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== Publication Abstract from PubMed ==

Acylpeptide hydrolase (APH) catalyzes the N-terminal hydrolysis of Nalpha-acylpeptides to release Nalpha-acylated amino acids. The crystal structure of recombinant APH from the thermophilic archaeon Aeropyrum pernix K1 (apAPH) was reported recently to be at a resolution of 2.1 Angstrom; using X-ray diffraction. A truncated mutant of apAPH that lacks the first short alpha-helix at the N-terminal, apAPH-delta(1-21), was cloned, expressed, characterized and crystallized. Data from biochemical experiments indicate that the optimum temperature of apAPH is decreased by 15 degrees C with the deletion of the N-terminal alpha-helix. However, the enzyme activity at the optimal temperature does not change. It suggests that this N-terminal alpha-helix is essential for thermostability. Here, the crystal structure of apAPH-delta(1-21) has been determined by molecular replacement to 2.5 Angstrom;. A comparison between the two structures suggests a difference in thermostability, and it can be concluded that by adding or deleting a linking structure (located over different domains), the stability or even the activity of an enzyme can be modified.

Expression, purification and crystal structure of a truncated acylpeptide hydrolase from Aeropyrum pernix K1.,Zhang HF, Zheng BS, Peng Y, Lou ZY, Feng Y, Rao ZH Acta Biochim Biophys Sin (Shanghai). 2005 Sep;37(9):613-7. doi: , 10.1111/j.1745-7270.2005.00085.x. PMID:16143816<ref>PMID:16143816</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

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