Covalent catalysis involves the substrate forming a transient covalent bond with residues in the active site or with a cofactor.
共价催化涉及底物与活性位点中的残基或与辅因子形成瞬时共价键。
2
Bond insurers such as MBIA and Assured Guaranty, which took hits on mortgage securities they had “wrapped” with credit enhancement, are becoming more active too.