Missouri's Aldon Smith hopes to be early contributor for 49ers

Wednesday, August 3, 2011 | 10:33 p.m. CDT; updated 11:35 a.m. CDT, Thursday, August 4, 2011

SANTA CLARA, Calif. — The San Francisco 49ers are unsettled on defense, and first-round draft pick Aldon Smith is ready to take advantage of the opportunity to make an early impression. He is hoping he can have an immediate impact.