Chain A ( E347 G355 R356 I375 S376 N377 E378 E379 G380 Y381 R382 H383 I384 F396 T398 K399 G400 T401 W402 E403 V404 S419 N420 E421 G424 M425 P426 G427 G428 R429 L514 D515 F516 I517 I518 L519 T522 K523 F524 W525 Y526 Y547 A548 G549 P550 C551 S552 Q553 K554 A555 D556 T557 F578 D579 G580 R581 G582 S583 G584 Y585 Q586 G587 D588 K589 I590 M591 H592 A593 D605 )