TOKYO, Aug 7 (Reuters) - Japanese shares ended lower on Friday as Sino-U.S. tensions heightened following a U.S. ban on transactions with China's tech firms, while a raft of lacklustre domestic earnings and caution ahead of key U.S. jobs data also weighed.

The benchmark Nikkei share average fell 0.39% to 22,329.94.

Tokyo shares tracked China and Hong Kong stocks lower in the afternoon, as the Trump administration unveiled bans on U.S. transactions with ByteDance's TikTok and Tencent-owned WeChat, stoking fears that a "silicon curtain" is emerging between the two superpowers.

Japan stock markets will be closed on Monday for a public holiday.

U.S. non-farm payroll due later in the day is widely expected to show that jobs creation in the United States slowed in July from the prior month, indicating a resurgence in COVID-19 infections is undermining the world's largest economy.

SUMCO Corp, which produces equipment for making semiconductors, slid 8.97% after reporting a 26.8% decline in its January-September net profit.

SUMCO's fall pulled down peer Advantest Corp by 4.77%, while Screen Holdings Co Ltd lost 3.05%.

Shiseido Co Ltd slumped 8.64% after the cosmetics firm forecast a net loss and lower dividend for the full year.

Some analysts argue that the decline in corporate profit has bottomed out and earnings will gradually recover, as game and electronic commerce industries saw a surge in demand from people staying indoors during the lockdown.

Nintendo Co Ltd rose 2.58% after posting a five-fold jump in quarterly profit.

Square Enix Holdings Co Ltd spiked 12.4% and marked a record high after the gaming company posted a 241.4% increase in its operating profit for the three-month period ended June 2020.

Mercari Inc also jumped 10.94% to its highest level since June 2018, as the flea market app operator logged a better-than-expected operating loss for the year ended June 30.

The broader Topix lost 0.2% to 1,546.74.

($1 = 105.5500 yen) (Reporting by Eimi Yamamitsu; Editing by Rashmi Aich and Sherry Jacob-Phillips)