The mass-energy equivalence, first established by Einstein is an important and highly discussed phenomenon in physics. Without claiming much knowledge about high-end discussions on this topic, I would like to ask a question on this.
Does the equivalence allow "energy" to exhibit gravitational interactions with other masses and energy?
Furthermore, how can an intangible thing like energy be localized in space which is necessary, atleast according to the classical view, for gravity? This could help solve a related question that
does a matter-annihilation event between two particles also ceases the gravitational effect the original particles might be having on adjacent (and far-off) particles?