Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) 3-methylcrotonyl-CoA carboxylase deficiency ?
    ### Response:
    3-methylcrotonyl-CoA carboxylase deficiency (also known as 3-MCC deficiency) is an inherited disorder in which the body is unable to process certain proteins properly. People with this disorder have a shortage of an enzyme that helps break down proteins containing a particular building block (amino acid) called leucine.
    