Wall Street’s push into the mortgage origination market continued in earnest this week, with Deutsche Bank’s announcement of an agreement to purchase New York-based wholesaler MortgageIT. Deutsche Bank said it would pay close to $429 million for the MortgageIT platform, which originates prime and Alt A loans through 50 branches around the country. Until recently, MortgageIT was also active in the subprime market, but the company exited that business in January because of profitability…