Catalyzes the specific attachment of an amino acid to its cognate tRNA in a 2 step reaction: the amino acid (AA) is first activated by ATP to form AA-AMP and then transferred to the acceptor end of the tRNA (PubMed:6315704). When secreted, acts as a signaling molecule that induces immune response through the activation of monocyte/macrophages (By similarity). Catalyzes the synthesis of the signaling molecule diadenosine tetraphosphate (Ap4A), and thereby mediates disruption of the complex between HINT1 and MITF and the concomitant activation of MITF transcriptional activity (PubMed:3988754, PubMed:2995387, PubMed:19524539).

Belongs to the class-II aminoacyl-tRNA synthetase family.

626 amino acids

MLMQAAVRLVRGSLRQTSWAEWGQRELRLGQLAPFTTLRKDKPLSDRRSELKRRLKAEKKLAEKEAKQKELSEKQLNQTTAAAATNHTADNGVGAEEETLDPNQYYKIRSQAVQQLKVSGEDPYPHKFHVDISLTQFIQEYSHLQPGDHLTDITLKVAGRIHAKRASGGKLIFYDLRGEGVKLQVMANSRNYKSEEEFVHINNKLRRGDIIGVEGNPGKTKKGELSIVPREMTLLSPCLHMLPHLHFGLKDKETRYRQRYLDLILNDFVRQKFIIRSKIITYIRSFLDELGFLEIETPMMNIIPGGAVAKPFITYHNELDMNLYMRIAPELYHKMLVVGGIDRVYEIGRQFRNEGIDLTHNPEFTTCEFYMAYADYHDLMEITEKMLSGMVRSITGSYKITYHPDGPEGQAYEIDFTPPFRRISMVEELEKVLGVKLPETSLFETEETRKILDDICVARAVECPPPRTTARLLDKLVGEFLEVTCISPTFICDHPQIMSPLAKWHRCKEGLTERFELFVMKKEICNAYTELNDPVRQRQLFEEQAKAKAAGDDEAMFIDENFCTALEYGLPPTAGWGMGIDRVTMFLTDSNNIKEVLLFPAMKPEDKKETATATETPESTEASPSV

71.6 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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