Isolated histidyl-tRNA synthetase splice variant polynucleotides and polypeptides having non-canonical biological activities are provided, as well as compositions and methods related thereto.

The present invention provides histidyl-tRNA synthetase and Fc region conjugate polypeptides (HRS-Fc conjugates), such as HRS-Fc fusion polypeptides, compositions comprising the same, and methods of using such conjugates and compositions for treating or diagnosing a variety of conditions. The HRS-Fc conjugates of the invention have improved controlled release properties, stability, half-life, and other pharmacokinetic and biological properties relative to corresponding, unmodified HRS polypeptides.

Reagents and methods for the digital analysis of proteins or peptides are provided. Specifically provided herein are proteins for identifying the N-terminal amino acid or N-terminal phosphorylated amino acid of a polypeptide. Also, an enzyme for use in the cleavage step of the Edman degradation reaction and a method for using this enzyme are described.

Provided are compositions comprising newly identified protein fragments of aminoacyl-tRNA synthetases, polynucleotides that encode them and complements thereof, related agents, and methods of use thereof in diagnostic, drug discovery, research, and therapeutic applications.

Inflammatory and other cellular response-modulating compositions are provided comprising aminoacyl-tRNA synthetase polypeptides, including active fragments and/or variants thereof. Also provided are methods of using such compositions in the treatment of conditions that benefit from the modulation of inflammation, such as inflammatory diseases or conditions.

The present invention provides histidyl-tRNA synthetase and Fc region conjugate polypeptides (HRS-Fc conjugates), such as HRS-Fc fusion polypeptides, compositions comprising the same, and methods of using such conjugates and compositions for treating or diagnosing a variety of conditions. The HRS-Fc conjugates of the invention have improved controlled release properties, stability, half-life, and other pharmacokinetic and biological properties relative to corresponding, unmodified HRS polypeptides.

Reagents and methods for the digital analysis of proteins or peptides are provided. Specifically provided herein are proteins for identifying the N-terminal amino acid or N-terminal phosphorylated amino acid of a polypeptide. Also, an enzyme for use in the cleavage step of the Edman degradation reaction and a method for using this enzyme are described.

Isolated histidyl-tRNA synthetase splice variant polynucleotides and polypeptides having non-canonical biological activities are provided, as well as compositions and methods related thereto.