Steve Mullings, Michael Frater and Asafa Powell were the other three members of the victorious team.
Former 100m world-record Asafa Powell and Warren Weir in the 200m complete the Jamaican line-up for the individual sprint disciplines.
At least one from Bolt, Gay or former world record-holder Asafa Powell will be scheduled to run at every Diamond League meeting.
In London, Bolt will be running against compatriot and former world record-holder Asafa Powell in the 100m, and with him in the relay.
The 2004 Olympic champion Justin Gatlin, also from the U.S., is returning after a doping ban while fellow Jamaican Asafa Powell once held the world record himself.
Former 100-meter world record-holder Asafa Powell tweeted about Steenkamp's death.
In Bolt's absence, Jamaican team-mates Asafa Powell and Omar Brown won the sprint events in Melbourne, though the winning times of 10.03 seconds and 20.47 do not bear comparison to Bolt's records of 9.58 and 19.19.
Simeon Williamson, coached by Cowan and fresh from a spell training with Asafa Powell, cruised to victory with a PB of 6.53 seconds and the 23-year-old could be the one to lead Britain's sprinting charge to 2012.
Lemaitre became the first white man to run under 10 seconds when he clocked 9.98 seconds in Valence earlier this month, and at 21 has already run faster than both Asafa Powell and Carl Lewis at the same age.
The Jamaican team seemed to show no concern that regular anchor Asafa Powell was missing through injury, as they eased up through the gears and ensured some perfect baton changes to keep in their destiny in their own hands.
In the absence of the world's three fastest men - world and Olympic outdoors champion Usain Bolt, American Tyson Gay and Jamaican Asafa Powell - the United States team would have hoped for high podium positions for Williams and compatriot Michael Rodgers.
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