cDNA cloning of the lysozyme of the white shrimp Penaeus vannamei.
Lysozyme, an antibacterial protein, has been implicated in innate immunity in invertebrates, but its activity in shrimp remained to be determined. We cloned the white shrimp lysozyme cDNA using a PCR strategy and detected its activity in haemocytes using a lytic-zone assay against Micrococcus luteus. The cloning was based on a reported EST (dbEST BE18831). The deduced amino acid sequence resulted in 150 amino with 46% identity to hen egg white lysozyme. RT-PCR was used to detect lysozyme mRNA in haemocytes. Analysis of the amino acid sequence of the shrimp lysozyme showed that it belongs to the C-type family of lysozymes. Furthermore, the lysozyme amino acid sequence contained extra residues at its C-terminus, which are characteristic of marine invertebrates. This information will be useful in future studies on the molecular mechanisms of immunity in marine invertebrates.
Sotelo-Mundo
Rogerio R
RR
Aquatic Molecular Biology Laboratory, Centro de Investigación en Alimentación y Desarrollo, P.O. Box 1735, Hermosillo, Sonora 83000, Mexico. rrs@cascabel.ciad.mx
Islas-Osuna
Maria A
MA
de-la-Re-Vega
Enrique
E
Hernández-López
Jorge
J
Vargas-Albores
Francisco
F
Yepiz-Plascencia
Gloria
G
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary / Q000235:genetics*; D015870:Gene Expression; D006434:Hemocytes / Q000378:metabolism; D008969:Molecular Sequence Data; D009113:Muramidase / Q000235:genetics* / Q000378:metabolism; D033561:Penaeidae / Q000235:genetics* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction
D017931:DNA Primers; D018076:DNA, Complementary; D009113:Muramidase