title: Four novel PYFs: members of NPY/PP peptide superfamily from the eyestalk of the giant tiger prawn Penaeus monodon.
abstract: An immunocytochemical method was used for localization of pancreatic polypeptide (PP) immunoreactive substances in the eyestalk of Penaeus monodon using anti-C-terminal hexapeptide of PP (anti-PP6) antiserum. Approximately 200 neuronal cell bodies were recognized in the ganglia between the medulla interna (MI) and medulla terminalis (MT) and surrounding MT in conjunction with the neuronal processes in medulla externa (ME), MI, MT and sinus gland. About half of the PP immunoreactive neurons were also recognized by a combination of three monoclonal antibodies raised against FMRFamide-like peptides. Isolation of the PP immunoreactive substances from the eyestalk was performed using 7500 eyestalks extracted in methanol/acetic acid/water (90/1/9) followed by five to six steps of RP-HPLC separation. Dot-ELISA with anti-PP6 antiserum was used to monitor PP-like substances in various fractions during the purification processes. Four new sequences of one hexapeptide; RARPRFamide, and three nonapeptides; YSQVSRPRFamide, YAIAGRPRFamide and YSLRARPRFamide were identified, and named as Pem-PYF1-4 due to their structural similarity to the PYF found in squid Loligo vulgaris. Each of the new peptides shares four to seven common residues with the C-terminus of the squid PYF and with the NPFs found in other invertebrates. The NPY/PP superfamily as well as the FMRFamide peptide family may be present throughout vertebrates and invertebrates.
authors.affiliation: Department of Biology, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand. paisarn@swu.ac.th
authors.forename: Paisarn
authors.initials: P
authors.lastname: Sithigorngul
authors.forename: Jirasak
authors.initials: J
authors.lastname: Pupuem
authors.forename: Chatchadaporn
authors.initials: C
authors.lastname: Krungkasem
authors.forename: Siwaporn
authors.initials: S
authors.lastname: Longyant
authors.forename: Nanthika
authors.initials: N
authors.lastname: Panchan
authors.forename: Parin
authors.initials: P
authors.lastname: Chaivisuthangkura
authors.forename: Weerawan
authors.initials: W
authors.lastname: Sithigorngul
authors.forename: Amorn
authors.initials: A
authors.lastname: Petsom
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004797:Enzyme-Linked Immunosorbent Assay; D005123:Eye / Q000737:chemistry*; D007150:Immunohistochemistry; D008969:Molecular Sequence Data; D009478:Neuropeptide Y / Q000737:chemistry* / Q000302:isolation & purification; D033561:Penaeidae / Q000737:chemistry*; D017386:Sequence Homology, Amino Acid
chemical_list: D009478:Neuropeptide Y