Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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Steps in this page are using Scenario below, it might be vary depend on your setup
Only users from "Team Lead" group are allow to CLOSE an issue with Issue Type is Bug
Currently, JIRA is not able to set permission scheme based on issue type. It is a improvement request being filed in JRA-5865 - Getting issue details... STATUS . So if we want to allow only certain users to perform a certain transition on specific issue type. It is not possible, however we can achieve this by using Issue Type Workflow Scheme.
For example, if we want to allow only Team Lead to close bug and improvement request in Project A, we can do the follow setup.
After that, only users from Team lead group/role are allow to close bug and improvement request, while other issue types are not affected.