Identification of soldier caste-specific protein in the frontal gland of nasute termite Nasutitermes takasagoensis (Isoptera: Termitidae).

Abstract:

:The termite soldier is unique because of its defensive task in a colony. In Nasutitermitinae (family Termitidae), soldiers use in their defense frontal glands, which contain various chemical substances. To isolate the gene products related to the chemical defense, we compared the sodium dodecyl sulfate-polyacrylamide gel electrophoresis protein profiles of soldier heads with those of workers of the nasute termite Nasutitermes takasagoensis. We identified a 26-kDa soldier-specific protein (Ntsp1) that exists most abundantly in the dorsal head including the frontal gland. We determined the N-terminal amino acid sequence of Ntsp1, and then cloned the Ntsp1 cDNA by rapid amplification of the cDNA ends-polymerase chain reaction (RACE-PCR). A putative signal peptide was detected upstream of the N-terminus and the Ntsp1 protein showed sequence homologies with known insect secretory carrier proteins, which bind to hydrophobic ligands such as juvenile hormone, suggesting that Ntsp1 belongs to this class of proteins. Northern blot analysis confirmed that the expression level of Ntsp1 was high only in the soldier head. In addition, the localization of Ntsp1 expression was limited in epithelial cells of the frontal gland reservoir, suggesting that this protein binds to some terpenoid(s) preserved in the frontal gland reservoir.

authors

Hojo M,Morioka M,Matsumoto T,Miura T

doi

10.1016/j.ibmb.2005.01.007

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

347-54

issue

4

eissn

0965-1748

issn

1879-0240

pii

S0965-1748(05)00011-1

journal_volume

35

pub_type

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