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NCCRP-1: a novel receptor protein sequenced from teleost nonspecific cytotoxic cells.

Abstract：

:The recognition structure responsible for binding to conventional antigen on target cells has not previously been described for nonspecific cytotoxic cells (NCC) or for mammalian natural killer (NK) cells. Although several biochemical pathways may be available for initiation of the lytic cycle in NCC, evidence presented indicates that initial contact with a tumor cell or protozoan parasite is facilitated by recognition of a target antigen by a membrane protein of Mr 34,000 on NCC (NCC receptor protein, NCCRP-1). Binding to NCCRP-1 by monoclonal antibody 5C6, by target cell antigen or by cognate synthetic peptide initiates a signalling response leading to increased cytotoxicity. In the present study, three 20-mer microsequences were obtained from tryptic digests of purified NCCRP-1. Degenerate primers were synthesized (based on each peptide sequence) and were used for RT-PCR with mRNA purified from homogeneous NCC populations. An NCCRP-1 specific cDNA sequence was used to synthesize nondegenerate primers. These primers were used in a 5'/3' RACE PCR to obtain the entire NCCRP-1 specific cDNA. A deduced aa sequence consisted of 235 aa with a derived molecular weight of 30,628 Da. NCCRP-1 is proline rich (9%), has two glycosylation sites and 18% of all amino acids are potential phosphorylation sites (serine, threonine, tyrosine). The identity of the protein was confirmed by finding the previously microsequenced peptides in the derived sequence. Homology searches revealed that NCCRP-1 is a novel protein. Northern blot analysis of mRNA content from teleost NCC, B-cells and T-cells revealed only one band in NCC preparations. Functional studies demonstrated a decrease in membrane NCCRP-1 expression and inhibition of NCC cytotoxicity following treatment with NCCRP-1 anti-sense oligonucleotides. Treatment of NCC with sense oligonucleotides had no inhibitory effects on cytotoxicity. An algorithm predicting the membrane conformation of NCCRP-1 suggests one extracellular proline-rich domain, a transmembrane portion of 15 18 aa and a cytoplasmic tail composed of a high frequency of phosphorylation sites. Current studies suggest that NCC and NCCRP-1 may participate in innate resistance functions in teleost fish.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Jaso-Friedmann L,Leary JH 3rd,Evans DL

doi

10.1016/s0161-5890(97)00086-2

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

955-65

issue

12-13

eissn

0161-5890

issn

1872-9142

journal_volume

pub_type

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NCCRP-1: a novel receptor protein sequenced from teleost nonspecific cytotoxic cells.