** Shares in Portugal's largest builder Mota-Engil rise 6.4 pct in heavy turnover.
** Traders cite media reports that Mota won a tourism development contract in Mexico worth $1.5 bln, jointly with local partners.
** Company officials have not replied to request for comment.
** Portuguese government and trade delegation, including Mota-Engil chairman of the board, Antonio Mota, is in Mexico. (Reuters messaging rm://firstname.lastname@example.org)