPGRP-S1 was upregulated initially in the first 12 h or 24 h either by M. lysodeikticus or V. anguillarum challenge and reached the maximum level at 24 h or 36 h, then dropped progressively, and recovered to the original level as the stimulation decreased at 72 h. There was no significant difference between V. anguillarum and M. lysodeikticus challenge. The results indicated that the CfPGRP-S1 was a constitutive and inducible acute-phase protein which was involved in the immune response against bacterial infection.
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, PR China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Su
authors.forename: Duojiao
authors.initials: D
authors.lastname: Ni
authors.forename: Linsheng
authors.initials: L
authors.lastname: Song
authors.forename: Jianmin
authors.initials: J
authors.lastname: Zhao
authors.forename: Limei
authors.initials: L
authors.lastname: Qiu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006434:Hemocytes / Q000378:metabolism / Q000382:microbiology; D008837:Micrococcus / Q000502:physiology; D008969:Molecular Sequence Data; D049897:Pectinidae / Q000235:genetics* / Q000382:microbiology; D010802:Phylogeny; D016415:Sequence Alignment; D013997:Time Factors; D014733:Vibrio / Q000502:physiology
chemical_list: D002352:Carrier Proteins; D018076:DNA, Complementary; C118897:peptidoglycan recognition protein