* Tax authority puts sale injunction on 3 Dogan Yayin units
* Equities stay above 50,000 mark
* Investors looking to data later in week
(Adds closing prices, quote)
ISTANBUL, Oct 13 (Reuters) - The Turkish lira traded slightly stronger to the dollar on Tuesday while equities fell following news that Turkish tax authorities had rejected collateral offered by Dogan Yayin for a fine.
The media group announced late on Monday the tax office placed a preliminary injunction on the sale of shares in three of its units in a dispute over a record tax fine.
Shares in Dogan Yayin closed the day 7.08 percent lower at 1.05 lira.
The ISE index as a whole traded 1.83 percent weaker at 50,071.55 points, but remaining above the psychologically important 50,000 mark. The MSCI index of emerging markets was down 0.14 percent.
"There were some outflows from banks today, which overall may slow down this week's upward momentum," said Acar Invest head of research Zeynel Abidin Balci.
Top traded Garanti Bank closed the day 3.15 percent down at 6.15 lira, down further than the banking index which ended the day down 2.97 percent.
Analysts also said that going forward investors would be watching data expected this week, including a central bank interest rate decision.
The central bank is expected to cut its benchmark borrowing rate by 50 basis points at its monetary policy committee meeting on Thursday to a new record low of 6.75 percent, a Reuters poll of 19 economists showed.
The bank has cut rates by a total of 950 basis points since November last year in a push to stimulate the economy, which saw a record contraction of 14 percent in the first quarter.
The yield on the benchmark Aug 3, 2011, benchmark bond rose to 8.13 percent, from Monday's close of 8.02 percent. The lira closed at 1.4570 against the dollar on the interbank market, compared with a close on Monday of 1.4610. (Reporting by Alexandra Hudson and Ebru Tuncay; Editing by Ron Askew)