Banks depress Europe stocks, weak euro lifts autos

* FTSEurofirst 300 index .FTEU3 ends down 0.3 percent

* Banks sharply lower on JPMorgan write-downs

* Autos gain ground as euro hit six-week low against dollar

By Patrizia Kokot

LONDON, Aug 12 (Reuters) - European shares ended with losses on Tuesday as the region's financial stocks suffered following further writedowns from the third-largest U.S. bank JPMorgan (JPM.N).

The FTSEurofirst 300 index .FTEU3 of top European shares provisionally closed 0.3 percent lower at 1,208.89, having traded between 1,202.55 and 1,216.40 points.

JPMorgan (JPM.N) traded 6.9 percent lower on Wall Street after it said it had taken another $1.5 billion in writedowns in the current quarter as wider credit spreads, lower levels of liquidity and further disruption in the credit and mortgage markets took their toll.

The DJ Stoxx European banks index .SX7P fell 1.1 percent, with BNP Paribas (BNPP.PA), Deustche Postbank (DPBGn.DE) and Societe Generale (SOGN.PA) all down more than 3 percent. Natixis (CNAT.PA) lost 9.7 percent.

"The market is doubting whether the U.S. rate cuts are having an effect," said strategist Andreas Huerkamp at Commerzbank in Frankfurt.

"The U.S. had a steep yield curve since January, which usually has a positive effect on the equity markets, but now seven months have passed and we are still experiencing negative news in the financial sector," he added.

Swiss bank UBS ended 2.4 percent lower after a rollercoaster session -- its shares rose as much as 4.2 percent and fell as much as 2.9 percent -- after it said it would split its business into three units and named a new CFO after disappointing quarterly results.

However, analysts praised its improved Tier 1 capital ratio as well as its focus on reducing its exposure to risky asset classes.

Merrill Lynch reiterated its "buy" stance on the stock and said it hoped the new strategy would "help insulate the private banking franchise from the problems elsewhere in the bank".

Among insurers, Standard Chartered (SL.L) lost 6.8 percent after Citigroup downgraded the stock to "sell" from "hold", noting that the continued dominance of wholesale versus consumer banking profits was expected to weigh on group returns.

Reinsurer Munich Re (MUVGn.DE) lost 0.8 percent on the back of a report in Focus Money magazine that said the group could face 2.7 billion euros in writedowns in the second half unless capital markets changed.