Mumbai, July 29 - Profit booking and a crash at the Chinese bourses pulled down a key index of Indian equities markets 158 points into the red Wednesday.

The 30-scrip benchmark index of the Bombay Stock Exchange (BSE), the Sensex, which opened lower at 15,293.19 points, shut shop at 15,173.46 points -- 158.48 points or 1.03 percent lower than Tuesday's closing figure.

It had slipped more than 443 points around noon after Chinese bourses tanked, but bounced back later. However, selling of shares of metal, realty, power and capital goods resulted in the Sensex closing lower.

Similarly, the S&P CNX Nifty of the National Stock Exchange (NSE) closed in negative terrain, 1.11 percent down at 4,513.5 points.

Broader market indices were also down, with the BSE midcap index ending 0.98 percent lower and the BSE smallcap index moving down 1.46 percent.

The total traded turnover again crossed the Rs.1 lakh crore mark.

The market breadth was positive with 1,089 stocks advancing, 1,558 declining and 77 remaining unchanged.

Among the gainers on the Sensex were TCS, up 4.18 percent at Rs.499.80; Tata Power, up 2.91 percent at Rs.1,302.45; M&M, up 2.