(Reuters) - Wall Street's main indexes opened marginally lower on Tuesday, as investors refrained from risk taking in the lead-up to the release of minutes from the Federal Reserve's latest meet and Chair Jerome Powell's speech at Jackson Hole later this week.

The Dow Jones Industrial Average fell 22.0 points, or 0.05%, at the open to 40,874.52. The S&P 500 fell 5.4 points, or 0.10%, at the open to 5,602.88​, while the Nasdaq Composite dropped 27.7 points, or 0.15%, to 17,849.087 at the opening bell.

(Reporting by Shashwat Chauhan in Bengaluru; Editing by Shinjini Ganguli)