MASTR Adjustable Rate Mortgages Trust 2006-1 Sample Contracts

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC., Depositor UBS REAL ESTATE SECURITIES INC., Transferor WELLS FARGO BANK, N.A., Master Servicer, Trust Administrator and Custodian CLAYTON FIXED INCOME SERVICES INC., Credit Risk Manager

Pooling and Servicing Agreement • November 2nd, 2006 • MASTR Adjustable Rate Mortgages Trust 2006-Oa1 • Asset-backed securities • New York

• Contract Type
  Pooling and Servicing Agreement
• Filed
  November 2nd, 2006
• Company
  MASTR Adjustable Rate Mortgages Trust 2006-Oa1
• Industry
  Asset-backed securities
• Jurisdiction
  New York

ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

Assignment, Assumption and Recognition Agreement • May 5th, 2006 • MASTR Adjustable Rate Mortgages Trust 2006-1 • Asset-backed securities • New York

• Contract Type
  Assignment, Assumption and Recognition Agreement
• Filed
  May 5th, 2006
• Company
  MASTR Adjustable Rate Mortgages Trust 2006-1
• Industry
  Asset-backed securities
• Jurisdiction
  New York

THIS ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT (this “Agreement”), dated as of April 20, 2006, among UBS Real Estate Securities Inc. (the “Assignor”), Mortgage Asset Securitization Transactions, Inc. (the “Assignee”), American Home Mortgage Corp. (the “Company”) and American Home Mortgage Servicing, Inc. (the “Servicer”):

MORTGAGE LOAN PURCHASE AGREEMENT

Mortgage Loan Purchase Agreement • May 5th, 2006 • MASTR Adjustable Rate Mortgages Trust 2006-1 • Asset-backed securities • New York

• Contract Type
  Mortgage Loan Purchase Agreement
• Filed
  May 5th, 2006
• Company
  MASTR Adjustable Rate Mortgages Trust 2006-1
• Industry
  Asset-backed securities
• Jurisdiction
  New York

This Mortgage Loan Purchase Agreement (the “Agreement”), dated as of March 1, 2006, is between Mortgage Asset Securitization Transactions, Inc., a Delaware corporation (the “Company”), and UBS Real Estate Securities Inc., a Delaware corporation (the “Seller” or “UBSRES”).