You can achieve this in Informatica IICS using Expression transformation. Try using this logic:

REPLACESTR(1, SUBSTR(your_field, 1, LENGTH(your_field) - INSTR(REVERSE(your_field), ' ')), ' ', '' ) || '.' || SUBSTR(your_field, LENGTH(your_field) - INSTR(REVERSE(your_field), ' ') + 2)