By Tanya Agrawal
(Reuters) - U.S. stock index futures were slightly lower on Tuesday, tracking European markets, as uncertainty lingered regarding the outcome of Greece's negotiations with creditors.
* Greece must repay four loans totaling 1.6 billion euros ($1.8 billion) to the International Monetary Fund this month, starting with a 300 million euro payment on June 5.
* The leaders of Germany, France and Greece's international creditors agreed late on Monday to work with "real intensity" as they try to reach a deal that would prevent Athens from defaulting and potentially leaving the euro zone. [ID:nL5N0YN3O]
* Adding pressure to stock futures, the dollar <.DXY> hit a 12 1/2-year high against the yen in Asian trade before pulling back to trade down against the Japanese currency and the euro.
* Investors will also keep a keen eye on a slew of U.S. economic data due this week for clues regarding the timing of the Federal Reserve's first rate hike in nearly a decade.
* Data due on Tuesday include April factory orders at 10:00 a.m. ET (1400 GMT). Demand for U.S. manufactured goods is likely to be flat after a strong showing in March.
* The U.S. auto industry will report industry sales for May and analysts expect demand to be flat or down slightly from last year. That data is expected at 1:30 p.m. ET.
* Plug Power
* Youku Tudou's
Futures snapshot at 7:12 a.m. ET:
* S&P 500 e-minis
* Nasdaq 100 e-minis
* Dow e-minis <1YMc1> were down 8 points, or 0.04 percent, with 39,315 contracts changing hands.
(Editing by Savio D'Souza)
