Specifically methylates position 2 of adenine 2503 in 23S rRNA (By similarity). 23S rRNA m2A2503 methyltransferase RLMN_VIBCH MTTEKINLLDFDRKGLRTFFAEELGEKAFRAEQVMKWIYHFGCDDFDQMNNINKQLREKLKAKCEIRAPYVSEAQHSADGTIKWAMRVGDQDVETVYIPEDDRATLCVSSQVGCALECKFCSTAQQGFNRNLRVSEIIGQVWRAAREIGLEKETGRRPITNVVMMGMGEPLLNMKNLIPALEIMLDDLGFGLSKRRVTVSTSGVVSGLEQMIGQIDVALAISLHAPNDKLRSEIMPINDRWNIEAFLEVVRRYIASSNANRGKVTVEYVLLDHVNDGTEHAHELAELLKGTPCKINLIPFNPYPGSPYKKPSNSRIDRFQKTLMQYEHTVTIRKTRGDDIDAACGQLVGDVIDRTKRTKAKQFDGQAIPVKTL Ribosomal RNA large subunit methyltransferase N VC_0757 373 rlmN