Novel excitatory neuropeptides isolated from a prosobranch gastropod, Thais clavigera : The molluscan counterpart of the annelidan GGNG peptides

Morishita Fumihiro

Minakata Hiroyuki

Takeshige K.

Furukawa Yasuo

Takata T.

Matsushima Osamu

Mukai S.T.

Saleuddin A.S.M.

Horiguchi Toshihiro

Peptides

The GGNG peptides are excitatory neuropeptides identified from earthworms, leeches and polychaeta. Two structurally related peptides were purified and characterized from a mollusk, Thais clavigera (prosobranch gastropod). The peptides designated as TEP-1 (Thais excitatory peptide-1) (KCSGKWAIHACWGGN-NH2) and TEP-2 (KCYGKWAMHACWGGN-NH2) are pentadecapeptides having one disulfide bond and C-terminal GGN-NH2 structures, which are shared by most GGNG peptides. TEP augmented the motilities of Thais esophagus and penial complex. TEP-like immunoreactivity is distributed in both the neurons of the central nervous system and nerve endings in the penial complex. Thus, the involvement of TEP in the contraction of the digestive and reproductive systems is suggested. Substitution of amino acids in TEP revealed that two tryptophan residues in TEP are important for maintaining bioactivity.

HPLC

purification

reproduction

imposex

organotin

Biology [ 460 ]

eng

Elsevier

Copyright (c) 2006 Elsevier Ltd.

[ISSN] 0196-9781

[DOI] 10.1016/j.peptides.2005.06.026

[NCID] AA10617807

[PMID] 16309789

[DOI] http://dx.doi.org/10.1016/j.peptides.2005.06.026 isVersionOf