PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9573237-5 1998 In contrast, alanine mutations at His-299 (motif II) and at Thr-326 and Thr-328 (motif III) elicited defects in RNA unwinding but spared the ATPase. Threonine 60-63 dynein axonemal heavy chain 8 Homo sapiens 141-147 9573237-5 1998 In contrast, alanine mutations at His-299 (motif II) and at Thr-326 and Thr-328 (motif III) elicited defects in RNA unwinding but spared the ATPase. Threonine 72-75 dynein axonemal heavy chain 8 Homo sapiens 141-147 9573237-7 1998 These findings, together with previous mutational studies, indicate that NPH-II motifs I, Ia, II, and VI (QRxGRxGRxxxG) are essential for nucleoside triphosphate (NTP) hydrolysis, whereas motif III and the His moiety of the DExH-box serve to couple the NTPase and helicase activities. ntp 163-166 inosine triphosphatase Homo sapiens 253-259